DynamicMethod.CreateDelegate Metode
Definisi
Penting
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Menyelesaikan metode dinamis dan membuat delegasi yang dapat digunakan untuk menjalankannya.
Overload
CreateDelegate(Type) |
Menyelesaikan metode dinamis dan membuat delegasi yang dapat digunakan untuk menjalankannya. |
CreateDelegate(Type, Object) |
Menyelesaikan metode dinamis dan membuat delegasi yang dapat digunakan untuk menjalankannya, menentukan jenis delegasi dan objek yang terikat delegasi. |
CreateDelegate(Type)
- Sumber:
- DynamicMethod.cs
- Sumber:
- DynamicMethod.CoreCLR.cs
- Sumber:
- DynamicMethod.CoreCLR.cs
Menyelesaikan metode dinamis dan membuat delegasi yang dapat digunakan untuk menjalankannya.
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
Parameter
- delegateType
- Type
Jenis delegasi yang tanda tangannya cocok dengan metode dinamis.
Mengembalikan
Delegasi dari jenis yang ditentukan, yang dapat digunakan untuk menjalankan metode dinamis.
- Atribut
Pengecualian
Metode dinamis tidak memiliki isi metode.
delegateType
memiliki jumlah parameter yang salah atau jenis parameter yang salah.
Contoh
Contoh kode berikut membuat metode dinamis yang mengambil dua parameter. Contoh memancarkan isi fungsi sederhana yang mencetak parameter pertama ke konsol, dan contohnya menggunakan parameter kedua sebagai nilai pengembalian metode. Contoh menyelesaikan metode dengan membuat delegasi, memanggil delegasi dengan parameter yang berbeda, dan akhirnya memanggil metode dinamis menggunakan Invoke metode .
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
'
Keterangan
Memanggil CreateDelegate metode atau Invoke metode menyelesaikan metode dinamis. Setiap upaya lebih lanjut untuk mengubah metode dinamis, seperti memodifikasi definisi parameter atau memancarkan lebih banyak bahasa perantara Microsoft (MSIL), diabaikan; tidak ada pengecualian yang dilemparkan.
Untuk membuat isi metode untuk metode dinamis ketika Anda memiliki generator MSIL Anda sendiri, panggil GetDynamicILInfo metode untuk mendapatkan DynamicILInfo objek . Jika Anda tidak memiliki generator MSIL Anda sendiri, panggil GetILGenerator metode untuk mendapatkan ILGenerator objek yang dapat digunakan untuk menghasilkan isi metode.
Lihat juga
Berlaku untuk
CreateDelegate(Type, Object)
- Sumber:
- DynamicMethod.cs
- Sumber:
- DynamicMethod.CoreCLR.cs
- Sumber:
- DynamicMethod.CoreCLR.cs
Menyelesaikan metode dinamis dan membuat delegasi yang dapat digunakan untuk menjalankannya, menentukan jenis delegasi dan objek yang terikat delegasi.
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
Parameter
- delegateType
- Type
Jenis delegasi yang tanda tangannya cocok dengan metode dinamis, dikurangi parameter pertama.
- target
- Object
Objek yang diikat delegasi. Harus memiliki jenis yang sama dengan parameter pertama dari metode dinamis.
Mengembalikan
Delegasi dari jenis yang ditentukan, yang dapat digunakan untuk menjalankan metode dinamis dengan objek target yang ditentukan.
- Atribut
Pengecualian
Metode dinamis tidak memiliki isi metode.
target
bukan jenis yang sama dengan parameter pertama dari metode dinamis, dan tidak dapat ditetapkan ke jenis tersebut.
-atau-
delegateType
memiliki jumlah parameter yang salah atau jenis parameter yang salah.
Contoh
Contoh kode berikut membuat delegasi yang mengikat ke instans DynamicMethod jenis, sehingga metode bertindak pada instans yang sama setiap kali dipanggil.
Contoh kode mendefinisikan kelas bernama Example
dengan bidang privat, kelas bernama DerivedFromExample
yang berasal dari kelas pertama, jenis delegasi bernama UseLikeStatic
yang mengembalikan Int32 dan memiliki parameter jenis Example
dan Int32, dan jenis delegasi bernama UseLikeInstance
yang mengembalikan Int32 dan memiliki satu parameter jenis Int32.
Kode contoh kemudian membuat DynamicMethod yang mengubah bidang privat dari Example
instans dan mengembalikan nilai sebelumnya.
Catatan
Secara umum, mengubah bidang internal kelas bukanlah praktik pengkodean berorientasi objek yang baik.
Kode contoh membuat instans Example
lalu membuat dua delegasi. Yang pertama adalah jenis UseLikeStatic
, yang memiliki parameter yang sama dengan metode dinamis. Yang kedua adalah jenis UseLikeInstance
, yang tidak memiliki parameter pertama (dari jenis Example
). Delegasi ini dibuat menggunakan CreateDelegate(Type, Object) metode kelebihan beban; parameter kedua dari kelebihan metode tersebut adalah instans Example
, dalam hal ini instans yang baru saja dibuat, yang terikat ke delegasi yang baru dibuat. Setiap kali delegasi tersebut dipanggil, metode dinamis bertindak pada instans terikat dari Example
.
Catatan
Ini adalah contoh aturan yang dilonggarkan untuk mendelegasikan pengikatan yang diperkenalkan dalam .NET Framework 2.0, bersama dengan kelebihan beban baru metodeDelegate.CreateDelegate. Untuk informasi selengkapnya, lihat Delegate kelas.
UseLikeStatic
Delegasi dipanggil, meneruskan instans Example
yang terikat ke UseLikeInstance
delegasi.
UseLikeInstance
Kemudian delegasi dipanggil, sehingga kedua delegasi bertindak pada instans yang sama dari Example
. Perubahan nilai bidang internal ditampilkan setelah setiap panggilan. Akhirnya, UseLikeInstance
delegasi terikat ke instans DerivedFromExample
, dan panggilan delegasi diulang.
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'
Keterangan
Metode kelebihan beban ini membuat delegasi yang terikat ke objek tertentu. Delegasi semacam itu dikatakan ditutup atas argumen pertamanya. Meskipun metodenya statis, metode ini bertindak seolah-olah itu adalah metode instans; instansnya adalah target
.
Metode kelebihan beban ini harus target
memiliki jenis yang sama dengan parameter pertama dari metode dinamis, atau dapat ditetapkan ke jenis tersebut (misalnya, kelas turunan). Tanda tangan delegateType
memiliki semua parameter metode dinamis kecuali yang pertama. Misalnya, jika metode dinamis memiliki parameter String, , Int32dan Byte, maka delegateType
memiliki parameter dan Byte; target
berjenis Int32String.
Memanggil CreateDelegate metode atau Invoke metode menyelesaikan metode dinamis. Setiap upaya lebih lanjut untuk mengubah metode dinamis, seperti memodifikasi definisi parameter atau memancarkan lebih banyak bahasa perantara Microsoft (MSIL), diabaikan; tidak ada pengecualian yang dilemparkan.
Untuk membuat isi metode untuk metode dinamis ketika Anda memiliki generator MSIL Anda sendiri, panggil GetDynamicILInfo metode untuk mendapatkan DynamicILInfo objek . Jika Anda tidak memiliki generator MSIL Anda sendiri, panggil GetILGenerator metode untuk mendapatkan ILGenerator objek yang dapat digunakan untuk menghasilkan isi metode.