DynamicMethod.CreateDelegate 메서드

Source:

DynamicMethod.cs

Source:

DynamicMethod.CoreCLR.cs

Source:

DynamicMethod.CoreCLR.cs

public:
 override Delegate ^ CreateDelegate(Type ^ delegateType);

public:
 Delegate ^ CreateDelegate(Type ^ delegateType);

public override sealed Delegate CreateDelegate (Type delegateType);

[System.Runtime.InteropServices.ComVisible(true)]
public Delegate CreateDelegate (Type delegateType);

[System.Runtime.InteropServices.ComVisible(true)]
public override sealed Delegate CreateDelegate (Type delegateType);

override this.CreateDelegate : Type -> Delegate

[<System.Runtime.InteropServices.ComVisible(true)>]
member this.CreateDelegate : Type -> Delegate

[<System.Runtime.InteropServices.ComVisible(true)>]
override this.CreateDelegate : Type -> Delegate

Public Overrides NotOverridable Function CreateDelegate (delegateType As Type) As Delegate

Public Function CreateDelegate (delegateType As Type) As Delegate

매개 변수

반환

지정된 형식의 대리자로, 동적 메서드를 실행하는 데 사용할 수 있습니다.

특성

ComVisibleAttribute

예외

예제

다음 코드 예제에서는 두 개의 매개 변수를 사용하는 동적 메서드를 만듭니다. 이 예제에서는 첫 번째 매개 변수를 콘솔에 출력하는 간단한 함수 본문을 내보내고 두 번째 매개 변수를 메서드의 반환 값으로 사용합니다. 이 예제에서는 대리자를 만들어 메서드를 완료하고, 다른 매개 변수를 사용하여 대리자를 호출하고, 마지막으로 메서드를 사용하여 동적 메서드를 Invoke 호출합니다.

using namespace System;
using namespace System::Reflection;
using namespace System::Reflection::Emit;

public ref class Test
{   
};

// Declare a delegate that will be used to execute the completed
// dynamic method.
delegate int HelloInvoker(String^ msg, int ret);

int main()
{
    // Create an array that specifies the types of the parameters
    // of the dynamic method. This method has a string parameter
    // and an int parameter.
    array<Type^>^ helloArgs = {String::typeid, int::typeid};

    // Create a dynamic method with the name "Hello", a return type
    // of int, and two parameters whose types are specified by the
    // array helloArgs. Create the method in the module that
    // defines the Test class.
    DynamicMethod^ hello = gcnew DynamicMethod("Hello", 
        int::typeid,
        helloArgs,
        Test::typeid->Module);

    // Create an array that specifies the parameter types of the
    // overload of Console.WriteLine to be used in Hello.
    array<Type^>^ writeStringArgs = {String::typeid};
    // Get the overload of Console.WriteLine that has one
    // String parameter.
    MethodInfo^ writeString =
        Console::typeid->GetMethod("WriteLine", writeStringArgs);

    // Get an ILGenerator and emit a body for the dynamic method.
    ILGenerator^ ilgen = hello->GetILGenerator();
    // Load the first argument, which is a string, onto the stack.
    ilgen->Emit(OpCodes::Ldarg_0);
    // Call the overload of Console.WriteLine that prints a string.
    ilgen->EmitCall(OpCodes::Call, writeString, nullptr);
    // The Hello method returns the value of the second argument;
    // to do this, load the onto the stack and return.
    ilgen->Emit(OpCodes::Ldarg_1);
    ilgen->Emit(OpCodes::Ret);

    // Create a delegate that represents the dynamic method. This
    // action completes the method, and any further attempts to
    // change the method will cause an exception.
    HelloInvoker^ helloDelegate =
        (HelloInvoker^) hello->CreateDelegate(HelloInvoker::typeid);

    // Use the delegate to execute the dynamic method. Save and
    // print the return value.
    int returnValue = helloDelegate("\r\nHello, World!", 42);
    Console::WriteLine("helloDelegate(\"Hello, World!\", 42) returned {0}",
        returnValue);

    // Do it again, with different arguments.
    returnValue = helloDelegate("\r\nHi, Mom!", 5280);
    Console::WriteLine("helloDelegate(\"Hi, Mom!\", 5280) returned {0}",
        returnValue);

