IPostBackEventHandler.RaisePostBackEvent(String) 方法

public:
 void RaisePostBackEvent(System::String ^ eventArgument);

public void RaisePostBackEvent(string eventArgument);

abstract member RaisePostBackEvent : string -> unit

Public Sub RaisePostBackEvent (eventArgument As String)

参数

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

页面将 参数的值 eventArgument 传递给 RaisePostBackEvent 实现 IPostBackEventHandler 接口的控件的 方法。 此控件还呈现导致回发的 HTML 元素。 如果 控件呈现用于回发的客户端脚本，则脚本中的 参数将传递到 参数 eventArgument 中。 如果回发是由简单的提交操作引起的，则 eventArgument 参数为 null。

此方法为 HTML 和 Web 服务器控件实现的许多事件提供功能。

另请参阅

• ASP.NET 网页中的服务器事件处理