通过

IPostBackEventHandler 接口

  • 参考

定义

命名空间:
System.Web.UI
程序集:
System.Web.dll

定义 ASP.NET 服务器控件为处理回发事件而必须实现的方法。

public interface class IPostBackEventHandler
public interface IPostBackEventHandler
type IPostBackEventHandler = interface
Public Interface IPostBackEventHandler
派生

示例

下面的代码示例定义一个自定义按钮服务器控件，该控件会导致回发，使用 RaisePostBackEvent 方法捕获回发事件，并在服务器上引发 事件 Click 。

using System;
using System.Web.UI;
using System.Collections;
using System.Collections.Specialized;

namespace CustomControls {

   [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name="FullTrust")]
   public class MyButton: Control, IPostBackEventHandler {

      // Defines the Click event.
      public event EventHandler Click;

      //Invoke delegates registered with the Click event.
      protected virtual void OnClick(EventArgs e) {

         if (Click != null) {
            Click(this, e);
         }
      }

      // Define the method of IPostBackEventHandler that raises change events.
      public void RaisePostBackEvent(string eventArgument){

         OnClick(new EventArgs());
      }

      protected override void Render(HtmlTextWriter output) {
         output.Write("<INPUT TYPE = submit name = " + this.UniqueID +
            " Value = 'Click Me' />");
      }
   }
}

Imports System.Web.UI
Imports System.Collections
Imports System.Collections.Specialized

Namespace CustomControls    
    
    <System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.Demand, Name:="FullTrust")> 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

注解

若要创建从浏览器捕获表单提交信息的服务器控件，必须实现此接口。 有关如何使用此接口的详细信息，请参阅 ASP.NET Web 窗体页中的服务器事件处理。

方法

RaisePostBackEvent(String)

当由类实现时，使服务器控件能够处理将窗体发送到服务器时引发的事件。

适用于

另请参阅