    // Create an array of arguments to use with the Invoke method.
    array<Object^>^ delegateArgs = {"\r\nHello, World!", 42};
    // Invoke the dynamic method using the arguments. This is much
    // slower than using the delegate, because you must create an
    // array to contain the arguments, and ValueType arguments
    // must be boxed.
    Object^ returnValueObject = hello->Invoke(nullptr, delegateArgs);
    Console::WriteLine("hello.Invoke returned {0}", returnValueObject);
}

using System;
using System.Reflection;
using System.Reflection.Emit;
using Microsoft.VisualBasic;

public class Test
{
    // Declare a delegate that will be used to execute the completed
    // dynamic method.
    private delegate int HelloInvoker(string msg, int ret);

    public static void Main()
    {
        // Create an array that specifies the types of the parameters
        // of the dynamic method. This method has a string parameter
        // and an int parameter.
        Type[] helloArgs = {typeof(string), typeof(int)};

        // Create a dynamic method with the name "Hello", a return type
        // of int, and two parameters whose types are specified by the
        // array helloArgs. Create the method in the module that
        // defines the Test class.
        DynamicMethod hello = new DynamicMethod("Hello",
            typeof(int),
            helloArgs,
            typeof(Test).Module);

        // Create an array that specifies the parameter types of the
        // overload of Console.WriteLine to be used in Hello.
        Type[] writeStringArgs = {typeof(string)};
        // Get the overload of Console.WriteLine that has one
        // String parameter.
        MethodInfo writeString =
            typeof(Console).GetMethod("WriteLine", writeStringArgs);

        // Get an ILGenerator and emit a body for the dynamic method.
        ILGenerator il = hello.GetILGenerator();
        // Load the first argument, which is a string, onto the stack.
        il.Emit(OpCodes.Ldarg_0);
        // Call the overload of Console.WriteLine that prints a string.
        il.EmitCall(OpCodes.Call, writeString, null);
        // The Hello method returns the value of the second argument;
        // to do this, load the onto the stack and return.
        il.Emit(OpCodes.Ldarg_1);
        il.Emit(OpCodes.Ret);

        // Create a delegate that represents the dynamic method. This
        // action completes the method, and any further attempts to
        // change the method will cause an exception.
        HelloInvoker hi =
            (HelloInvoker) hello.CreateDelegate(typeof(HelloInvoker));

        // Use the delegate to execute the dynamic method. Save and
        // print the return value.
        int retval = hi("\r\nHello, World!", 42);
        Console.WriteLine("Executing delegate hi(\"Hello, World!\", 42) returned {0}",
            retval);

        // Do it again, with different arguments.
        retval = hi("\r\nHi, Mom!", 5280);
        Console.WriteLine("Executing delegate hi(\"Hi, Mom!\", 5280) returned {0}",
            retval);

        // Create an array of arguments to use with the Invoke method.
        object[] invokeArgs = {"\r\nHello, World!", 42};
        // Invoke the dynamic method using the arguments. This is much
        // slower than using the delegate, because you must create an
        // array to contain the arguments, and ValueType arguments
        // must be boxed.
        object objRet = hello.Invoke(null, invokeArgs);
        Console.WriteLine("hello.Invoke returned {0}", objRet);
    }
}

Imports System.Reflection
Imports System.Reflection.Emit

Public Class Test
    ' Declare a delegate that will be used to execute the completed
    ' dynamic method. 
    Private Delegate Function HelloInvoker(ByVal msg As String, _
        ByVal ret As Integer) As Integer

    Public Shared Sub Main()
        ' Create an array that specifies the types of the parameters
        ' of the dynamic method. This method has a String parameter
        ' and an Integer parameter.
        Dim helloArgs() As Type = {GetType(String), GetType(Integer)}

        ' Create a dynamic method with the name "Hello", a return type
        ' of Integer, and two parameters whose types are specified by
        ' the array helloArgs. Create the method in the module that
        ' defines the Test class.
        Dim hello As New DynamicMethod("Hello", _
            GetType(Integer), _
            helloArgs, _
            GetType(Test).Module)

