2007年8月21日随笔档案 - Blue Sky

定义 ASP.NET 服务器控件为处理回发事件而必须实现的方法。

下面的代码示例定义一个自定义按钮服务器控件，该控件可引起回发，使用 RaisePostBackEvent 方法捕获回发，并在服务器上引发 Click 事件。（摘自MSDN）

Imports System

Imports System.Web.UI

Imports System.Collections

Imports System.Collections.Specialized

Namespace CustomControls

Public Class MyButton

Inherits Control

Implements IPostBackEventHandler

' Define the Click event.

Public Event Click As EventHandler

' Invoke delegates registered with the Click event.

Protected Overridable Sub OnClick(e As EventArgs)

RaiseEvent Click(Me, e)

End Sub

' Define the method of IPostBackEventHandler that raises change events.

Public Sub RaisePostBackEvent(eventArgument As String) _

Implements IPostBackEventHandler.RaisePostBackEvent

OnClick(New EventArgs())

End Sub

Protected Overrides Sub Render(output As HtmlTextWriter)

output.Write("<INPUT TYPE = submit name = " & Me.UniqueID & _

" Value = 'Click Me' />")

End Sub

End Class

End Namespace

keyword: IPostBackEventHandler ,RaisePostBackEvent,控件回发

posted @ 2007-08-21 21:50 Blue Sky 阅读(137) 评论(0) 编辑