DesignerTransactionCloseEventHandler 委托
重要
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表示处理设计器的 TransactionClosed 和 TransactionClosing 事件的方法。
public delegate void DesignerTransactionCloseEventHandler(System::Object ^ sender, DesignerTransactionCloseEventArgs ^ e);C#
public delegate void DesignerTransactionCloseEventHandler(object sender, DesignerTransactionCloseEventArgs e);C#
public delegate void DesignerTransactionCloseEventHandler(object? sender, DesignerTransactionCloseEventArgs e);C#
[System.Runtime.InteropServices.ComVisible(true)]
public delegate void DesignerTransactionCloseEventHandler(object sender, DesignerTransactionCloseEventArgs e);type DesignerTransactionCloseEventHandler = delegate of obj * DesignerTransactionCloseEventArgs -> unit[<System.Runtime.InteropServices.ComVisible(true)>]
type DesignerTransactionCloseEventHandler = delegate of obj * DesignerTransactionCloseEventArgs -> unitPublic Delegate Sub DesignerTransactionCloseEventHandler(sender As Object, e As DesignerTransactionCloseEventArgs)- sender
- Object
事件源。
- 属性
以下示例演示如何注册 DesignerTransactionCloseEventHandler 并处理 TransactionClosing 和 TransactionClosed 事件。
public:
void LinkDesignerTransactionCloseEvent( IDesignerHost^ host )
{
// Registers an event handler for the designer TransactionClosing and TransactionClosed events.
host->TransactionClosing += gcnew DesignerTransactionCloseEventHandler(
this, &DesignerTransactionCloseEventHandlerExample::OnTransactionClose );
host->TransactionClosed += gcnew DesignerTransactionCloseEventHandler(
this, &DesignerTransactionCloseEventHandlerExample::OnTransactionClose );
}
private:
void OnTransactionClose( Object^ sender, DesignerTransactionCloseEventArgs^ e )
{
// Displays transaction close information on the console.
if ( e->TransactionCommitted )
{
Console::WriteLine( "Transaction has been committed." );
}
else
{
Console::WriteLine( "Transaction has not yet been committed." );
}
}
C#
public void LinkDesignerTransactionCloseEvent(IDesignerHost host)
{
// Registers an event handler for the designer TransactionClosing and TransactionClosed events.
host.TransactionClosing += new DesignerTransactionCloseEventHandler(this.OnTransactionClose);
host.TransactionClosed += new DesignerTransactionCloseEventHandler(this.OnTransactionClose);
}
private void OnTransactionClose(object sender, DesignerTransactionCloseEventArgs e)
{
// Displays transaction close information on the console.
if( e.TransactionCommitted )
Console.WriteLine("Transaction has been committed.");
else
Console.WriteLine("Transaction has not yet been committed.");
}
Public Sub LinkDesignerTransactionCloseEvent(ByVal host As IDesignerHost)
' Registers an event handler for the designer TransactionClosing
' and TransactionClosed events.
AddHandler host.TransactionClosing, AddressOf Me.OnTransactionClose
AddHandler host.TransactionClosed, AddressOf Me.OnTransactionClose
End Sub
Private Sub OnTransactionClose(ByVal sender As Object, ByVal e As DesignerTransactionCloseEventArgs)
' Displays transaction close information on the console.
If e.TransactionCommitted Then
Console.WriteLine("Transaction has been committed.")
Else
Console.WriteLine("Transaction has not yet been committed.")
End If
End Sub
创建 DesignerTransactionCloseEventHandler 委托时，需要标识将处理该事件的方法。 若要将事件与事件处理程序关联，请将该委托的一个实例添加到事件中。 除非移除了该委托，否则每当发生该事件时就会调用事件处理程序。 有关事件处理程序委托的详细信息，请参阅 处理和引发事件。
|
Get |
获取指示指定委托表示的方法的对象。 |
| 产品 | 版本 |
|---|---|
| .NET | Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
| .NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
| .NET Standard | 2.0, 2.1 |
