{"id":479240,"date":"2026-05-10T15:45:37","date_gmt":"2026-05-10T15:45:37","guid":{"rendered":"https:\/\/savepearlharbor.com\/?p=479240"},"modified":"-0001-11-30T00:00:00","modified_gmt":"-0001-11-29T21:00:00","slug":"","status":"publish","type":"post","link":"https:\/\/savepearlharbor.com\/?p=479240","title":{"rendered":"\u0413\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u044f \u0442\u0438\u043f\u043e\u0432 \u0432 Runtime"},"content":{"rendered":"
\n

\u0418\u043d\u043e\u0433\u0434\u0430 \u0432 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u0432\u043e\u0437\u043d\u0438\u043a\u0430\u044e\u0442 \u0437\u0430\u0434\u0430\u0447\u0438, \u0442\u0440\u0435\u0431\u0443\u044e\u0449\u0438\u0435 \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u0442\u0438\u043f\u043e\u0432 \u0432 \u0440\u0430\u043d\u0442\u0430\u0439\u043c\u0435. \u0427\u0430\u0449\u0435 \u0432\u0441\u0435\u0433\u043e \u044d\u0442\u043e \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u043e \u043f\u0440\u0438 \u043d\u0430\u043f\u0438\u0441\u0430\u043d\u0438\u0438 \u0434\u0435\u043a\u043b\u0430\u0440\u0430\u0442\u0438\u0432\u043d\u044b\u0445 \u0441\u0435\u0440\u0432\u0438\u0441\u043e\u0432, \u0432\u044b\u0441\u043e\u043a\u043e\u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0445 \u043c\u0430\u043f\u043f\u0435\u0440\u043e\u0432 \u0438\u043b\u0438 \u0441\u0438\u0441\u0442\u0435\u043c \u0441 \u0434\u0438\u043d\u0430\u043c\u0438\u0447\u0435\u0441\u043a\u0438\u043c \u043f\u0440\u043e\u043a\u0441\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435\u043c.<\/p>\n

\u0414\u043e\u043f\u0443\u0441\u0442\u0438\u043c, \u043c\u044b \u0445\u043e\u0442\u0438\u043c \u0441\u0433\u0435\u043d\u0435\u0440\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0442\u0438\u043f \u0441 \u0442\u0430\u043a\u0438\u043c \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441\u043e\u043c:<\/p>\n

public interface IStudent{    string Name { get; set; }    int Some(string value);}<\/code>
<\/a><\/div><\/pre>\n
\u041b\u043e\u0433\u0438\u043a\u0430 \u043c\u0435\u0442\u043e\u0434\u0430 Some<\/code> (\u043f\u0440\u043e\u0441\u0442\u043e \u0434\u043b\u044f \u043f\u0440\u0438\u043c\u0435\u0440\u0430):<\/p>\n
public int Some(string value){    string str = Name + value;    Console.WriteLine(str);    return str.Length;}<\/code>
<\/a><\/div><\/pre>\n
Reflection.Emit<\/h3>\n
\u041c\u043e\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c System.Reflection.Emit<\/code>.<\/p>\n
\/\/ 1. \u0421\u043e\u0437\u0434\u0430\u0435\u043c \u0441\u0431\u043e\u0440\u043a\u0443, \u043c\u043e\u0434\u0443\u043b\u044c \u0438 \u0442\u0438\u043fAssemblyBuilder assemblyBuilder = AssemblyBuilder.DefineDynamicAssembly(new AssemblyName(\"StudentReflectionEmitAssembly\"), AssemblyBuilderAccess.Run);ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule(\"StudentReflectionEmitModule\");TypeBuilder typeBuilder = moduleBuilder.DefineType(\"Student\", TypeAttributes.Public | TypeAttributes.Class | TypeAttributes.Serializable, typeof(object), new[] { typeof(IStudent) });\/\/ 2. \u041e\u0431\u044a\u044f\u0432\u043b\u044f\u0435\u043c backing-\u043f\u043e\u043b\u0435 \u0438 \u0441\u0432\u043e\u0439\u0441\u0442\u0432\u043eFieldBuilder nameField = typeBuilder.DefineField(\"_name\", typeof(string), FieldAttributes.Private);PropertyBuilder nameProperty = typeBuilder.DefineProperty(\"Name\", PropertyAttributes.None, typeof(string), Type.EmptyTypes);\/\/ 3. \u0421\u043e\u0437\u0434\u0430\u0435\u043c \u0441\u0435\u0442\u0442\u0435\u0440\u044b, \u0433\u0435\u0442\u0442\u0435\u0440\u044b \u0438 \u043c\u0435\u0442\u043e\u0434MethodBuilder getter = typeBuilder.DefineMethod(\"get_Name\", MethodAttributes.Public | MethodAttributes.Virtual | MethodAttributes.HideBySig | MethodAttributes.SpecialName | MethodAttributes.NewSlot | MethodAttributes.Final, typeof(string), Type.EmptyTypes);MethodBuilder setter = typeBuilder.DefineMethod(\"set_Name\", MethodAttributes.Public | MethodAttributes.Virtual | MethodAttributes.HideBySig | MethodAttributes.SpecialName | MethodAttributes.NewSlot | MethodAttributes.Final, typeof(void), new[] { typeof(string) });MethodBuilder someMethod = typeBuilder.DefineMethod(\"Some\", MethodAttributes.Public | MethodAttributes.Virtual | MethodAttributes.HideBySig | MethodAttributes.NewSlot | MethodAttributes.Final, typeof(int), new[] { typeof(string) });\/\/ 4. \u041f\u0438\u0448\u0435\u043c \u043b\u043e\u0433\u0438\u043a\u0443 \u0441\u0432\u043e\u0439\u0441\u0442\u0432ILGenerator getterIl = getter.GetILGenerator();getterIl.Emit(OpCodes.Ldarg_0);getterIl.Emit(OpCodes.Ldfld, nameField);getterIl.Emit(OpCodes.Ret);nameProperty.SetGetMethod(getter);ILGenerator setterIl = setter.GetILGenerator();setterIl.Emit(OpCodes.Ldarg_0);setterIl.Emit(OpCodes.Ldarg_1);setterIl.Emit(OpCodes.Stfld, nameField);setterIl.Emit(OpCodes.Ret);nameProperty.SetSetMethod(setter);\/\/ 5. \u041f\u0438\u0448\u0435\u043c \u043b\u043e\u0433\u0438\u043a\u0443 \u043c\u0435\u0442\u043e\u0434\u0430 SomeILGenerator someIl = someMethod.GetILGenerator();LocalBuilder str = someIl.DeclareLocal(typeof(string));someIl.Emit(OpCodes.Ldarg_0);someIl.Emit(OpCodes.Call, getter);someIl.Emit(OpCodes.Ldarg_1);someIl.Emit(OpCodes.Call, typeof(string).GetMethod(nameof(string.Concat), new[] { typeof(string), typeof(string) }));someIl.Emit(OpCodes.Stloc, str);someIl.Emit(OpCodes.Ldloc, str);someIl.Emit(OpCodes.Call, typeof(Console).GetMethod(nameof(Console.WriteLine), new[] { typeof(string) }));someIl.Emit(OpCodes.Ldloc, str);someIl.Emit(OpCodes.Call, typeof(string).GetProperty(nameof(string.Length)).GetGetMethod());someIl.Emit(OpCodes.Ret);\/\/ 6. \u0424\u0438\u043d\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f \u0442\u0438\u043f\u0430typeBuilder.DefineDefaultConstructor(MethodAttributes.Public);Type studentType = typeBuilder.CreateTypeInfo().AsType();<\/code>
<\/a><\/div><\/pre>\n
\u041f\u043e\u043b\u0443\u0447\u0438\u043b\u0441\u044f \u043c\u043d\u043e\u0433\u043e\u0441\u043b\u043e\u0432\u043d\u044b\u0439 \u043a\u043e\u0434. \u0425\u043e\u0442\u044f \u043e\u043d \u043e\u0447\u0435\u043d\u044c \u0448\u0430\u0431\u043b\u043e\u043d\u043d\u044b\u0439, \u043c\u043e\u0436\u043d\u043e \u043d\u0430\u043f\u0438\u0441\u0430\u0442\u044c \u043d\u0435\u0431\u043e\u043b\u044c\u0448\u0443\u044e \u043e\u0431\u0435\u0440\u0442\u043a\u0443 \u0438 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c:<\/p>\n
AssemblyFactory<\/h3>\n
\u042d\u0442\u043e \u043f\u043e\u0437\u0432\u043e\u043b\u0438\u0442 \u043e\u043f\u0438\u0441\u044b\u0432\u0430\u0442\u044c \u0442\u0438\u043f\u044b \u0432 \u0434\u0435\u043a\u043b\u0430\u0440\u0430\u0442\u0438\u0432\u043d\u043e\u043c \u0441\u0442\u0438\u043b\u0435:<\/p>\n