        ' Create an array that specifies the parameter types of the
        ' overload of Console.WriteLine to be used in Hello.
        Dim writeStringArgs() As Type = {GetType(String)}
        ' Get the overload of Console.WriteLine that has one
        ' String parameter.
        Dim writeString As MethodInfo = GetType(Console). _
            GetMethod("WriteLine", writeStringArgs) 

        ' Get an ILGenerator and emit a body for the dynamic method.
        Dim il As ILGenerator = hello.GetILGenerator()
        ' Load the first argument, which is a string, onto the stack.
        il.Emit(OpCodes.Ldarg_0)
        ' Call the overload of Console.WriteLine that prints a string.
        il.EmitCall(OpCodes.Call, writeString, Nothing)
        ' The Hello method returns the value of the second argument;
        ' to do this, load the onto the stack and return.
        il.Emit(OpCodes.Ldarg_1)
        il.Emit(OpCodes.Ret)

        ' Create a delegate that represents the dynamic method. This
        ' action completes the method, and any further attempts to
        ' change the method will cause an exception.
    Dim hi As HelloInvoker = _
            hello.CreateDelegate(GetType(HelloInvoker))

        ' Use the delegate to execute the dynamic method. Save and
        ' print the return value.
        Dim retval As Integer = hi(vbCrLf & "Hello, World!", 42)
        Console.WriteLine("Executing delegate hi(""Hello, World!"", 42) returned " _
            & retval)

        ' Do it again, with different arguments.
        retval = hi(vbCrLf & "Hi, Mom!", 5280)
        Console.WriteLine("Executing delegate hi(""Hi, Mom!"", 5280) returned " _
            & retval)

        ' Create an array of arguments to use with the Invoke method.
        Dim invokeArgs() As Object = {vbCrLf & "Hello, World!", 42}
        ' Invoke the dynamic method using the arguments. This is much
        ' slower than using the delegate, because you must create an
        ' array to contain the arguments, and ValueType arguments
        ' must be boxed. Note that this overload of Invoke is 
        ' inherited from MethodBase, and simply calls the more 
        ' complete overload of Invoke.
        Dim objRet As Object = hello.Invoke(Nothing, invokeArgs)
        Console.WriteLine("hello.Invoke returned " & objRet)
    End Sub
End Class

' This code example produces the following output:
'
'Hello, World!
'Executing delegate hi("Hello, World!", 42) returned 42
'
'Hi, Mom!
'Executing delegate hi("Hi, Mom!", 5280) returned 5280
'
'Hello, World!
'hello.Invoke returned 42
'

설명

CreateDelegate 메서드 또는 메서드를 호출하면 Invoke 동적 메서드가 완료됩니다. 매개 변수 정의를 수정하거나 MSIL(Microsoft Intermediate Language)을 더 내보내는 등 동적 메서드를 변경하려는 추가 시도는 무시됩니다. 예외가 throw되지 않습니다.

고유한 MSIL 생성기가 있는 경우 동적 메서드에 대한 메서드 본문을 만들려면 메서드를 GetDynamicILInfo 호출하여 개체를 DynamicILInfo 가져옵니다. 고유한 MSIL 생성기가 없는 경우 메서드를 GetILGenerator 호출하여 메서드 본문을 생성하는 데 사용할 수 있는 개체를 가져옵니다 ILGenerator .

추가 정보

• 방법: 동적 메서드 정의 및 실행

Source:

DynamicMethod.cs

Source:

DynamicMethod.CoreCLR.cs

Source:

DynamicMethod.CoreCLR.cs

public:
 override Delegate ^ CreateDelegate(Type ^ delegateType, System::Object ^ target);

public:
 Delegate ^ CreateDelegate(Type ^ delegateType, System::Object ^ target);

public override sealed Delegate CreateDelegate (Type delegateType, object? target);

public override sealed Delegate CreateDelegate (Type delegateType, object target);

[System.Runtime.InteropServices.ComVisible(true)]
public Delegate CreateDelegate (Type delegateType, object target);

[System.Runtime.InteropServices.ComVisible(true)]
public override sealed Delegate CreateDelegate (Type delegateType, object target);

override this.CreateDelegate : Type * obj -> Delegate

[<System.Runtime.InteropServices.ComVisible(true)>]
member this.CreateDelegate : Type * obj -> Delegate

[<System.Runtime.InteropServices.ComVisible(true)>]
override this.CreateDelegate : Type * obj -> Delegate

Public Overrides NotOverridable Function CreateDelegate (delegateType As Type, target As Object) As Delegate

Public Function CreateDelegate (delegateType As Type, target As Object) As Delegate

매개 변수

반환

지정된 형식의 대리자로, 지정된 대상 개체를 사용하여 동적 메서드를 실행하는 데 사용할 수 있습니다.

