DetailsViewCommandEventArgs.CommandSource Propiedad

  • Referencia

Definición

Espacio de nombres:
System.Web.UI.WebControls
Ensamblado:
System.Web.dll

Obtiene el origen del comando.

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

Valor de propiedad

Object

Instancia de la clase Object que representa el origen del comando.

Ejemplos

En el ejemplo de código siguiente se muestra cómo usar la CommandSource propiedad para determinar cuál de los dos DetailsView controles generó el ItemCommand evento.

<%@ 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>

Comentarios

Utilice la CommandSource propiedad para tener acceso a las propiedades del objeto que representa el origen del comando. En algunos casos, será el DetailsView propio control y, en otros casos, será el control en el Button que se hizo clic.

Se aplica a

Consulte también