Type studentType = AssemblyFactory.CreateAssembly(\"StudentReflectionEmitAssembly\")    .CreateClass(\"Student\", typeof(object), new[] { typeof(IStudent) })    .AddProperty(typeof(string), nameof(IStudent.Name))    .AddMethod(typeof(int), nameof(IStudent.Some), new[] { typeof(string) }, (ilGenerator, typeBuilder) =>    {        LocalBuilder str = ilGenerator.DeclareLocal(typeof(string));        ilGenerator.Emit(OpCodes.Ldarg_0);        ilGenerator.Emit(OpCodes.Call, typeBuilder.GetProperty(nameof(IStudent.Name)).GetGetMethod());        ilGenerator.Emit(OpCodes.Ldarg_1);        ilGenerator.Emit(OpCodes.Call, typeof(string).GetMethod(nameof(string.Concat), new[] { typeof(string), typeof(string) }));        ilGenerator.Emit(OpCodes.Stloc, str);        ilGenerator.Emit(OpCodes.Ldloc, str);        ilGenerator.Emit(OpCodes.Call, typeof(Console).GetMethod(nameof(Console.WriteLine), new[] { typeof(string) }));        ilGenerator.Emit(OpCodes.Ldloc, str);        ilGenerator.Emit(OpCodes.Call, typeof(string).GetProperty(nameof(string.Length)).GetGetMethod());        ilGenerator.Emit(OpCodes.Ret);    })    .Build();<\/code>
<\/a><\/div><\/pre>\n
\u0414\u043b\u044f \u044d\u0442\u043e\u0433\u043e \u043d\u0430\u043f\u0438\u0448\u0435\u043c \u0444\u0430\u0431\u0440\u0438\u043a\u0443:<\/p>\n
private class AssemblyFactory{    \/\/ \u0421\u043e\u0437\u0434\u0430\u0435\u0442 \u0441\u0431\u043e\u0440\u043a\u0443    public static AssemblyFactory CreateAssembly(string name)    {        AssemblyBuilder assemblyBuilder = AssemblyBuilder.DefineDynamicAssembly(new AssemblyName(name), AssemblyBuilderAccess.Run);        ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule(name);        return new AssemblyFactory(moduleBuilder);    }    private readonly ModuleBuilder moduleBuilder;    private AssemblyFactory(ModuleBuilder moduleBuilder)    {        this.moduleBuilder = moduleBuilder;    }    \/\/ \u0421\u043e\u0437\u0434\u0430\u0435\u0442 \u043a\u043b\u0430\u0441\u0441 \u0432 \u0441\u0431\u043e\u0440\u043a\u0435    public DynamicTypeBuilder CreateClass(string name, Type baseType, Type[] interfaces)    {        TypeBuilder typeBuilder = moduleBuilder.DefineType(name, TypeAttributes.Public | TypeAttributes.Class | TypeAttributes.Serializable, baseType, interfaces);        return new DynamicTypeBuilder(typeBuilder);    }}<\/code>
<\/a><\/div><\/pre>\n
\u0418 \u0431\u0438\u043b\u0434\u0435\u0440 \u043a\u043b\u0430\u0441\u0441\u043e\u0432:<\/p>\n
private sealed class DynamicTypeBuilder(TypeBuilder typeBuilder){    \/\/ \u0442\u0435 \u0436\u0435 \u0430\u0442\u0440\u0438\u0431\u0443\u0442\u044b, \u0447\u0442\u043e \u0438 \u0440\u0430\u043d\u044c\u0448\u0435    private const MethodAttributes DefaultMethodAttributes = MethodAttributes.Public | MethodAttributes.Virtual | MethodAttributes.HideBySig | MethodAttributes.NewSlot | MethodAttributes.Final;    private const MethodAttributes PropertyMethodAttributes = DefaultMethodAttributes | MethodAttributes.SpecialName;    \/\/ \u0441\u043e\u0445\u0440\u0430\u043d\u044f\u0435\u043c \u043f\u043e\u043b\u044f \u0438 \u0441\u0432\u043e\u0439\u0441\u0442\u0432\u0430 \u0434\u043b\u044f \u0434\u043e\u0441\u0442\u0443\u043f\u0430    private readonly IDictionary<string, FieldBuilder> fields = new Dictionary<string, FieldBuilder>(StringComparer.Ordinal);    private readonly IDictionary<string, PropertyBuilder> properties = new Dictionary<string, PropertyBuilder>(StringComparer.Ordinal);    \/\/ \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u0435 \u043f\u043e\u043b\u0435\u0439 \u043e\u0447\u0435\u043d\u044c \u043f\u0440\u043e\u0441\u0442\u043e\u0435    public DynamicTypeBuilder AddField(Type type, string name)    {        fields[name] = typeBuilder.DefineField(name, type, FieldAttributes.Public);        return this;    }    \/\/ \u0441\u0432\u043e\u0439\u0441\u0442\u0432\u043e \u0447\u0443\u0442\u044c \u0441\u043b\u043e\u0436\u043d\u0435\u0435, \u043d\u043e \u0442\u0430\u043a \u0436\u0435 \u0432\u0437\u044f\u0442\u043e \u0438\u0437 \u043a\u043e\u0434\u0430 \u0432\u044b\u0448\u0435    public DynamicTypeBuilder AddProperty(Type type, string name)    {        FieldBuilder field = typeBuilder.DefineField($\"_{name}\", type, FieldAttributes.Private);        fields[name] = field;        PropertyBuilder property = typeBuilder.DefineProperty(name, PropertyAttributes.None, type, Type.EmptyTypes);        properties[name] = property;        MethodBuilder getter = typeBuilder.DefineMethod($\"get_{name}\", PropertyMethodAttributes, type, Type.EmptyTypes);        ILGenerator getterIl = getter.GetILGenerator();        getterIl.Emit(OpCodes.Ldarg_0);        getterIl.Emit(OpCodes.Ldfld, field);        getterIl.Emit(OpCodes.Ret);        property.SetGetMethod(getter);        MethodBuilder setter = typeBuilder.DefineMethod($\"set_{name}\", PropertyMethodAttributes, typeof(void), new[] { type });        ILGenerator setterIl = setter.GetILGenerator();        setterIl.Emit(OpCodes.Ldarg_0);        setterIl.Emit(OpCodes.Ldarg_1);        setterIl.Emit(OpCodes.Stfld, field);        setterIl.Emit(OpCodes.Ret);        property.SetSetMethod(setter);        return this;    }    public FieldBuilder GetField(string name)    {        return fields[name];    }    public PropertyBuilder GetProperty(string name)    {        return properties[name];    }    \/\/ \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u0435 \u043c\u0435\u0442\u043e\u0434\u043e\u0432 \u0434\u0435\u043b\u0435\u0433\u0438\u0440\u0443\u0435\u0442\u0441\u044f \u0432\u044b\u0437\u044b\u0432\u0430\u044e\u0449\u0435\u0439 \u0441\u0442\u043e\u0440\u043e\u043d\u0435    public DynamicTypeBuilder AddMethod(Type returnType, string name, Type[] parameterTypes, Action<ILGenerator, DynamicTypeBuilder> emit)    {        MethodBuilder method = typeBuilder.DefineMethod(name, DefaultMethodAttributes, returnType, parameterTypes);        emit(method.GetILGenerator(), this);        return this;    }    \/\/ \u0438 \u0441\u0430\u043c\u043e \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u0435 \u0442\u0438\u043f\u0430    public Type Build()    {        typeBuilder.DefineDefaultConstructor(MethodAttributes.Public);        return typeBuilder.CreateTypeInfo().AsType();    }}<\/code>
<\/a><\/div><\/pre>\n
\u042d\u0442\u043e\u0433\u043e \u0443\u0436\u0435 \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e, \u0447\u0442\u043e\u0431\u044b \u0441\u043e\u0437\u0434\u0430\u0432\u0430\u0442\u044c DTO \u0438 \u043f\u0438\u0441\u0430\u0442\u044c \u043f\u0440\u043e\u0441\u0442\u044b\u0435 \u043c\u0435\u0442\u043e\u0434\u044b, \u043d\u043e \u043f\u0438\u0441\u0430\u0442\u044c IL \u2014 \u043d\u0435 \u0441\u0430\u043c\u043e\u0435 \u043f\u0440\u0438\u044f\u0442\u043d\u043e\u0435 \u0437\u0430\u043d\u044f\u0442\u0438\u0435. \u041d\u0430 \u044d\u0442\u043e\u043c \u043c\u043e\u043c\u0435\u043d\u0442\u0435 \u043d\u0443\u0436\u043d\u043e \u043f\u043e\u0434\u0443\u043c\u0430\u0442\u044c: \u0430 \u0447\u0442\u043e \u043c\u043e\u0436\u0435\u0442 \u0433\u0435\u043d\u0435\u0440\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u043b\u043e\u0433\u0438\u043a\u0443 \u0432 IL?<\/p>\n
Expression Trees<\/h3>\n
\u0421\u043d\u0430\u0447\u0430\u043b\u0430 \u043d\u0443\u0436\u043d\u043e \u0432\u043a\u0440\u0430\u0442\u0446\u0435 \u0440\u0430\u0437\u043e\u0431\u0440\u0430\u0442\u044c\u0441\u044f, \u043a\u0430\u043a \u043e\u043d\u043e \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442. \u0420\u0430\u0431\u043e\u0442\u0430 \u0441 \u043d\u0438\u043c \u0438\u0434\u0435\u0442 \u0447\u0435\u0440\u0435\u0437 \u0441\u0442\u0430\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u043c\u0435\u0442\u043e\u0434\u044b System.Linq.Expressions.Expression<\/code>.<\/p>\n
