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DetailsViewCommandEventArgs.CommandSource Properti

  • Referensi

Definisi

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

Mendapatkan sumber perintah.

public:
 property System::Object ^ CommandSource { System::Object ^ get(); };
public object CommandSource { get; }
member this.CommandSource : obj
Public ReadOnly Property CommandSource As Object

Nilai Properti

Object

Instans Object kelas yang mewakili sumber perintah.

Contoh

Contoh kode berikut menunjukkan cara menggunakan CommandSource properti untuk menentukan kontrol DetailsView mana yang memunculkan ItemCommand peristiwa.

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

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
  
  void ItemDetailsView_ItemCommand(Object sender, 
    DetailsViewCommandEventArgs e)
  {

    // Use the CommandName property to determine which button
    // was clicked. 
    if (e.CommandName == "Add")
    {
      
      // Because this event handler is used for two different
      // DetailsView controls, use the CommandSource property 
      // to get the DetailsView control that raised the event.
      DetailsView view = (DetailsView)e.CommandSource;
      
      // Determine which ListBox control to update based on the
      // ID of the DetailsView control that raised the event.
      ListBox list;
      if (view.ID == "CustomerDetailsView")
      {
        list = CustomerListBox;
      }
      else
      {
        list = EmployeesListBox;
      }

      // Add the selected item to the appropriate ListBox control. 

      // Get the row that contains the value to add. For this
      // example, get the second row (index 1) of the DetailsView 
      // control.
      DetailsViewRow row = view.Rows[1];

      // Get the value from the appropriate cell. For this
      // example, get the value of the second cell (index 1) 
      // of the row.
      String value = row.Cells[1].Text;

      // Create a ListItem object using the value.
      ListItem item = new ListItem(value);

      // Add the ListItem object to the ListBox control, if the 
      // item does not already exist.
      if (!list.Items.Contains(item))
      {
        list.Items.Add(item);
      }

    }

  }
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>DetailsViewCommandEventArgs CommandSource Example</title>
</head>
<body>
    <form id="form1" runat="server">
    
      <h3>DetailsViewCommandEventArgs CommandSource Example</h3>
  
      <table border="0">
        <tr valign="top">
          <td>
            <asp:detailsview id="CustomerDetailsView"
              datasourceid="CustomerSource"
              allowpaging="true"
              autogeneraterows="true" 
              onitemcommand="ItemDetailsView_ItemCommand"  
              runat="server">
              <fields>
                <asp:buttonfield buttontype="Link"
                  causesvalidation="false"
                  text="Add to List"
                  commandname="Add"/>
              </fields>
            </asp:detailsview>
          </td>
          <td>
            <asp:detailsview id="EmployeesDetailsView"
              datasourceid="EmployeesSource"
              allowpaging="true"
              autogeneraterows="true" 
              onitemcommand="ItemDetailsView_ItemCommand"  
              runat="server">
              <fields>
                <asp:buttonfield buttontype="Link"
                  causesvalidation="false"
                  text="Add to List"
                  commandname="Add"/>
              </fields>
            </asp:detailsview>
          </td>
        </tr>
        <tr>
          <td>
            Selected Customers:<br/>
            <asp:listbox id="CustomerListBox"
              runat="server"/>
          </td>
          <td>
            Selected Employees:<br/>
            <asp:listbox id="EmployeesListBox"
              runat="server"/>
          </td>
        </tr>
      </table>
      
      <!-- 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="CustomerSource"
        selectcommand="Select [CustomerID], [CompanyName], [Address], 
          [City], [PostalCode], [Country] From [Customers]"
        connectionstring=
            "<%$ ConnectionStrings:NorthWindConnectionString%>" 
        runat="server"/>  
        
      <asp:sqldatasource id="EmployeesSource"
        selectcommand="Select [EmployeeID], [FirstName], [LastName], 
          [Title] From [Employees]"
        connectionstring=
            "<%$ ConnectionStrings:NorthWindConnectionString%>" 
        runat="server"/>
  