특성

ComVisibleAttribute

예외

예제

다음 코드 예제에서는 바인딩하는 대리자를 DynamicMethod 만듭니다 형식의 instance 메서드는 호출 될 때마다 동일한 instance 작동 합니다.

이 코드 예제에서는 프라이빗 필드가 있는 라는 Example 클래스, 첫 번째 클래스에서 파생되는 라는 DerivedFromExample 클래스, 형식 및 의 매개 변수를 반환 Int32 하고 포함하는 라는 UseLikeStatic 대리자 형식Example, Int32형식의 Int32매개 변수를 반환하고 포함하는 대리 UseLikeInstanceInt32 자 형식을 정의합니다.

그런 다음, 예제 코드는 의 instance Example 프라이빗 필드를 변경하고 이전 값을 반환하는 을 만듭니다DynamicMethod.

예제 코드는 의 instance Example 만든 다음 두 개의 대리자를 만듭니다. 첫 번째는 동적 메서드와 동일한 매개 변수를 포함하는 형식 UseLikeStatic입니다. 두 번째는 형식 UseLikeInstance이며 첫 번째 매개 변수(형식 Example)가 없습니다. 이 대리자는 메서드 오버로드를 CreateDelegate(Type, Object) 사용하여 만들어집니다. 해당 메서드 오버로드의 두 번째 매개 변수는 의 Exampleinstance, 이 경우 방금 만든 instance 새로 만든 대리자에게 바인딩됩니다. 해당 대리자를 호출할 때마다 동적 메서드는 의 Example바인딩된 instance 작동합니다.

UseLikeStatic 대리자를 호출하여 대리자의 instance ExampleUseLikeInstance 전달합니다. 그런 다음 대리자를 UseLikeInstance 호출하여 두 대리자 모두 의 동일한 instance Example작동합니다. 내부 필드 값의 변경 내용은 각 호출 후에 표시됩니다. 마지막으로 대리자는 UseLikeInstance 의 instance DerivedFromExample바인딩되고 대리자 호출이 반복됩니다.

using System;
using System.Reflection;
using System.Reflection.Emit;

// These classes are for demonstration purposes.
//
public class Example
{
    private int id = 0;
    public Example(int id)
    {
        this.id = id;
    }
    public int ID { get { return id; }}
}

public class DerivedFromExample : Example
{
    public DerivedFromExample(int id) : base(id) {}
}

// Two delegates are declared: UseLikeInstance treats the dynamic
// method as if it were an instance method, and UseLikeStatic
// treats the dynamic method in the ordinary fashion.
//
public delegate int UseLikeInstance(int newID);
public delegate int UseLikeStatic(Example ex, int newID);

public class Demo
{
    public static void Main()
    {
        // This dynamic method changes the private id field. It has
        // no name; it returns the old id value (return type int);
        // it takes two parameters, an instance of Example and
        // an int that is the new value of id; and it is declared
        // with Example as the owner type, so it can access all
        // members, public and private.
        //
        DynamicMethod changeID = new DynamicMethod(
            "",
            typeof(int),
            new Type[] { typeof(Example), typeof(int) },
            typeof(Example)
        );

        // Get a FieldInfo for the private field 'id'.
        FieldInfo fid = typeof(Example).GetField(
            "id",
            BindingFlags.NonPublic | BindingFlags.Instance
        );

        ILGenerator ilg = changeID.GetILGenerator();

        // Push the current value of the id field onto the
        // evaluation stack. It's an instance field, so load the
        // instance of Example before accessing the field.
        ilg.Emit(OpCodes.Ldarg_0);
        ilg.Emit(OpCodes.Ldfld, fid);

