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DetailsViewDeletedEventHandler Delegasikan

Definisi

Mewakili metode yang menangani ItemDeleted peristiwa DetailsView kontrol.

public delegate void DetailsViewDeletedEventHandler(System::Object ^ sender, DetailsViewDeletedEventArgs ^ e);
public delegate void DetailsViewDeletedEventHandler(object sender, DetailsViewDeletedEventArgs e);
type DetailsViewDeletedEventHandler = delegate of obj * DetailsViewDeletedEventArgs -> unit
Public Delegate Sub DetailsViewDeletedEventHandler(sender As Object, e As DetailsViewDeletedEventArgs)

Parameter

sender
Object

Sumber dari peristiwa tersebut.

Contoh

Contoh kode berikut menunjukkan cara menambahkan DetailsViewDeletedEventHandler delegasi secara terprogram ke ItemDeleted peristiwa DetailsView kontrol.


<%@ page language="C#"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
  
  <script runat="server">
  
    void Page_Load(Object sender, EventArgs e)
    {
      
      // Create a new DetailsView object.
      DetailsView customerDetailsView = new DetailsView();
      
      // Set the DetailsView object's properties.
      customerDetailsView.ID = "CustomerDetailsView";
      customerDetailsView.DataSourceID = "DetailsViewSource";
      customerDetailsView.AutoGenerateRows = true;
      customerDetailsView.AutoGenerateDeleteButton = true;
      customerDetailsView.AllowPaging = true;
      customerDetailsView.PagerSettings.Mode = 
        PagerButtons.NextPrevious;
      customerDetailsView.DataKeyNames = new String[1] { "CustomerID" };

      // Programmatically register the event-handling method
      // for the ItemDeleted event of a DetailsView control.
      customerDetailsView.ItemDeleted += 
        new DetailsViewDeletedEventHandler(
        this.CustomerDetailView_ItemDeleted);

      // Add the DetailsView object to the Controls collection
      // of the PlaceHolder control.
      DetailsViewPlaceHolder.Controls.Add(customerDetailsView);

    }

    void CustomerDetailView_ItemDeleted(Object sender, 
      DetailsViewDeletedEventArgs e)
    {
      // Use the Exception property to determine whether an exception
      // occurred during the delete operation.
      if (e.Exception == null)
      {
        // Use the AffectedRows property to determine the numbers of
        // rows affected by the delete operation.
        if (e.AffectedRows == 1)
        {
          MessageLabel.Text = e.AffectedRows.ToString() 
            + " record deleted successfully.";
        }
        else
        {
          MessageLabel.Text = e.AffectedRows.ToString() 
            + " records deleted successfully.";
        }
      }
      else
      {
        // Insert the code to handle the exception.
        MessageLabel.Text = e.Exception.Message;

        // Use the ExceptionHandled property to indicate that the 
        // exception is already handled.
        e.ExceptionHandled = true;
      }
    }
  
  </script>
    
  <head runat="server">
    <title>DetailsViewDeletedEventHandler Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>DetailsViewDeletedEventHandler Example</h3>
        
        <!-- Use a PlaceHolder control as the container for the -->
        <!-- dynamically generated DetailsView control.         -->       
        <asp:PlaceHolder id="DetailsViewPlaceHolder"
          runat="server"/>
          
        <br/><br/>
        
        <asp:label id="MessageLabel"
          forecolor="Red"
          runat="server"/>
            
        <!-- This example uses Microsoft SQL Server and connects  -->
        <!-- to the Northwind sample database. Use an ASP.NET     -->
        <!-- expression to retrieve the connection string value   -->
        <!-- from the web.config file.                            -->
        <asp:sqldatasource id="DetailsViewSource"
          selectcommand="Select [CustomerID], [CompanyName], [Address], 
            [City], [PostalCode], [Country] From [Customers]"
          deletecommand="Delete [Customers] 
            Where [CustomerID]=@CustomerID"
          connectionstring=
            "<%$ ConnectionStrings:NorthWindConnectionString%>" 
          runat="server"/>
            
      </form>
  </body>
</html>

<%@ page language="VB"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
  
  <script runat="server">
  
    Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
      
      ' Create a new DetailsView object.
      Dim customerDetailsView As New DetailsView()
      
