CodeDelegateCreateExpression Classe

Definizione

public ref class CodeDelegateCreateExpression : System::CodeDom::CodeExpression

public class CodeDelegateCreateExpression : System.CodeDom.CodeExpression

[System.Runtime.InteropServices.ClassInterface(System.Runtime.InteropServices.ClassInterfaceType.AutoDispatch)]
[System.Runtime.InteropServices.ComVisible(true)]
[System.Serializable]
public class CodeDelegateCreateExpression : System.CodeDom.CodeExpression

type CodeDelegateCreateExpression = class
    inherit CodeExpression

[<System.Runtime.InteropServices.ClassInterface(System.Runtime.InteropServices.ClassInterfaceType.AutoDispatch)>]
[<System.Runtime.InteropServices.ComVisible(true)>]
[<System.Serializable>]
type CodeDelegateCreateExpression = class
    inherit CodeExpression

Public Class CodeDelegateCreateExpression
Inherits CodeExpression

Ereditarietà

Object

CodeObject

CodeExpression

CodeDelegateCreateExpression

Attributi

ClassInterfaceAttribute ComVisibleAttribute SerializableAttribute

Esempio

Il codice di esempio seguente usa un oggetto CodeDelegateCreateExpression per creare un delegato.

// Defines a delegate creation expression that creates an EventHandler delegate pointing to a method named TestMethod.
CodeDelegateCreateExpression^ createDelegate1 = gcnew CodeDelegateCreateExpression( gcnew CodeTypeReference( "System.EventHandler" ),gcnew CodeThisReferenceExpression,"TestMethod" );

// Attaches an EventHandler delegate pointing to TestMethod to the TestEvent event.
CodeAttachEventStatement^ attachStatement1 = gcnew CodeAttachEventStatement( gcnew CodeThisReferenceExpression,"TestEvent",createDelegate1 );

// A C# code generator produces the following source code for the preceeding example code:
//     this.TestEvent += new System.EventHandler(this.TestMethod);

// Defines a delegate creation expression that creates an EventHandler delegate pointing to a method named TestMethod.
CodeDelegateCreateExpression createDelegate1 = new CodeDelegateCreateExpression(
new CodeTypeReference( "System.EventHandler" ), new CodeThisReferenceExpression(), "TestMethod" );
// Attaches an EventHandler delegate pointing to TestMethod to the TestEvent event.
CodeAttachEventStatement attachStatement1 = new CodeAttachEventStatement( new CodeThisReferenceExpression(), "TestEvent", createDelegate1 );

// A C# code generator produces the following source code for the preceeding example code:

//     this.TestEvent += new System.EventHandler(this.TestMethod);

' Defines a delegate creation expression that creates an EventHandler delegate pointing to TestMethod.
Dim createDelegate1 As New CodeDelegateCreateExpression(New CodeTypeReference("System.EventHandler"), New CodeThisReferenceExpression(), "TestMethod")

' Attaches an EventHandler delegate pointing to TestMethod to the TestEvent event.
Dim attachStatement1 As New CodeAttachEventStatement(New CodeThisReferenceExpression(), "TestEvent", createDelegate1)

' A Visual Basic code generator produces the following source code for the preceeding example code:

'     AddHandler TestEvent, AddressOf Me.TestMethod

Commenti

CodeDelegateCreateExpression rappresenta il codice che crea un delegato. CodeDelegateCreateExpression viene spesso usato con CodeAttachEventStatement o CodeRemoveEventStatement per rappresentare un gestore eventi per collegare o rimuovere da un evento.

La DelegateType proprietà specifica il tipo di delegato da creare. La TargetObject proprietà indica l'oggetto che contiene il metodo del gestore eventi. La MethodName proprietà indica il nome del metodo del gestore eventi la cui firma del metodo corrisponde alla firma del metodo del delegato.

In C#, un'espressione di creazione del delegato è in genere nel formato seguente: new EventHandler(this.HandleEventMethod). In Visual Basic, un'espressione di creazione del delegato è in genere nel formato seguente: AddressOf Me.HandleEventMethod.

Costruttori

Proprietà

Metodi

Si applica a