        // Load the instance of Example again, load the new value
        // of id, and store the new field value.
        ilg.Emit(OpCodes.Ldarg_0);
        ilg.Emit(OpCodes.Ldarg_1);
        ilg.Emit(OpCodes.Stfld, fid);

        // The original value of the id field is now the only
        // thing on the stack, so return from the call.
        ilg.Emit(OpCodes.Ret);

        // Create a delegate that uses changeID in the ordinary
        // way, as a static method that takes an instance of
        // Example and an int.
        //
        UseLikeStatic uls =
            (UseLikeStatic) changeID.CreateDelegate(
                typeof(UseLikeStatic)
            );

        // Create an instance of Example with an id of 42.
        //
        Example ex = new Example(42);

        // Create a delegate that is bound to the instance of
        // of Example. This is possible because the first
        // parameter of changeID is of type Example. The
        // delegate has all the parameters of changeID except
        // the first.
        UseLikeInstance uli =
            (UseLikeInstance) changeID.CreateDelegate(
                typeof(UseLikeInstance),
                ex
            );

        // First, change the value of id by calling changeID as
        // a static method, passing in the instance of Example.
        //
        Console.WriteLine(
            "Change the value of id; previous value: {0}",
            uls(ex, 1492)
        );

        // Change the value of id again using the delegate bound
        // to the instance of Example.
        //
        Console.WriteLine(
            "Change the value of id; previous value: {0}",
            uli(2700)
        );

        Console.WriteLine("Final value of id: {0}", ex.ID);

        // Now repeat the process with a class that derives
        // from Example.
        //
        DerivedFromExample dfex = new DerivedFromExample(71);

        uli = (UseLikeInstance) changeID.CreateDelegate(
                typeof(UseLikeInstance),
                dfex
            );

        Console.WriteLine(
            "Change the value of id; previous value: {0}",
            uls(dfex, 73)
        );
        Console.WriteLine(
            "Change the value of id; previous value: {0}",
            uli(79)
        );
        Console.WriteLine("Final value of id: {0}", dfex.ID);
    }
}

/* This code example produces the following output:

Change the value of id; previous value: 42
Change the value of id; previous value: 1492
Final value of id: 2700
Change the value of id; previous value: 71
Change the value of id; previous value: 73
Final value of id: 79
 */

Imports System.Reflection
Imports System.Reflection.Emit

' These classes are for demonstration purposes.
'
Public Class Example
    Private _id As Integer = 0
    
    Public Sub New(ByVal newId As Integer) 
        _id = newId    
    End Sub
    
    Public ReadOnly Property ID() As Integer 
        Get
            Return _id
        End Get
    End Property 
End Class

Public Class DerivedFromExample
    Inherits Example
    
    Public Sub New(ByVal newId As Integer) 
        MyBase.New(newId)
    End Sub
End Class
 
' Two delegates are declared: UseLikeInstance treats the dynamic
' method as if it were an instance method, and UseLikeStatic
' treats the dynamic method in the ordinary fashion.
' 
Public Delegate Function UseLikeInstance(ByVal newID As Integer) _
    As Integer 
Public Delegate Function UseLikeStatic(ByVal ex As Example, _
    ByVal newID As Integer) As Integer 

Public Class Demo
    
    Public Shared Sub Main() 
        ' This dynamic method changes the private _id field. It 
        ' has no name; it returns the old _id value (return type 
        ' Integer); it takes two parameters, an instance of Example 
        ' and an Integer that is the new value of _id; and it is 
        ' declared with Example as the owner type, so it can 
        ' access all members, public and private.
        '
        Dim changeID As New DynamicMethod( _
            "", _
            GetType(Integer), _
            New Type() {GetType(Example), GetType(Integer)}, _
            GetType(Example) _
        )
        
        ' Get a FieldInfo for the private field '_id'.
        Dim fid As FieldInfo = GetType(Example).GetField( _
            "_id", _
            BindingFlags.NonPublic Or BindingFlags.Instance _
        )
        
        Dim ilg As ILGenerator = changeID.GetILGenerator()
        
        ' Push the current value of the id field onto the 
        ' evaluation stack. It's an instance field, so load the
        ' instance of Example before accessing the field.
        ilg.Emit(OpCodes.Ldarg_0)
        ilg.Emit(OpCodes.Ldfld, fid)
        