\u0414\u043e\u043f\u0443\u0441\u0442\u0438\u043c, \u043c\u044b \u0445\u043e\u0442\u0438\u043c \u043f\u043e\u0441\u0442\u0440\u043e\u0438\u0442\u044c \u0434\u0435\u0440\u0435\u0432\u043e \u0434\u043b\u044f (User u) => u.Age >= 18<\/code>.<\/p>\n
\u0414\u043b\u044f \u043f\u043e\u0441\u0442\u0440\u043e\u0435\u043d\u0438\u044f \u0434\u0435\u0440\u0435\u0432\u0430 \u0432\u044b\u0437\u044b\u0432\u0430\u0435\u0442\u0441\u044f \u043c\u0435\u0442\u043e\u0434 Expression.Lambda<\/code>, \u043e\u043d \u043f\u043e\u043b\u0443\u0447\u0430\u0435\u0442 \u0434\u0436\u0435\u043d\u0435\u0440\u0438\u043a \u0434\u0435\u043b\u0435\u0433\u0430\u0442\u0430 Func<><\/code>, Action<><\/code>, \u0442\u0435\u043b\u043e \u0438 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u044b. \u041d\u0443\u0436\u043d\u043e \u0441\u043d\u0430\u0447\u0430\u043b\u0430 \u0441\u043e\u0437\u0434\u0430\u0442\u044c \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u044b \u0447\u0435\u0440\u0435\u0437 Expression.Parameter<\/code> \u0438 \u043f\u0435\u0440\u0435\u0434\u0430\u0442\u044c \u0432 Lambda<\/code>. \u0415\u0441\u043b\u0438 \u0442\u0438\u043f\u044b \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u043e\u0432 \u0438 \u0434\u0435\u043b\u0435\u0433\u0430\u0442\u043e\u0432 \u043d\u0435 \u0441\u043e\u0432\u043f\u0430\u0434\u0430\u044e\u0442 \u2014 \u0431\u0443\u0434\u0435\u0442 \u0432\u044b\u0431\u0440\u043e\u0448\u0435\u043d\u043e \u0438\u0441\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435.<\/p>\n
\/\/ \u0432\u0445\u043e\u0434\u044f\u0449\u0438\u0435 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u044b \u043e\u043f\u0438\u0441\u044b\u0432\u0430\u044e\u0442\u0441\u044f \u043a\u0430\u043a\u043e\u0439 \u0442\u0438\u043f \u0438 \u043a\u0430\u043a\u043e\u0435 \u0438\u043c\u044f (\u0438\u043c\u0435\u043d\u0430 \u043c\u043e\u0433\u0443\u0442 \u043f\u043e\u0432\u0442\u043e\u0440\u044f\u0442\u044c\u0441\u044f \u0438\u043b\u0438 \u0438\u0445 \u043c\u043e\u0436\u0435\u0442 \u043d\u0435 \u0431\u044b\u0442\u044c, \u043e\u043d\u0438 \u043d\u0443\u0436\u043d\u044b \u0432 \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u043c \u0434\u043b\u044f \u043e\u0442\u043b\u0430\u0434\u043a\u0438)ParameterExpression paramUser = Expression.Parameter(typeof(User), \"u\");Expression body = ...;Expression<Predicate<User>> lambda = Expression.Lambda<Predicate<User>>(    body, \/\/ \u0442\u0435\u043b\u043e \u0432\u044b\u0440\u0430\u0436\u0435\u043d\u0438\u044f    paramUser \/\/ \u0438 \u0432\u0445\u043e\u0434\u044f\u0449\u0438\u0435 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u044b \u043f\u0435\u0440\u0435\u0434\u0430\u044e\u0442\u0441\u044f \u0437\u0434\u0435\u0441\u044c);<\/code>
<\/a><\/div><\/pre>\n
\u0422\u0435\u043f\u0435\u0440\u044c \u043d\u0443\u0436\u043d\u043e \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043f\u043e\u043b\u0435 Age<\/code> \u0438 \u0441\u0440\u0430\u0432\u043d\u0438\u0442\u044c \u0435\u0433\u043e \u0441 18.<\/p>\n
\/\/ \u043f\u043e\u043b\u0443\u0447\u0430\u0435\u043c \u043f\u043e\u043b\u0435, \u0441 \u043a\u043e\u0442\u043e\u0440\u044b\u043c \u0445\u043e\u0442\u0438\u043c \u0440\u0430\u0431\u043e\u0442\u0430\u0442\u044cMemberExpression propAge = Expression.PropertyOrField(paramUser, \"Age\");\/\/ \u0441\u043e\u0437\u0434\u0430\u0435\u043c \u043a\u043e\u043d\u0441\u0442\u0430\u043d\u0442\u0443, \u0442\u0430\u043a \u043a\u0430\u043a \u043c\u043e\u0436\u043d\u043e \u0440\u0430\u0431\u043e\u0442\u0430\u0442\u044c \u0442\u043e\u043b\u044c\u043a\u043e \u0441 Expression ConstantExpression const18 = Expression.Constant(18, typeof(int));\/\/ \u0438 \u0434\u0435\u043b\u0430\u0435\u043c \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0443 \u00ab\u0431\u043e\u043b\u044c\u0448\u0435 \u0438\u043b\u0438 \u0440\u0430\u0432\u043d\u043e\u00bb. \u041b\u044e\u0431\u043e\u0435 Expression \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u0442\u0435\u043b\u043e\u043c, \u0432 \u043d\u0430\u0448\u0435\u043c \u0441\u043b\u0443\u0447\u0430\u0435 \u044d\u0442\u043e \u0431\u0443\u0434\u0435\u0442 greaterOrEqualBinaryExpression greaterOrEqual = Expression.GreaterThanOrEqual(propAge, const18);<\/code>
<\/a><\/div><\/pre>\n
\u041f\u043e\u043b\u043d\u044b\u0439 \u043a\u043e\u0434 \u0432\u044b\u0433\u043b\u044f\u0434\u0438\u0442 \u0442\u0430\u043a:<\/p>\n
ParameterExpression paramUser = Expression.Parameter(typeof(User), \"u\");MemberExpression propAge = Expression.PropertyOrField(paramUser, \"Age\");ConstantExpression const18 = Expression.Constant(18, typeof(int));BinaryExpression greaterOrEqual = Expression.GreaterThanOrEqual(propAge, const18);Expression<Predicate<User>> lambda = Expression.Lambda<Predicate<User>>(    greaterOrEqual,    paramUser);\/\/ \u0438 \u043a\u043e\u0433\u0434\u0430 \u0434\u0435\u0440\u0435\u0432\u043e \u0441\u043e\u0431\u0440\u0430\u043d\u043e \u0435\u0433\u043e \u043c\u043e\u0436\u043d\u043e \u0441\u043a\u043e\u043c\u043f\u0438\u043b\u0438\u0440\u043e\u0432\u0430\u0442\u044cPredicate<User> compiled = lambda.Compile();\/\/ \u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044cif (compiled(new User(name: \"Anton\", age: 20))){    Console.WriteLine(\"Hello\");}<\/code>
<\/a><\/div><\/pre>\n
\u041e\u0431\u044a\u0435\u0434\u0435\u043d\u044f\u0435\u043c<\/h3>\n
\u0418 \u0442\u0443\u0442 \u043f\u0440\u0438\u0445\u043e\u0434\u0438\u0442 \u043c\u044b\u0441\u043b\u044c: \u0447\u0442\u043e \u0435\u0441\u043b\u0438 \u043f\u043e\u043f\u0440\u043e\u0431\u043e\u0432\u0430\u0442\u044c \u043f\u0438\u0441\u0430\u0442\u044c \u043c\u0435\u0442\u043e\u0434\u044b, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044f Expression Tree?<\/p>\n
\u0421\u0430\u043c \u043f\u043e \u0441\u0435\u0431\u0435 IL \u043d\u0435 \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442 \u0432 \u041e\u041e\u041f, \u0438 \u0432\u0441\u0435 \u043c\u0435\u0442\u043e\u0434\u044b \u043f\u043e \u0441\u0432\u043e\u0435\u0439 \u0441\u0443\u0442\u0438 \u2014 \u044d\u0442\u043e \u0441\u0442\u0430\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u0444\u0443\u043d\u043a\u0446\u0438\u0438. \u0410 \u043a\u043e\u0433\u0434\u0430 \u0444\u0443\u043d\u043a\u0446\u0438\u044f \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f \u043a\u0430\u043a \u043c\u0435\u0442\u043e\u0434 \u043a\u043b\u0430\u0441\u0441\u0430, \u043d\u0443\u043b\u0435\u0432\u044b\u043c \u0430\u0440\u0433\u0443\u043c\u0435\u043d\u0442\u043e\u043c \u043f\u043e\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u044d\u043a\u0437\u0435\u043c\u043f\u043b\u044f\u0440 \u0442\u0438\u043f\u0430. \u0422\u043e\u0433\u0434\u0430 \u0442\u0435\u043e\u0440\u0435\u0442\u0438\u0447\u0435\u0441\u043a\u0438 \u043c\u043e\u0436\u043d\u043e \u043d\u0430\u043f\u0438\u0441\u0430\u0442\u044c \u0434\u0435\u043b\u0435\u0433\u0430\u0442 \u0441 \u043f\u0435\u0440\u0432\u044b\u043c \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u043e\u043c \u201cself\u201d \u0438 \u043d\u0430\u043f\u0438\u0441\u0430\u0442\u044c \u043c\u0435\u0442\u043e\u0434 \u043d\u0430 Expression Tree.<\/p>\n
\u041b\u0435\u0433\u0430\u043b\u044c\u043d\u044b\u0445 \u0441\u043f\u043e\u0441\u043e\u0431\u043e\u0432 \u043f\u043e\u0434\u0441\u0443\u043d\u0443\u0442\u044c IL \u043d\u0435\u0442, \u043f\u043e\u044d\u0442\u043e\u043c\u0443 \u043f\u0440\u0438\u0431\u0435\u0433\u043d\u0435\u043c \u043a \u0433\u0440\u044f\u0437\u043d\u043e\u043c\u0443 \u0441\u0432\u0438\u043d\u0441\u0442\u0432\u0443 \u0438 \u0447\u0435\u0440\u043d\u043e\u0439 \u043c\u0430\u0433\u0438\u0438 \u2014 \u043a \u0440\u0435\u0444\u043b\u0435\u043a\u0441\u0438\u0438.<\/p>\n