    </form>
  </body>
</html>

<%@ page language="VB" autoeventwireup="false" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
  
  Sub ItemDetailsView_ItemCommand(ByVal sender As Object, _
    ByVal e As DetailsViewCommandEventArgs) _
    Handles CustomerDetailsView.ItemCommand, _
    EmployeesDetailsView.ItemCommand
   
    ' Use the CommandName property to determine which button
    ' was clicked. 
    If e.CommandName = "Add" Then
      
      ' Because this event handler is used for two different
      ' DetailsView controls, use the CommandSource property 
      ' to get the DetailsView control that raised the event.
      Dim view As DetailsView = CType(e.CommandSource, DetailsView)
      
      ' Determine which ListBox control to update based on the
      ' ID of the DetailsView control that raised the event.
      Dim list As ListBox
      If view.ID = "CustomerDetailsView" Then

        list = CustomerListBox
      
      Else
      
        list = EmployeesListBox
      
      End If

      ' Add the selected item to the appropriate ListBox control. 

      ' Get the row that contains the value to add. For this
      ' example, get the second row (index 1) of the DetailsView 
      ' control.
      Dim row As DetailsViewRow = view.Rows(1)

      ' Get the value from the appropriate cell. For this
      ' example, get the value of the second cell (index 1) 
      ' of the row.
      Dim value As String = row.Cells(1).Text

      ' Create a ListItem object using the value.
      Dim item As New ListItem(value)

      ' Add the ListItem object to the ListBox control, if the 
      ' item does not already exist.
      If Not list.Items.Contains(item) Then
      
        list.Items.Add(item)
        
      End If

    End If

  End Sub
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>DetailsViewCommandEventArgs CommandSource Example</title>
</head>
<body>
    <form id="form1" runat="server">
    
      <h3>DetailsViewCommandEventArgs CommandSource Example</h3>
  
      <table border="0">
        <tr valign="top">
          <td>
            <asp:detailsview id="CustomerDetailsView"
              datasourceid="CustomerSource"
              allowpaging="true"
              autogeneraterows="true" 
              onitemcommand="ItemDetailsView_ItemCommand"  
              runat="server">
              <fields>
                <asp:buttonfield buttontype="Link"
                  causesvalidation="false"
                  text="Add to List"
                  commandname="Add"/>
              </fields>
            </asp:detailsview>
          </td>
          <td>
            <asp:detailsview id="EmployeesDetailsView"
              datasourceid="EmployeesSource"
              allowpaging="true"
              autogeneraterows="true" 
              onitemcommand="ItemDetailsView_ItemCommand"  
              runat="server">
              <fields>
                <asp:buttonfield buttontype="Link"
                  causesvalidation="false"
                  text="Add to List"
                  commandname="Add"/>
              </fields>
            </asp:detailsview>
          </td>
        </tr>
        <tr>
          <td>
            Selected Customers:<br/>
            <asp:listbox id="CustomerListBox"
              runat="server"/>
          </td>
          <td>
            Selected Employees:<br/>
            <asp:listbox id="EmployeesListBox"
              runat="server"/>
          </td>
        </tr>
      </table>
      
      <!-- 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="CustomerSource"
        selectcommand="Select [CustomerID], [CompanyName], [Address], 
          [City], [PostalCode], [Country] From [Customers]"
        connectionstring=
            "<%$ ConnectionStrings:NorthWindConnectionString%>" 
        runat="server"/>  
        
      <asp:sqldatasource id="EmployeesSource"
        selectcommand="Select [EmployeeID], [FirstName], [LastName], 
          [Title] From [Employees]"
        connectionstring=
            "<%$ ConnectionStrings:NorthWindConnectionString%>" 
        runat="server"/>
  
    </form>
  </body>
</html>

Keterangan

CommandSource Gunakan properti untuk mengakses properti objek yang mewakili sumber perintah. Dalam beberapa kasus, ini akan menjadi kontrol itu DetailsView sendiri, dan dalam kasus lain itu akan menjadi Button kontrol yang diklik.

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