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)

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

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。

• ASP.NET 网页中的服务器事件处理