\u0415\u0441\u043b\u0438 \u0441\u0438\u043b\u044c\u043d\u043e \u043f\u043e\u043a\u043e\u043f\u0430\u0442\u044c\u0441\u044f \u0432 Expression Tree, \u0430 \u0442\u043e\u0447\u043d\u0435\u0435 \u0432 \u0442\u043e\u043c, \u043a\u0430\u043a \u0438 \u0433\u0434\u0435 \u043a\u043e\u043c\u043f\u0438\u043b\u0438\u0440\u0443\u0435\u0442\u0441\u044f IL, \u043c\u043e\u0436\u043d\u043e \u043d\u0430\u0439\u0442\u0438 \u0442\u0438\u043f System.Linq.Expressions.Compiler.LambdaCompiler<\/code> — \u043e\u043d \u0437\u0430\u043f\u0438\u0441\u044b\u0432\u0430\u0435\u0442 IL. \u0412 \u043a\u043e\u043d\u0441\u0442\u0440\u0443\u043a\u0442\u043e\u0440 \u043f\u0440\u0438\u043d\u0438\u043c\u0430\u0435\u0442 LambdaExpression<\/code> \u0438 AnalyzedTree<\/code>. AnalyzedTree<\/code> \u2014 \u044d\u0442\u043e \u043f\u0440\u043e\u0430\u043d\u0430\u043b\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0435 \u0434\u0435\u0440\u0435\u0432\u043e, \u043e\u043d\u043e \u0441\u043e\u0437\u0434\u0430\u0435\u0442 scope \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u0438 \u0438 \u0441\u043e\u0437\u0434\u0430\u0435\u0442\u0441\u044f \u0447\u0435\u0440\u0435\u0437 System.Linq.Expressions.Compiler.VariableBinder.Bind<\/code>. \u0415\u0441\u0442\u0435\u0441\u0442\u0432\u0435\u043d\u043d\u043e, \u0432\u0441\u0451 \u044d\u0442\u043e internal-\u043a\u043b\u0430\u0441\u0441\u044b.<\/p>\n
\u041d\u0430\u0439\u0434\u0435\u043c \u0442\u0438\u043f\u044b:<\/p>\n
Assembly expressionsAssembly = typeof(Expression).Assembly;Type variableBinderType = expressionsAssembly.GetType(\"System.Linq.Expressions.Compiler.VariableBinder\", throwOnError: true);Type lambdaCompilerType = expressionsAssembly.GetType(\"System.Linq.Expressions.Compiler.LambdaCompiler\", throwOnError: true);<\/code>
<\/a><\/div><\/pre>\n
\u0421\u043e\u0437\u0434\u0430\u0434\u0438\u043c LambdaCompiler<\/code>:<\/p>\n
object analyzedTree = variableBinderType.GetMethod(\"Bind\", PrivateStatic).Invoke(null, new object[] { expression });object compiler = lambdaCompilerType.GetConstructor(    PrivateInstance,    null,    new[] { analyzedTree.GetType(), typeof(LambdaExpression) },    null).Invoke(new[] { analyzedTree, expression });<\/code>
<\/a><\/div><\/pre>\n
\u0421\u043e\u0437\u0434\u0430\u0435\u043c \u043c\u0435\u0442\u043e\u0434 \u0432 \u0431\u0438\u043b\u0434\u0435\u0440\u0435. \u041d\u0435 \u0437\u0430\u0431\u044b\u0432\u0430\u0435\u043c, \u0447\u0442\u043e \u0432 \u0434\u0435\u043b\u0435\u0433\u0430\u0442\u0435 \u043f\u0435\u0440\u0432\u044b\u043c \u0430\u0440\u0433\u0443\u043c\u0435\u043d\u0442\u043e\u043c \u0443\u043a\u0430\u0437\u044b\u0432\u0430\u0435\u0442\u0441\u044f \u043e\u0431\u044a\u0435\u043a\u0442, \u043a\u043e\u0442\u043e\u0440\u043e\u043c\u0443 \u0434\u043e\u043b\u0436\u0435\u043d \u043f\u0440\u0438\u043d\u0430\u0434\u043b\u0435\u0436\u0430\u0442\u044c \u043c\u0435\u0442\u043e\u0434, \u043d\u043e \u0432 \u0441\u0430\u043c\u043e\u043c \u043c\u0435\u0442\u043e\u0434\u0435 \u043e\u043d, \u0435\u0441\u0442\u0435\u0441\u0442\u0432\u0435\u043d\u043d\u043e, \u043d\u0435 \u0432\u0438\u0434\u0435\u043d. \u0418 \u043f\u043e\u0434\u0441\u0443\u043d\u0435\u043c ILGenerator \u0432 \u043a\u043e\u043c\u043f\u0438\u043b\u044f\u0442\u043e\u0440 \u0432 \u043f\u043e\u043b\u0435 _ilg<\/code>:<\/p>\n
MethodBuilder method = typeBuilder.DefineMethod(name, DefaultMethodAttributes, expression.ReturnType, delegateParameters.Skip(1).ToArray());lambdaCompilerType.GetField(\"_ilg\", BindingFlags.NonPublic | BindingFlags.Instance).SetValue(compiler, method.GetILGenerator());<\/code>
<\/a><\/div><\/pre>\n
\u041a \u0441\u043e\u0436\u0430\u043b\u0435\u043d\u0438\u044e \u0434\u043b\u044f \u043d\u0430\u0441, \u044d\u0442\u043e \u043d\u0435 \u0432\u0441\u0451. \u041f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u043b\u044f\u043c\u0431\u0434\u0430 \u0438\u043c\u0435\u0435\u0442 \u043f\u0435\u0440\u0432\u044b\u043c \u0430\u0440\u0433\u0443\u043c\u0435\u043d\u0442\u043e\u043c \u043a\u043e\u043d\u0442\u0435\u043a\u0441\u0442 \u0437\u0430\u043c\u044b\u043a\u0430\u043d\u0438\u044f. \u041d\u0443\u0436\u043d\u043e \u0441\u043a\u0430\u0437\u0430\u0442\u044c \u043a\u043e\u043c\u043f\u0438\u043b\u044f\u0442\u043e\u0440\u0443, \u0447\u0442\u043e \u0437\u0430\u043c\u044b\u043a\u0430\u043d\u0438\u044f \u043d\u0435\u0442 (_hasClosureArgument = false<\/code>), \u0438 \u043f\u043e\u0434\u043c\u0435\u043d\u0438\u0442\u044c \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0443 \u043c\u0435\u0442\u043e\u0434\u0430 \u0432 _method<\/code>:<\/p>\n
DynamicMethod signatureMethod = new DynamicMethod(method.Name + \"_ExpressionSignature\", expression.ReturnType, delegateParameters, method.Module, skipVisibility: true);lambdaCompilerType.GetField(\"_hasClosureArgument\", BindingFlags.NonPublic | BindingFlags.Instance).SetValue(compiler, false);lambdaCompilerType.GetField(\"_method\", BindingFlags.NonPublic | BindingFlags.Instance).SetValue(compiler, signatureMethod);<\/code>
<\/a><\/div><\/pre>\n
\u041e\u0441\u0442\u0430\u043b\u043e\u0441\u044c \u0432\u044b\u0437\u0432\u0430\u0442\u044c \u043c\u0435\u0442\u043e\u0434 EmitLambdaBody<\/code>, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u0437\u0430\u043f\u0438\u0448\u0435\u0442 IL \u0432 \u043d\u0430\u0448 ILGenerator:<\/p>\n
lambdaCompilerType.GetMethod(\"EmitLambdaBody\", BindingFlags.NonPublic | BindingFlags.Instance, null, Type.EmptyTypes, null).Invoke(compiler, null);<\/code>
<\/a><\/div><\/pre>\n
\u0418 \u0432\u0443\u0430\u043b\u044f! \u0422\u0435\u043f\u0435\u0440\u044c \u043c\u0435\u0442\u043e\u0434\u044b \u043c\u043e\u0436\u043d\u043e \u043f\u0438\u0441\u0430\u0442\u044c \u043d\u0430 Expression Tree. \u041d\u043e \u0435\u0441\u0442\u044c \u043d\u044e\u0430\u043d\u0441\u044b \u0440\u0430\u0431\u043e\u0442\u044b \u0441 self. \u041f\u0435\u0440\u0435\u043f\u0438\u0448\u0435\u043c \u043d\u0430\u0448 \u043c\u0435\u0442\u043e\u0434 Some \u043d\u0430 Expression Tree:<\/p>\n
Type studentType = AssemblyFactory.CreateAssembly(\"StudentWithoutInterfaceExpressionTreeAssembly\")    .CreateClass(\"Student\", typeof(object), new[] { typeof(IStudent) })    .AddProperty(typeof(string), \"Name\")    .AddMethod(\"Some\", typeBuilder =>    {        \/\/ \u0422\u0430\u043a \u043a\u0430\u043a \u0442\u0438\u043f \u0435\u0449\u0451 \u043d\u0435 \u0441\u043e\u0437\u0434\u0430\u043d, \u043d\u0443\u0436\u043d\u043e \u043f\u0440\u0438\u043d\u0438\u043c\u0430\u0442\u044c object        ParameterExpression self = Expression.Parameter(typeof(object), \"self\");        ParameterExpression value = Expression.Parameter(typeof(string), \"value\");        \/\/ \u0418 \u043a\u043e\u043d\u0432\u0435\u0440\u0442\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0432 \u043e\u0436\u0438\u0434\u0430\u0435\u043c\u044b\u0439 \u0442\u0438\u043f. \u041f\u043e\u0432\u0435\u0437\u043b\u043e, \u0447\u0442\u043e TypeBuilder \u2014 \u043d\u0430\u0441\u043b\u0435\u0434\u043d\u0438\u043a Type.        