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IPostBackEventHandler Antarmuka

  • Referensi

Definisi

Ruang nama:
System.Web.UI
Rakitan:
System.Web.dll

Menentukan metode ASP.NET kontrol server harus diterapkan untuk menangani peristiwa postback.

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

Contoh

Contoh kode berikut mendefinisikan kontrol server tombol kustom yang menyebabkan postback, mengambil peristiwa postback menggunakan RaisePostBackEvent metode , dan menaikkan Click peristiwa di server.

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

Keterangan

Untuk membuat kontrol server yang mengambil informasi pengiriman formulir dari browser, Anda harus menerapkan antarmuka ini. Untuk informasi selengkapnya tentang cara menggunakan antarmuka ini, lihat Penanganan Peristiwa Server di Halaman Formulir Web ASP.NET.

Metode

RaisePostBackEvent(String)

Saat diimplementasikan oleh kelas, memungkinkan kontrol server untuk memproses peristiwa yang dimunculkan saat formulir diposting ke server.

Berlaku untuk

Lihat juga