ComponentEventHandler 委托
重要
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表示将处理为组件级事件引发的下列事件的方法：ComponentAdding、ComponentAdded、ComponentRemoving 和 ComponentRemoved。
public delegate void ComponentEventHandler(System::Object ^ sender, ComponentEventArgs ^ e);C#
public delegate void ComponentEventHandler(object sender, ComponentEventArgs e);C#
public delegate void ComponentEventHandler(object? sender, ComponentEventArgs e);C#
[System.Runtime.InteropServices.ComVisible(true)]
public delegate void ComponentEventHandler(object sender, ComponentEventArgs e);type ComponentEventHandler = delegate of obj * ComponentEventArgs -> unit[<System.Runtime.InteropServices.ComVisible(true)>]
type ComponentEventHandler = delegate of obj * ComponentEventArgs -> unitPublic Delegate Sub ComponentEventHandler(sender As Object, e As ComponentEventArgs)- sender
- Object
事件源。
包含事件数据的 ComponentEventArgs。
- 属性
以下示例演示如何注册 ComponentEventHandler 并处理 ComponentAdded、 ComponentAddingComponentRemoved 和 ComponentRemoving 事件。
public:
void LinkComponentEvent( IComponentChangeService^ changeService )
{
// Registers an event handler for the ComponentAdded,
// ComponentAdding, ComponentRemoved, and ComponentRemoving events.
changeService->ComponentAdded += gcnew ComponentEventHandler(
this, &ComponentEventHandlerExample::OnComponentEvent );
changeService->ComponentAdding += gcnew ComponentEventHandler(
this, &ComponentEventHandlerExample::OnComponentEvent );
changeService->ComponentRemoved += gcnew ComponentEventHandler(
this, &ComponentEventHandlerExample::OnComponentEvent );
changeService->ComponentRemoving += gcnew ComponentEventHandler(
this, &ComponentEventHandlerExample::OnComponentEvent );
}
private:
void OnComponentEvent( Object^ sender, ComponentEventArgs^ e )
{
// Displays changed component information on the console.
if ( e->Component->Site != nullptr )
{
Console::WriteLine( "Name of the component related to the event: " +
e->Component->Site->Name );
}
Console::WriteLine( "Type of the component related to the event: " +
e->Component->GetType()->FullName );
}
C#
public void LinkComponentEvent(IComponentChangeService changeService)
{
// Registers an event handler for the ComponentAdded,
// ComponentAdding, ComponentRemoved, and ComponentRemoving events.
changeService.ComponentAdded += new ComponentEventHandler(this.OnComponentEvent);
changeService.ComponentAdding += new ComponentEventHandler(this.OnComponentEvent);
changeService.ComponentRemoved += new ComponentEventHandler(this.OnComponentEvent);
changeService.ComponentRemoving += new ComponentEventHandler(this.OnComponentEvent);
}
private void OnComponentEvent(object sender, ComponentEventArgs e)
{
// Displays changed component information on the console.
if( e.Component.Site != null )
Console.WriteLine("Name of the component related to the event: "+e.Component.Site.Name);
Console.WriteLine("Type of the component related to the event: "+e.Component.GetType().FullName);
}
Public Sub LinkComponentEvent(ByVal changeService As IComponentChangeService)
' Registers an event handler for the ComponentAdded,
' ComponentAdding, ComponentRemoved, and ComponentRemoving events.
AddHandler changeService.ComponentAdded, AddressOf Me.OnComponentEvent
AddHandler changeService.ComponentAdding, AddressOf Me.OnComponentEvent
AddHandler changeService.ComponentRemoved, AddressOf Me.OnComponentEvent
AddHandler changeService.ComponentRemoving, AddressOf Me.OnComponentEvent
End Sub
Private Sub OnComponentEvent(ByVal sender As Object, ByVal e As ComponentEventArgs)
' Displays changed component information on the console.
If (e.Component.Site IsNot Nothing) Then
Console.WriteLine(("Name of the component related to the event: " + e.Component.Site.Name))
End If
End Sub
创建 ComponentEventHandler 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 |