UnaryExpression typedSelf = Expression.Convert(self, typeBuilder.Type);        \/\/ \u041c\u044b \u0441\u043e\u0437\u0434\u0430\u0432\u0430\u043b\u0438 \u0441\u0432\u043e\u0439\u0441\u0442\u0432\u043e, \u043d\u043e \u043f\u0440\u0438 \u043f\u043e\u043f\u044b\u0442\u043a\u0435 \u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u043a \u043d\u0435\u043c\u0443 \u0431\u0443\u0434\u0435\u0442 \u043e\u0448\u0438\u0431\u043a\u0430. \u041e\u043f\u044f\u0442\u044c \u0436\u0435 \u0438\u0437-\u0437\u0430 \u043d\u0435\u0441\u043a\u043e\u043c\u043f\u0438\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0433\u043e \u0442\u0438\u043f\u0430.        \/\/ \u041f\u043e\u044d\u0442\u043e\u043c\u0443 \u043c\u043e\u0436\u043d\u043e \u0440\u0430\u0431\u043e\u0442\u0430\u0442\u044c \u0442\u043e\u043b\u044c\u043a\u043e \u0441 \u043f\u043e\u043b\u044f\u043c\u0438, \u0437\u0430\u0442\u043e \u043c\u043e\u0436\u043d\u043e \u0440\u0430\u0431\u043e\u0442\u0430\u0442\u044c \u0441 \u043b\u044e\u0431\u044b\u043c\u0438 \u043f\u043e\u043b\u044f\u043c\u0438.        MemberExpression name = Expression.Field(typedSelf, typeBuilder.GetField(\"_Name\"));        \/\/ \u043d\u0430\u0445\u043e\u0434\u0438\u043c \u043c\u0435\u0442\u043e\u0434\u044b string.Concat \u0438 Console.WriteLine        MethodInfo concatMethod = typeof(string).GetMethod(nameof(string.Concat), new[] { typeof(string), typeof(string) });        MethodInfo writeLineMethod = typeof(Console).GetMethod(nameof(Console.WriteLine), new[] { typeof(string) });        \/\/ \u041e\u043f\u0438\u0441\u044b\u0432\u0430\u0435\u043c \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0443\u044e, \u0432 \u043a\u043e\u0442\u043e\u0440\u0443\u044e \u0441\u043e\u0445\u0440\u0430\u043d\u0438\u043c \u043a\u043e\u043d\u043a\u0430\u0442\u0435\u043d\u0430\u0446\u0438\u044e        ParameterExpression str = Expression.Variable(typeof(string), \"str\");        ParameterExpression[] variables = new[] { str };        \/\/ string.Concat(_Name, value)        MethodCallExpression concatExpression = Expression.Call(concatMethod, name, value);                \/\/ str = string.Concat(_Name, value)        BinaryExpression assign = Expression.Assign(str, concatExpression);        \/\/ Console.WriteLine(str);        MethodCallExpression callWriteLine = Expression.Call(writeLineMethod, str);                \/\/ str.Length        MemberExpression returnValue = Expression.Property(str, nameof(string.Length));        \/\/ \u0441\u043e\u0437\u0434\u0430\u0435\u043c \u0431\u043b\u043e\u043a, \u043f\u0435\u0440\u0432\u044b\u043c \u0430\u0440\u0433\u0443\u043c\u0435\u043d\u0442\u043e\u043c \u0432\u0441\u0435\u0433\u0434\u0430 \u0438\u0434\u0443\u0442 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0435 \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0442\u0441\u044f \u0432 \u044d\u0442\u043e\u043c \u0431\u043b\u043e\u043a\u0435        \/\/ \u0430 \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0438\u043c \u0434\u043e\u043b\u0436\u0435\u043d \u0431\u044b\u0442\u044c return        BlockExpression body = Expression.Block(            variables,            assign,            callWriteLine,            returnValue        );        return Expression.Lambda<Func<object, string, int>>(            body,            self, value        );    })    .Build();<\/code>
<\/a><\/div><\/pre>\n
\n\u041f\u043e\u043b\u043d\u044b\u0439 \u043b\u0438\u0441\u0442\u0438\u043d\u0433 \u0444\u0430\u0431\u0440\u0438\u043a\u0438:<\/summary>\n
\n
private class AssemblyFactory{    public static AssemblyFactory CreateAssembly(string name)    {        AssemblyBuilder assemblyBuilder = AssemblyBuilder.DefineDynamicAssembly(new AssemblyName(name), AssemblyBuilderAccess.Run);        ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule(name);        return new AssemblyFactory(moduleBuilder);    }    private readonly ModuleBuilder moduleBuilder;    private AssemblyFactory(ModuleBuilder moduleBuilder)    {        this.moduleBuilder = moduleBuilder;    }    public DynamicTypeBuilder CreateClass(string name, Type baseType, Type[] interfaces)    {        TypeBuilder typeBuilder = moduleBuilder.DefineType(name, TypeAttributes.Public | TypeAttributes.Class | TypeAttributes.Serializable, baseType, interfaces);        return new DynamicTypeBuilder(typeBuilder);    }}private sealed class DynamicTypeBuilder(TypeBuilder typeBuilder){    private const MethodAttributes DefaultMethodAttributes =        MethodAttributes.Public | MethodAttributes.Virtual | MethodAttributes.HideBySig | MethodAttributes.NewSlot | MethodAttributes.Final;    private const MethodAttributes PropertyMethodAttributes = DefaultMethodAttributes | MethodAttributes.SpecialName;    private readonly IDictionary<string, FieldBuilder> fields = new Dictionary<string, FieldBuilder>(StringComparer.Ordinal);    private readonly IDictionary<string, PropertyBuilder> properties = new Dictionary<string, PropertyBuilder>(StringComparer.Ordinal);    public Type Type => typeBuilder;    public DynamicTypeBuilder AddField(Type type, string name)    {        fields[name] = typeBuilder.DefineField(name, type, FieldAttributes.Public);        return this;    }    public DynamicTypeBuilder AddProperty(Type type, string name)    {        FieldBuilder field = typeBuilder.DefineField($\"_{name}\", type, FieldAttributes.Private);        fields[field.Name] = field;        PropertyBuilder property = typeBuilder.DefineProperty(name, PropertyAttributes.None, type, Type.EmptyTypes);        properties[name] = property;        MethodBuilder getter = typeBuilder.DefineMethod($\"get_{name}\", PropertyMethodAttributes, type, Type.EmptyTypes);        ILGenerator getterIl = getter.GetILGenerator();        getterIl.Emit(OpCodes.Ldarg_0);        getterIl.Emit(OpCodes.Ldfld, field);        getterIl.Emit(OpCodes.Ret);        property.SetGetMethod(getter);        MethodBuilder setter = typeBuilder.DefineMethod($\"set_{name}\", PropertyMethodAttributes, typeof(void), new[] { type });        ILGenerator setterIl = setter.GetILGenerator();        setterIl.Emit(OpCodes.Ldarg_0);        setterIl.Emit(OpCodes.Ldarg_1);        setterIl.Emit(OpCodes.Stfld, field);        setterIl.Emit(OpCodes.Ret);        property.SetSetMethod(setter);        return this;    }    public FieldBuilder GetField(string name)    {        return fields[name];    }    public PropertyBuilder GetProperty(string name)    {        return properties[name];    }    public DynamicTypeBuilder AddMethod(Type returnType, string name, Type[] parameterTypes, Action<ILGenerator, DynamicTypeBuilder> emit)    {        MethodBuilder method = typeBuilder.DefineMethod(name, DefaultMethodAttributes, returnType, parameterTypes);        emit(method.GetILGenerator(), this);        return this;    }    public DynamicTypeBuilder AddMethod<TDelegate>(string name, Func<DynamicTypeBuilder, Expression<TDelegate>> expressionFactory)        where TDelegate : Delegate    {        Expression<TDelegate> expression = expressionFactory(this);        Type[] delegateParameters = expression.Parameters.Select(x => x.Type).ToArray();        if (delegateParameters.Length == 0)        {            throw new ArgumentException(\"Expression must have the instance as its first parameter.