        ' Load the instance of Example again, load the new value 
        ' of id, and store the new field value. 
        ilg.Emit(OpCodes.Ldarg_0)
        ilg.Emit(OpCodes.Ldarg_1)
        ilg.Emit(OpCodes.Stfld, fid)
        
        ' The original value of the id field is now the only 
        ' thing on the stack, so return from the call.
        ilg.Emit(OpCodes.Ret)
        
        
        ' Create a delegate that uses changeID in the ordinary
        ' way, as a static method that takes an instance of
        ' Example and an Integer.
        '
        Dim uls As UseLikeStatic = CType( _
            changeID.CreateDelegate(GetType(UseLikeStatic)), _
            UseLikeStatic _
        )
        
        ' Create an instance of Example with an id of 42.
        '
        Dim ex As New Example(42)
        
        ' Create a delegate that is bound to the instance of 
        ' of Example. This is possible because the first 
        ' parameter of changeID is of type Example. The 
        ' delegate has all the parameters of changeID except
        ' the first.
        Dim uli As UseLikeInstance = CType( _
            changeID.CreateDelegate( _
                GetType(UseLikeInstance), _
                ex), _
            UseLikeInstance _
        )
        
        ' First, change the value of _id by calling changeID as
        ' a static method, passing in the instance of Example.
        '
        Console.WriteLine( _
            "Change the value of _id; previous value: {0}", _
            uls(ex, 1492) _
        )
        
        ' Change the value of _id again using the delegate 
        ' bound to the instance of Example.
        '
        Console.WriteLine( _
            "Change the value of _id; previous value: {0}", _
            uli(2700) _
        )
        
        Console.WriteLine("Final value of _id: {0}", ex.ID)
    

        ' Now repeat the process with a class that derives
        ' from Example.
        '
        Dim dfex As New DerivedFromExample(71)

        uli = CType( _
            changeID.CreateDelegate( _
                GetType(UseLikeInstance), _
                dfex), _
            UseLikeInstance _
        )

        Console.WriteLine( _
            "Change the value of _id; previous value: {0}", _
            uls(dfex, 73) _
        )
        Console.WriteLine( _
            "Change the value of _id; previous value: {0}", _
            uli(79) _
        )
        Console.WriteLine("Final value of _id: {0}", dfex.ID)

    End Sub
End Class

' This code example produces the following output:
'
'Change the value of _id; previous value: 42
'Change the value of _id; previous value: 1492
'Final value of _id: 2700
'Change the value of _id; previous value: 71
'Change the value of _id; previous value: 73
'Final value of _id: 79'

설명

이 메서드 오버로드는 특정 개체에 바인딩된 대리자를 만듭니다. 이러한 대리자는 첫 번째 인수를 통해 닫혀 있다고합니다. 메서드는 정적이지만 instance 메서드인 것처럼 작동합니다. instance 입니다target.

이 메서드 오버로드를 target 사용하려면 동적 메서드의 첫 번째 매개 변수와 형식이 동일하거나 해당 형식에 할당할 수 있어야 합니다(예: 파생 클래스). 의 delegateType 서명에는 첫 번째 를 제외한 동적 메서드의 모든 매개 변수가 있습니다. 예를 들어 동적 메서드에 , 및 BytedelegateType 매개 변수가 있는 경우 매개 변수 Int32Int32String가 있고 Byte는 target 형식String입니다.

CreateDelegate 메서드 또는 메서드를 호출하면 Invoke 동적 메서드가 완료됩니다. 매개 변수 정의를 수정하거나 MSIL(Microsoft Intermediate Language)을 더 내보내는 등 동적 메서드를 변경하려는 추가 시도는 무시됩니다. 예외가 throw되지 않습니다.

고유한 MSIL 생성기가 있는 경우 동적 메서드에 대한 메서드 본문을 만들려면 메서드를 GetDynamicILInfo 호출하여 개체를 DynamicILInfo 가져옵니다. 고유한 MSIL 생성기가 없는 경우 메서드를 GetILGenerator 호출하여 메서드 본문을 생성하는 데 사용할 수 있는 개체를 가져옵니다 ILGenerator .