CodeAttachEventStatement クラスとは何？わかりやすく解説 Weblio辞書

.NET Framework クラスライブラリリファレンス

索引トップ用語の索引ランキング

CodeAttachEventStatement クラス

イベントハンドラのデリゲートをイベントに結び付けるステートメントを表します。

名前空間: System.CodeDom
アセンブリ: System (system.dll 内)
構文

Visual Basic (宣言)

<SerializableAttribute> _
<ComVisibleAttribute(True)> _
<ClassInterfaceAttribute(ClassInterfaceType.AutoDispatch)> _
Public Class CodeAttachEventStatement
    Inherits CodeStatement

Visual Basic (使用法)

Dim instance As CodeAttachEventStatement

[SerializableAttribute] 
[ComVisibleAttribute(true)] 
[ClassInterfaceAttribute(ClassInterfaceType.AutoDispatch)] 
public class CodeAttachEventStatement : CodeStatement

C++

[SerializableAttribute] 
[ComVisibleAttribute(true)] 
[ClassInterfaceAttribute(ClassInterfaceType::AutoDispatch)] 
public ref class CodeAttachEventStatement :
 public CodeStatement

/** @attribute SerializableAttribute() */ 
/** @attribute ComVisibleAttribute(true) */ 
/** @attribute ClassInterfaceAttribute(ClassInterfaceType.AutoDispatch) */ 
public class CodeAttachEventStatement extends
 CodeStatement

JScript

SerializableAttribute 
ComVisibleAttribute(true) 
ClassInterfaceAttribute(ClassInterfaceType.AutoDispatch) 
public class CodeAttachEventStatement extends
 CodeStatement

解説

CodeAttachEventStatement を使用して、イベントハンドラのデリゲートをイベントに追加するステートメントを表すことができます。Event プロパティは、イベントハンドラを結び付けるイベントを表します。Listener プロパティは、結びつけるイベントハンドラを表します。

使用例

CodeAttachEventStatement を使用してイベントハンドラをイベントに結び付ける方法を示すコード例を次に示します。

Visual Basic

' 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

// 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);

C++

// 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 VJ# code generator produces the following source code for the 
// preceeding example code:
// this.add_TestEvent(new System.EventHandler(this.TestMethod));