\", nameof(expression));        }        Assembly expressionsAssembly = typeof(Expression).Assembly;        Type variableBinderType = expressionsAssembly.GetType(\"System.Linq.Expressions.Compiler.VariableBinder\", throwOnError: true);        Type lambdaCompilerType = expressionsAssembly.GetType(\"System.Linq.Expressions.Compiler.LambdaCompiler\", throwOnError: true);        object analyzedTree = variableBinderType.GetMethod(\"Bind\", BindingFlags.NonPublic | BindingFlags.Static).Invoke(null, new object[] { expression });        object compiler = lambdaCompilerType.GetConstructor(            BindingFlags.NonPublic | BindingFlags.Instance,            null,            new[] { analyzedTree.GetType(), typeof(LambdaExpression) },            null).Invoke(new[] { analyzedTree, expression });        MethodBuilder method = typeBuilder.DefineMethod(name, DefaultMethodAttributes, expression.ReturnType, delegateParameters.Skip(1).ToArray());        DynamicMethod signatureMethod = new DynamicMethod(method.Name + \"_ExpressionSignature\", expression.ReturnType, delegateParameters, method.Module, skipVisibility: true);        lambdaCompilerType.GetField(\"_ilg\", BindingFlags.NonPublic | BindingFlags.Instance).SetValue(compiler, method.GetILGenerator());        lambdaCompilerType.GetField(\"_hasClosureArgument\", BindingFlags.NonPublic | BindingFlags.Instance).SetValue(compiler, false);        lambdaCompilerType.GetField(\"_method\", BindingFlags.NonPublic | BindingFlags.Instance).SetValue(compiler, signatureMethod);        lambdaCompilerType.GetMethod(\"EmitLambdaBody\", BindingFlags.NonPublic | BindingFlags.Instance, null, Type.EmptyTypes, null).Invoke(compiler, null);        return this;    }    public Type Build()    {        typeBuilder.DefineDefaultConstructor(MethodAttributes.Public);        return typeBuilder.CreateTypeInfo().AsType();    }}<\/code>
<\/a><\/div><\/pre>\n<\/div>\n<\/details>\n
\u0417\u0430\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435<\/h3>\n
\u041c\u044b \u043f\u0440\u043e\u0448\u043b\u0438 \u043f\u0443\u0442\u044c \u043e\u0442 \u043d\u0438\u0437\u043a\u043e\u0443\u0440\u043e\u0432\u043d\u0435\u0432\u044b\u0445 IL \u0434\u043e \u0432\u044b\u0441\u043e\u043a\u043e\u0443\u0440\u043e\u0432\u043d\u0435\u0432\u044b\u0445 Expression Trees. \u0422\u0430\u043a\u043e\u0439 \u043f\u043e\u0434\u0445\u043e\u0434 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0441\u043e\u0437\u0434\u0430\u0432\u0430\u0442\u044c \u0434\u0438\u043d\u0430\u043c\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u0442\u0438\u043f\u044b, \u043d\u0435 \u0436\u0435\u0440\u0442\u0432\u0443\u044f \u043f\u0440\u0438 \u044d\u0442\u043e\u043c \u0447\u0438\u0442\u0430\u0435\u043c\u043e\u0441\u0442\u044c\u044e.<\/p>\n
\u0421\u0442\u0430\u0442\u044c\u044f \u0438 \u0442\u0430\u043a \u043f\u043e\u043b\u0443\u0447\u0438\u043b\u0430\u0441\u044c \u0431\u043e\u043b\u044c\u0448\u043e\u0439, \u043c\u043e\u0436\u0435\u0442 \u043f\u043e\u0437\u0436\u0435 \u0440\u0430\u0437\u0431\u0435\u0440\u0443 Roslyn \u043a\u0430\u043a \u0430\u043b\u044c\u0442\u0435\u0440\u043d\u0430\u0442\u0438\u0432\u043d\u044b\u0439 \u0441\u043f\u043e\u0441\u043e\u0431.<\/p>\n<\/div>\n
\u0441\u0441\u044b\u043b\u043a\u0430 \u043d\u0430 \u043e\u0440\u0438\u0433\u0438\u043d\u0430\u043b \u0441\u0442\u0430\u0442\u044c\u0438 https:\/\/habr.com\/ru\/articles\/1033564\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
\u0418\u043d\u043e\u0433\u0434\u0430 \u0432 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u0432\u043e\u0437\u043d\u0438\u043a\u0430\u044e\u0442 \u0437\u0430\u0434\u0430\u0447\u0438, \u0442\u0440\u0435\u0431\u0443\u044e\u0449\u0438\u0435 \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u0442\u0438\u043f\u043e\u0432 \u0432 \u0440\u0430\u043d\u0442\u0430\u0439\u043c\u0435. \u0427\u0430\u0449\u0435 \u0432\u0441\u0435\u0433\u043e \u044d\u0442\u043e \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u043e \u043f\u0440\u0438 \u043d\u0430\u043f\u0438\u0441\u0430\u043d\u0438\u0438 \u0434\u0435\u043a\u043b\u0430\u0440\u0430\u0442\u0438\u0432\u043d\u044b\u0445 \u0441\u0435\u0440\u0432\u0438\u0441\u043e\u0432, \u0432\u044b\u0441\u043e\u043a\u043e\u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0445 \u043c\u0430\u043f\u043f\u0435\u0440\u043e\u0432 \u0438\u043b\u0438 \u0441\u0438\u0441\u0442\u0435\u043c \u0441 \u0434\u0438\u043d\u0430\u043c\u0438\u0447\u0435\u0441\u043a\u0438\u043c \u043f\u0440\u043e\u043a\u0441\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435\u043c.\u0414\u043e\u043f\u0443\u0441\u0442\u0438\u043c, \u043c\u044b \u0445\u043e\u0442\u0438\u043c \u0441\u0433\u0435\u043d\u0435\u0440\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0442\u0438\u043f \u0441 \u0442\u0430\u043a\u0438\u043c \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441\u043e\u043c:public interface IStudent{    string Name { get; set; }    int Some(string value);}\u041b\u043e\u0433\u0438\u043a\u0430 \u043c\u0435\u0442\u043e\u0434\u0430 Some (\u043f\u0440\u043e\u0441\u0442\u043e \u0434\u043b\u044f \u043f\u0440\u0438\u043c\u0435\u0440\u0430):public int Some(string value){    string str = Name + value;    Console.WriteLine(str);    return str.Length;}Reflection.Emit\u041c\u043e\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c System.Reflection.Emit.\/\/ 1. \u0421\u043e\u0437\u0434\u0430\u0435\u043c \u0441\u0431\u043e\u0440\u043a\u0443, \u043c\u043e\u0434\u0443\u043b\u044c \u0438 \u0442\u0438\u043fAssemblyBuilder assemblyBuilder = AssemblyBuilder.DefineDynamicAssembly(new AssemblyName(«StudentReflectionEmitAssembly»), AssemblyBuilderAccess.Run);ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule(«StudentReflectionEmitModule»);TypeBuilder typeBuilder = moduleBuilder.DefineType(«Student», TypeAttributes.Public | TypeAttributes.Class | TypeAttributes.Serializable, typeof(object), new[] { typeof(IStudent) });\/\/ 2. \u041e\u0431\u044a\u044f\u0432\u043b\u044f\u0435\u043c backing-\u043f\u043e\u043b\u0435 \u0438 \u0441\u0432\u043e\u0439\u0441\u0442\u0432\u043eFieldBuilder nameField = typeBuilder.DefineField(«_name», typeof(string), FieldAttributes.Private);PropertyBuilder nameProperty = typeBuilder.DefineProperty(«Name», PropertyAttributes.None, typeof(string), Type.EmptyTypes);\/\/ 3. \u0421\u043e\u0437\u0434\u0430\u0435\u043c \u0441\u0435\u0442\u0442\u0435\u0440\u044b, \u0433\u0435\u0442\u0442\u0435\u0440\u044b \u0438 \u043c\u0435\u0442\u043e\u0434MethodBuilder getter = typeBuilder.DefineMethod(«get_Name», MethodAttributes.Public | MethodAttributes.Virtual | MethodAttributes.HideBySig | MethodAttributes.SpecialName | MethodAttributes.NewSlot | MethodAttributes.Final, typeof(string), Type.EmptyTypes);MethodBuilder setter = typeBuilder.DefineMethod(«set_Name», MethodAttributes.Public | MethodAttributes.Virtual | MethodAttributes.HideBySig | MethodAttributes.SpecialName | MethodAttributes.NewSlot | MethodAttributes.Final, typeof(void), new[] { typeof(string) });MethodBuilder someMethod = typeBuilder.DefineMethod(«Some», MethodAttributes.Public | MethodAttributes.Virtual | MethodAttributes.HideBySig | MethodAttributes.NewSlot | MethodAttributes.Final, typeof(int), new[] { typeof(string) });\/\/ 4. \u041f\u0438\u0448\u0435\u043c \u043b\u043e\u0433\u0438\u043a\u0443 \u0441\u0432\u043e\u0439\u0441\u0442\u0432ILGenerator getterIl = getter.GetILGenerator();getterIl.Emit(OpCodes.Ldarg_0);getterIl.Emit(OpCodes.Ldfld, nameField);getterIl.Emit(OpCodes.Ret);nameProperty.SetGetMethod(getter);ILGenerator setterIl = setter.GetILGenerator();setterIl.Emit(OpCodes.Ldarg_0);setterIl.Emit(OpCodes.Ldarg_1);setterIl.Emit(OpCodes.Stfld, nameField);setterIl.Emit(OpCodes.Ret);nameProperty.SetSetMethod(setter);\/\/ 5. \u041f\u0438\u0448\u0435\u043c \u043b\u043e\u0433\u0438\u043a\u0443 \u043c\u0435\u0442\u043e\u0434\u0430 SomeILGenerator someIl = someMethod.GetILGenerator();LocalBuilder str = someIl.DeclareLocal(typeof(string));someIl.Emit(OpCodes.Ldarg_0);someIl.Emit(OpCodes.Call, getter);someIl.Emit(OpCodes.Ldarg_1);someIl.Emit(OpCodes.Call, typeof(string).GetMethod(nameof(string.Concat), new[] { typeof(string), typeof(string) }));someIl.Emit(OpCodes.Stloc, str);someIl.Emit(OpCodes.Ldloc, str);someIl.Emit(OpCodes.Call, typeof(Console).GetMethod(nameof(Console.WriteLine), new[] { typeof(string) }));someIl.Emit(OpCodes.Ldloc, str);someIl.Emit(OpCodes.Call, typeof(string).GetProperty(nameof(string.Length)).GetGetMethod());someIl.Emit(OpCodes.Ret);\/\/ 6. \u0424\u0438\u043d\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f \u0442\u0438\u043f\u0430typeBuilder.DefineDefaultConstructor(MethodAttributes.Public);Type studentType = typeBuilder.CreateTypeInfo().AsType();\u041f\u043e\u043b\u0443\u0447\u0438\u043b\u0441\u044f \u043c\u043d\u043e\u0433\u043e\u0441\u043b\u043e\u0432\u043d\u044b\u0439 \u043a\u043e\u0434. \u0425\u043e\u0442\u044f \u043e\u043d \u043e\u0447\u0435\u043d\u044c \u0448\u0430\u0431\u043b\u043e\u043d\u043d\u044b\u0439, \u043c\u043e\u0436\u043d\u043e \u043d\u0430\u043f\u0438\u0441\u0430\u0442\u044c \u043d\u0435\u0431\u043e\u043b\u044c\u0448\u0443\u044e \u043e\u0431\u0435\u0440\u0442\u043a\u0443 \u0438 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c:AssemblyFactory\u042d\u0442\u043e \u043f\u043e\u0437\u0432\u043e\u043b\u0438\u0442 \u043e\u043f\u0438\u0441\u044b\u0432\u0430\u0442\u044c \u0442\u0438\u043f\u044b \u0432 \u0434\u0435\u043a\u043b\u0430\u0440\u0430\u0442\u0438\u0432\u043d\u043e\u043c \u0441\u0442\u0438\u043b\u0435:Type studentType = AssemblyFactory.CreateAssembly(«StudentReflectionEmitAssembly»)    .CreateClass(«Student», typeof(object), new[] { typeof(IStudent) })    .AddProperty(typeof(string), nameof(IStudent.Name))    .AddMethod(typeof(int), nameof(IStudent.Some), new[] { typeof(string) }, (ilGenerator, typeBuilder) =>    {        LocalBuilder str = ilGenerator.DeclareLocal(typeof(string));        ilGenerator.Emit(OpCodes.Ldarg_0);        ilGenerator.Emit(OpCodes.Call, typeBuilder.GetProperty(nameof(IStudent.Name)).GetGetMethod());        ilGenerator.Emit(OpCodes.Ldarg_1);        ilGenerator.Emit(OpCodes.Call, typeof(string).GetMethod(nameof(string.Concat), new[] { typeof(string), typeof(string) }));        ilGenerator.Emit(OpCodes.Stloc, str);        ilGenerator.Emit(OpCodes.Ldloc, str);        ilGenerator.Emit(OpCodes.Call, typeof(Console).GetMethod(nameof(Console.WriteLine), new[] { typeof(string) }));        ilGenerator.Emit(OpCodes.Ldloc, str);        ilGenerator.Emit(OpCodes.Call, typeof(string).GetProperty(nameof(string.Length)).GetGetMethod());        ilGenerator.Emit(OpCodes.Ret);    })    .Build();\u0414\u043b\u044f \u044d\u0442\u043e\u0433\u043e \u043d\u0430\u043f\u0438\u0448\u0435\u043c \u0444\u0430\u0431\u0440\u0438\u043a\u0443:private class AssemblyFactory{    \/\/ \u0421\u043e\u0437\u0434\u0430\u0435\u0442 \u0441\u0431\u043e\u0440\u043a\u0443    public static AssemblyFactory CreateAssembly(string name)    {        AssemblyBuilder assemblyBuilder = AssemblyBuilder.DefineDynamicAssembly(new AssemblyName(name), AssemblyBuilderAccess.Run);        ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule(name);        return new AssemblyFactory(moduleBuilder);    }    private readonly ModuleBuilder moduleBuilder;    private AssemblyFactory(ModuleBuilder moduleBuilder)    {        this.moduleBuilder = moduleBuilder;    }    \/\/ \u0421\u043e\u0437\u0434\u0430\u0435\u0442 \u043a\u043b\u0430\u0441\u0441 \u0432 \u0441\u0431\u043e\u0440\u043a\u0435    public DynamicTypeBuilder CreateClass(string name, Type baseType, Type[] interfaces)    {        TypeBuilder typeBuilder = moduleBuilder.DefineType(name, TypeAttributes.Public | TypeAttributes.Class | TypeAttributes.Serializable, baseType, interfaces);        return new DynamicTypeBuilder(typeBuilder);    }}\u0418 \u0431\u0438\u043b\u0434\u0435\u0440 \u043a\u043b\u0430\u0441\u0441\u043e\u0432:private sealed class DynamicTypeBuilder(TypeBuilder typeBuilder){    \/\/ \u0442\u0435 \u0436\u0435 \u0430\u0442\u0440\u0438\u0431\u0443\u0442\u044b, \u0447\u0442\u043e \u0438 \u0440\u0430\u043d\u044c\u0448\u0435    private const MethodAttributes DefaultMethodAttributes = MethodAttributes.Public | MethodAttributes.Virtual | MethodAttributes.HideBySig | MethodAttributes.NewSlot | MethodAttributes.Final;    private const MethodAttributes PropertyMethodAttributes = DefaultMethodAttributes | MethodAttributes.SpecialName;    \/\/ \u0441\u043e\u0445\u0440\u0430\u043d\u044f\u0435\u043c \u043f\u043e\u043b\u044f \u0438 \u0441\u0432\u043e\u0439\u0441\u0442\u0432\u0430 \u0434\u043b\u044f \u0434\u043e\u0441\u0442\u0443\u043f\u0430    private readonly IDictionary<string, FieldBuilder> fields = new Dictionary<string, FieldBuilder>(StringComparer.Ordinal);    private readonly IDictionary<string, PropertyBuilder> properties = new Dictionary<string, PropertyBuilder>(StringComparer.Ordinal);    \/\/ \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u0435 \u043f\u043e\u043b\u0435\u0439 \u043e\u0447\u0435\u043d\u044c \u043f\u0440\u043e\u0441\u0442\u043e\u0435    public DynamicTypeBuilder AddField(Type type, string name)    {        fields[name] = typeBuilder.DefineField(name, type, FieldAttributes.Public);        return this;    }    \/\/ \u0441\u0432\u043e\u0439\u0441\u0442\u0432\u043e \u0447\u0443\u0442\u044c \u0441\u043b\u043e\u0436\u043d\u0435\u0435, \u043d\u043e \u0442\u0430\u043a \u0436\u0435 \u0432\u0437\u044f\u0442\u043e \u0438\u0437 \u043a\u043e\u0434\u0430 \u0432\u044b\u0448\u0435    public DynamicTypeBuilder AddProperty(Type type, string name)    {        FieldBuilder field = typeBuilder.DefineField($»_{name}», type, FieldAttributes.Private);        fields[name] = field;        PropertyBuilder property = typeBuilder.DefineProperty(name, PropertyAttributes.None, type, Type.EmptyTypes);        properties[name] = property;        MethodBuilder getter = typeBuilder.DefineMethod($»get_{name}», PropertyMethodAttributes, type, Type.EmptyTypes);        ILGenerator getterIl = getter.GetILGenerator();        getterIl.Emit(OpCodes.Ldarg_0);        getterIl.Emit(OpCodes.Ldfld, field);        getterIl.Emit(OpCodes.Ret);        property.SetGetMethod(getter);        MethodBuilder setter = typeBuilder.DefineMethod($»set_{name}», PropertyMethodAttributes, typeof(void), new[] { type });        ILGenerator setterIl = setter.GetILGenerator();        setterIl.Emit(OpCodes.Ldarg_0);        setterIl.Emit(OpCodes.Ldarg_1);        setterIl.Emit(OpCodes.Stfld, field);        setterIl.Emit(OpCodes.Ret);        property.SetSetMethod(setter);        return this;    }    public FieldBuilder GetField(string name)    {        return fields[name];    }    public