      ' Set the DetailsView object's properties.
      customerDetailsView.ID = "CustomerDetailsView"
      customerDetailsView.DataSourceID = "DetailsViewSource"
      customerDetailsView.AutoGenerateRows = True
      customerDetailsView.AutoGenerateDeleteButton = True
      customerDetailsView.AllowPaging = True
      customerDetailsView.PagerSettings.Mode = _
        PagerButtons.NextPrevious
      
      Dim keyArray() As String = {"CustomerID"}
      customerDetailsView.DataKeyNames = keyArray

      ' Programmatically register the event-handling method
      ' for the ItemDeleted event of a DetailsView control.
      AddHandler customerDetailsView.ItemDeleted, _
        AddressOf CustomerDetailView_ItemDeleted

      ' Add the DetailsView object to the Controls collection
      ' of the PlaceHolder control.
      DetailsViewPlaceHolder.Controls.Add(customerDetailsView)

    End Sub

    Sub CustomerDetailView_ItemDeleted(ByVal sender As Object, _
      ByVal e As DetailsViewDeletedEventArgs)
  
      ' Use the Exception property to determine whether an exception
      ' occurred during the delete operation.
      If e.Exception Is Nothing Then
    
        ' Use the AffectedRows property to determine the numbers of
        ' rows affected by the delete operation.
        If e.AffectedRows = 1 Then
      
          MessageLabel.Text = e.AffectedRows.ToString() _
            & " record deleted successfully."
      
        Else
              
          MessageLabel.Text = e.AffectedRows.ToString() _
            & " records deleted successfully."
      
        End If
    
      Else
    
        ' Insert the code to handle the exception.
        MessageLabel.Text = e.Exception.Message
      
        ' Use the ExceptionHandled property to indicate that the 
        ' exception is already handled.
        e.ExceptionHandled = True
    
      End If
    
    End Sub
  
  </script>
    
  <head runat="server">
    <title>DetailsViewDeletedEventHandler Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>DetailsViewDeletedEventHandler Example</h3>
        
        <!-- Use a PlaceHolder control as the container for the -->
        <!-- dynamically generated DetailsView control.         -->       
        <asp:PlaceHolder id="DetailsViewPlaceHolder"
          runat="server"/>
          
        <br/><br/>
        
        <asp:label id="MessageLabel"
          forecolor="Red"
          runat="server"/>
            
        <!-- This example uses Microsoft SQL Server and connects  -->
        <!-- to the Northwind sample database. Use an ASP.NET     -->
        <!-- expression to retrieve the connection string value   -->
        <!-- from the web.config file.                            -->
        <asp:sqldatasource id="DetailsViewSource"
          selectcommand="Select [CustomerID], [CompanyName], [Address], 
            [City], [PostalCode], [Country] From [Customers]"
          deletecommand="Delete [Customers] 
            Where [CustomerID]=@CustomerID"
          connectionstring=
            "<%$ ConnectionStrings:NorthWindConnectionString%>" 
          runat="server"/>
            
      </form>
  </body>
</html>

Contoh kode berikut menunjukkan cara menambahkan DetailsViewDeletedEventHandler delegasi secara deklaratif ke ItemDeleted peristiwa DetailsView kontrol.


<%@ page language="C#"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
  
  <script runat="server">

    void CustomerDetailView_ItemDeleted(Object sender, 
      DetailsViewDeletedEventArgs e)
    {
      // Use the Exception property to determine whether an exception
      // occurred during the delete operation.
      if (e.Exception == null)
      {
        // Use the AffectedRows property to determine the numbers of
        // rows affected by the delete operation.
        if (e.AffectedRows == 1)
        {
          MessageLabel.Text = e.AffectedRows.ToString() 
            + " record deleted successfully.";
        }
        else
        {
          MessageLabel.Text = e.AffectedRows.ToString() 
            + " records deleted successfully.";
        }
      }
      else
      {
        // Insert the code to handle the exception.
        MessageLabel.Text = e.Exception.Message;

        // Use the ExceptionHandled property to indicate that the 
        // exception is already handled.
        e.ExceptionHandled = true;
      }
    }
  
  </script>
    
  <head runat="server">
    <title>DetailsViewDeletedEventHandler Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>DetailsViewDeletedEventHandler Example</h3>
        
        <asp:detailsview id="CustomerDetailsView"
          datasourceid="DetailsViewSource"
          autogeneraterows="true"
          autogeneratedeletebutton="true"
          allowpaging="true"
          datakeynames="CustomerID" 
          runat="server">
        