PropertyBuilder GetProperty(string name)    {        return properties[name];    }    \/\/ \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u0435 \u043c\u0435\u0442\u043e\u0434\u043e\u0432 \u0434\u0435\u043b\u0435\u0433\u0438\u0440\u0443\u0435\u0442\u0441\u044f \u0432\u044b\u0437\u044b\u0432\u0430\u044e\u0449\u0435\u0439 \u0441\u0442\u043e\u0440\u043e\u043d\u0435    public DynamicTypeBuilder AddMethod(Type returnType, string name, Type[] parameterTypes, Action<ILGenerator, DynamicTypeBuilder> emit)    {        MethodBuilder method = typeBuilder.DefineMethod(name, DefaultMethodAttributes, returnType, parameterTypes);        emit(method.GetILGenerator(), this);        return this;    }    \/\/ \u0438 \u0441\u0430\u043c\u043e \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u0435 \u0442\u0438\u043f\u0430    public Type Build()    {        typeBuilder.DefineDefaultConstructor(MethodAttributes.Public);        return typeBuilder.CreateTypeInfo().AsType();    }}\u042d\u0442\u043e\u0433\u043e \u0443\u0436\u0435 \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e, \u0447\u0442\u043e\u0431\u044b \u0441\u043e\u0437\u0434\u0430\u0432\u0430\u0442\u044c DTO \u0438 \u043f\u0438\u0441\u0430\u0442\u044c \u043f\u0440\u043e\u0441\u0442\u044b\u0435 \u043c\u0435\u0442\u043e\u0434\u044b, \u043d\u043e \u043f\u0438\u0441\u0430\u0442\u044c IL \u2014 \u043d\u0435 \u0441\u0430\u043c\u043e\u0435 \u043f\u0440\u0438\u044f\u0442\u043d\u043e\u0435 \u0437\u0430\u043d\u044f\u0442\u0438\u0435. \u041d\u0430 \u044d\u0442\u043e\u043c \u043c\u043e\u043c\u0435\u043d\u0442\u0435 \u043d\u0443\u0436\u043d\u043e \u043f\u043e\u0434\u0443\u043c\u0430\u0442\u044c: \u0430 \u0447\u0442\u043e \u043c\u043e\u0436\u0435\u0442 \u0433\u0435\u043d\u0435\u0440\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u043b\u043e\u0433\u0438\u043a\u0443 \u0432 IL?Expression Trees\u0421\u043d\u0430\u0447\u0430\u043b\u0430 \u043d\u0443\u0436\u043d\u043e \u0432\u043a\u0440\u0430\u0442\u0446\u0435 \u0440\u0430\u0437\u043e\u0431\u0440\u0430\u0442\u044c\u0441\u044f, \u043a\u0430\u043a \u043e\u043d\u043e \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442. \u0420\u0430\u0431\u043e\u0442\u0430 \u0441 \u043d\u0438\u043c \u0438\u0434\u0435\u0442 \u0447\u0435\u0440\u0435\u0437 \u0441\u0442\u0430\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u043c\u0435\u0442\u043e\u0434\u044b System.Linq.Expressions.Expression.\u0414\u043e\u043f\u0443\u0441\u0442\u0438\u043c, \u043c\u044b \u0445\u043e\u0442\u0438\u043c \u043f\u043e\u0441\u0442\u0440\u043e\u0438\u0442\u044c \u0434\u0435\u0440\u0435\u0432\u043e \u0434\u043b\u044f (User u) => u.Age >= 18.\u0414\u043b\u044f \u043f\u043e\u0441\u0442\u0440\u043e\u0435\u043d\u0438\u044f \u0434\u0435\u0440\u0435\u0432\u0430 \u0432\u044b\u0437\u044b\u0432\u0430\u0435\u0442\u0441\u044f \u043c\u0435\u0442\u043e\u0434 Expression.Lambda, \u043e\u043d \u043f\u043e\u043b\u0443\u0447\u0430\u0435\u0442 \u0434\u0436\u0435\u043d\u0435\u0440\u0438\u043a \u0434\u0435\u043b\u0435\u0433\u0430\u0442\u0430 Func<>, Action<>, \u0442\u0435\u043b\u043e \u0438 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u044b. \u041d\u0443\u0436\u043d\u043e \u0441\u043d\u0430\u0447\u0430\u043b\u0430 \u0441\u043e\u0437\u0434\u0430\u0442\u044c \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u044b \u0447\u0435\u0440\u0435\u0437 Expression.Parameter \u0438 \u043f\u0435\u0440\u0435\u0434\u0430\u0442\u044c \u0432 Lambda. \u0415\u0441\u043b\u0438 \u0442\u0438\u043f\u044b \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u043e\u0432 \u0438 \u0434\u0435\u043b\u0435\u0433\u0430\u0442\u043e\u0432 \u043d\u0435 \u0441\u043e\u0432\u043f\u0430\u0434\u0430\u044e\u0442 \u2014 \u0431\u0443\u0434\u0435\u0442 \u0432\u044b\u0431\u0440\u043e\u0448\u0435\u043d\u043e \u0438\u0441\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435.\/\/ \u0432\u0445\u043e\u0434\u044f\u0449\u0438\u0435 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u044b \u043e\u043f\u0438\u0441\u044b\u0432\u0430\u044e\u0442\u0441\u044f \u043a\u0430\u043a\u043e\u0439 \u0442\u0438\u043f \u0438 \u043a\u0430\u043a\u043e\u0435 \u0438\u043c\u044f (\u0438\u043c\u0435\u043d\u0430 \u043c\u043e\u0433\u0443\u0442 \u043f\u043e\u0432\u0442\u043e\u0440\u044f\u0442\u044c\u0441\u044f \u0438\u043b\u0438 \u0438\u0445 \u043c\u043e\u0436\u0435\u0442 \u043d\u0435 \u0431\u044b\u0442\u044c, \u043e\u043d\u0438 \u043d\u0443\u0436\u043d\u044b \u0432 \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u043c \u0434\u043b\u044f \u043e\u0442\u043b\u0430\u0434\u043a\u0438)ParameterExpression paramUser = Expression.Parameter(typeof(User), «u»);Expression body = …;Expression<Predicate<User>> lambda = Expression.Lambda<Predicate<User>>(    body, \/\/ \u0442\u0435\u043b\u043e \u0432\u044b\u0440\u0430\u0436\u0435\u043d\u0438\u044f    paramUser \/\/ \u0438 \u0432\u0445\u043e\u0434\u044f\u0449\u0438\u0435 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u044b \u043f\u0435\u0440\u0435\u0434\u0430\u044e\u0442\u0441\u044f \u0437\u0434\u0435\u0441\u044c);\u0422\u0435\u043f\u0435\u0440\u044c \u043d\u0443\u0436\u043d\u043e \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043f\u043e\u043b\u0435 Age \u0438 \u0441\u0440\u0430\u0432\u043d\u0438\u0442\u044c \u0435\u0433\u043e \u0441 18.\/\/ \u043f\u043e\u043b\u0443\u0447\u0430\u0435\u043c \u043f\u043e\u043b\u0435, \u0441 \u043a\u043e\u0442\u043e\u0440\u044b\u043c \u0445\u043e\u0442\u0438\u043c \u0440\u0430\u0431\u043e\u0442\u0430\u0442\u044cMemberExpression propAge = Expression.PropertyOrField(paramUser, «Age»);\/\/ \u0441\u043e\u0437\u0434\u0430\u0435\u043c \u043a\u043e\u043d\u0441\u0442\u0430\u043d\u0442\u0443, \u0442\u0430\u043a \u043a\u0430\u043a \u043c\u043e\u0436\u043d\u043e \u0440\u0430\u0431\u043e\u0442\u0430\u0442\u044c \u0442\u043e\u043b\u044c\u043a\u043e \u0441 Expression ConstantExpression const18 = Expression.Constant(18, typeof(int));\/\/ \u0438 \u0434\u0435\u043b\u0430\u0435\u043c \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0443 \u00ab\u0431\u043e\u043b\u044c\u0448\u0435 \u0438\u043b\u0438 \u0440\u0430\u0432\u043d\u043e\u00bb. \u041b\u044e\u0431\u043e\u0435 Expression \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u0442\u0435\u043b\u043e\u043c, \u0432 \u043d\u0430\u0448\u0435\u043c \u0441\u043b\u0443\u0447\u0430\u0435 \u044d\u0442\u043e \u0431\u0443\u0434\u0435\u0442 greaterOrEqualBinaryExpression greaterOrEqual = Expression.GreaterThanOrEqual(propAge, const18);\u041f\u043e\u043b\u043d\u044b\u0439 \u043a\u043e\u0434 \u0432\u044b\u0433\u043b\u044f\u0434\u0438\u0442 \u0442\u0430\u043a:ParameterExpression paramUser =…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-479240","post","type-post","status-publish","format-standard","hentry"],"_links":{"self":[{"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/posts\/479240","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=479240"}],"version-history":[{"count":0,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/posts\/479240\/revisions"}],"wp:attachment":[{"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=479240"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=479240"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=479240"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}