          <pagersettings mode="NextPrevious"/>
        
        </asp:detailsview>
          
        <br/><br/>
        
        <asp:label id="MessageLabel"
          forecolor="Red"
          runat="server"/>
            
        <!-- This example uses Microsoft SQL Server and connects  -->
        <!-- to the Northwind sample database. Use an ASP.NET     -->
        <!-- expression to retrieve the connection string value   -->
        <!-- from the web.config file.                            -->
        <asp:sqldatasource id="DetailsViewSource"
          selectcommand="Select [CustomerID], [CompanyName], [Address], 
            [City], [PostalCode], [Country] From [Customers]"
          deletecommand="Delete [Customers] 
            Where [CustomerID]=@CustomerID"
          connectionstring=
            "<%$ ConnectionStrings:NorthWindConnectionString%>" 
          runat="server"/>
            
      </form>
  </body>
</html>

<%@ page language="VB"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
  
  <script runat="server">

    Sub CustomerDetailView_ItemDeleted(ByVal sender As Object, _
      ByVal e As DetailsViewDeletedEventArgs)
  
      ' Use the Exception property to determine whether an exception
      ' occurred during the delete operation.
      If e.Exception Is Nothing Then
    
        ' Use the AffectedRows property to determine the numbers of
        ' rows affected by the delete operation.
        If e.AffectedRows = 1 Then
      
          MessageLabel.Text = e.AffectedRows.ToString() _
            & " record deleted successfully."
      
        Else
              
          MessageLabel.Text = e.AffectedRows.ToString() _
            & " records deleted successfully."
      
        End If
    
      Else
    
        ' Insert the code to handle the exception.
        MessageLabel.Text = e.Exception.Message
      
        ' Use the ExceptionHandled property to indicate that the 
        ' exception is already handled.
        e.ExceptionHandled = True
    
      End If
    
    End Sub
  
  </script>
    
  <head runat="server">
    <title>DetailsViewDeletedEventHandler Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>DetailsViewDeletedEventHandler Example</h3>
        
        <asp:detailsview id="CustomerDetailsView"
          datasourceid="DetailsViewSource"
          autogeneraterows="true"
          autogeneratedeletebutton="true"
          allowpaging="true"
          datakeynames="CustomerID" 
          runat="server">
        
          <pagersettings mode="NextPrevious"/>
        
        </asp:detailsview>
          
        <br/><br/>
        
        <asp:label id="MessageLabel"
          forecolor="Red"
          runat="server"/>
            
        <!-- This example uses Microsoft SQL Server and connects  -->
        <!-- to the Northwind sample database. Use an ASP.NET     -->
        <!-- expression to retrieve the connection string value   -->
        <!-- from the web.config file.                            -->
        <asp:sqldatasource id="DetailsViewSource"
          selectcommand="Select [CustomerID], [CompanyName], [Address], 
            [City], [PostalCode], [Country] From [Customers]"
          deletecommand="Delete [Customers] 
            Where [CustomerID]=@CustomerID"
          connectionstring=
            "<%$ ConnectionStrings:NorthWindConnectionString%>" 
          runat="server"/>
            
      </form>
  </body>
</html>

Keterangan

Kontrol DetailsView menaikkan ItemDeleted peristiwa saat tombol Hapus (tombol dengan propertinya CommandName diatur ke "Hapus") dalam kontrol diklik, tetapi setelah DetailsView kontrol menghapus rekaman. Ini memungkinkan Anda untuk menyediakan penanganan aktivitas yang melakukan rutinitas kustom, seperti memeriksa hasil operasi penghapusan, setiap kali peristiwa ini terjadi.

Saat membuat DetailsViewDeletedEventHandler delegasi, Anda mengidentifikasi metode yang akan menangani peristiwa. Untuk mengaitkan peristiwa dengan penanganan aktivitas Anda, tambahkan instans delegasi ke peristiwa. Penanganan aktivitas dipanggil setiap kali peristiwa terjadi, kecuali Jika Anda menghapus delegasi. Untuk informasi selengkapnya tentang delegasi penanganan aktivitas, lihat Menangani dan Meningkatkan Peristiwa.

Metode Ekstensi

GetMethodInfo(Delegate)

Mendapatkan objek yang mewakili metode yang diwakili oleh delegasi yang ditentukan.

Berlaku untuk

Lihat juga