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DataListCommandEventArgs.CommandSource Propriété

  • Référence

Définition

Espace de noms:
System.Web.UI.WebControls
Assembly:
System.Web.dll

Obtient la source de la commande.

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

Valeur de propriété

Object

Source de la commande.

Exemples

L’exemple suivant montre comment utiliser la CommandSource propriété pour déterminer la commande sélectionnée par l’utilisateur. Il effectue ensuite l’action appropriée en fonction de la commande.

<%@ Page Language="C#" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
 
<!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" >
<head>
    <title>DataListCommandEventArgs Example</title>
<script language="c#" runat="server">
 
      ICollection CreateDataSource() 
      {
         
         DataTable dt = new DataTable();
         DataRow dr;
 
         // Create a DataTable.
         dt.Columns.Add(new DataColumn("IntegerValue", typeof(Int32)));
         dt.Columns.Add(new DataColumn("StringValue", typeof(string)));
         dt.Columns.Add(new DataColumn("DateTimeValue", typeof(DateTime)));
 
         // Create sample data.
         for (int i = 1; i <= 9; i++) 
         {
            dr = dt.NewRow();
            dr[0] = i;
            dr[1] = "Item " + i.ToString();
            dr[2] = DateTime.Now.ToShortTimeString();
            dt.Rows.Add(dr);
         }
          
 
         // Return a DataView to the DataTable.
         DataView dv = new DataView(dt);
         return dv;
         
      }
 
      void Page_Load(Object sender, EventArgs e) 
      {
         
         if (!IsPostBack)
            BindList();
 
      }
 
      void BindList() 
      {

         DataList1.DataSource = CreateDataSource();
         DataList1.DataBind();

      }
     
      void DataList_ItemCommand(object sender, DataListCommandEventArgs e) 
      {          
         if (((LinkButton)e.CommandSource).CommandName == "select")
            DataList1.SelectedIndex = e.Item.ItemIndex;
         
         BindList();
      }
 
   </script>
 
</head>
<body>
 
   <form id="form1" runat="server">

      <h3>DataListCommandEventArgs Example</h3>
 
      <asp:DataList id="DataList1"                                                
                    GridLines="Both"                                                       
                    OnItemCommand="DataList_ItemCommand"
                    runat="server">

         <HeaderTemplate>
            Items
         </HeaderTemplate>

         <ItemTemplate>
            <asp:LinkButton id="button1"
                            Text="Show details" 
                            CommandName="select" 
                            runat="server"/>
            <%# DataBinder.Eval(Container.DataItem, "StringValue") %>
         </ItemTemplate>

         <SelectedItemTemplate>
            Item:
            <%# DataBinder.Eval(Container.DataItem, "StringValue") %>
            <br />
            Order Date:
            <%# DataBinder.Eval(Container.DataItem, "DateTimeValue", "{0:d}") %>
            <br />
            Quantity:
            <%# DataBinder.Eval(Container.DataItem, "IntegerValue", "{0:N1}") %>
            <br />
         </SelectedItemTemplate>
 
      </asp:DataList>

   </form>
 
</body>
</html>

<%@ Page Language="VB" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
 
<!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" >
<head>
    <title>DataListCommandEventArgs Example</title>
<script language="VB" runat="server">
 
    Function CreateDataSource() As ICollection
        
        Dim dt As New DataTable()
        Dim dr As DataRow
        
        ' Create a DataTable.
        dt.Columns.Add(New DataColumn("IntegerValue", GetType(Int32)))
        dt.Columns.Add(New DataColumn("StringValue", GetType(String)))
        dt.Columns.Add(New DataColumn("DateTimeValue", GetType(DateTime)))
        
        ' Create sample data.
        Dim i As Integer
        For i = 1 To 9
            dr = dt.NewRow()
            dr(0) = i
            dr(1) = "Item " & i.ToString()
            dr(2) = DateTime.Now.ToShortTimeString()
            dt.Rows.Add(dr)
        Next i
        
        
        ' Return a DataView to the DataTable.
        Dim dv As New DataView(dt)
        Return dv
    End Function 'CreateDataSource
     

    Sub Page_Load(sender As Object, e As EventArgs)
        
        If Not IsPostBack Then
            BindList()
        End If 
    End Sub 'Page_Load


    Sub BindList()
        
        DataList1.DataSource = CreateDataSource()
        DataList1.DataBind()
    End Sub 'BindList
     

    Sub DataList_ItemCommand(sender As Object, e As DataListCommandEventArgs)
        If CType(e.CommandSource, LinkButton).CommandName = "select" Then
            DataList1.SelectedIndex = e.Item.ItemIndex
        End If 
        BindList()
    End Sub 'DataList_ItemCommand
     
   </script>
 
</head>
<body>
 
   <form id="form1" runat="server">

      <h3>DataListCommandEventArgs Example</h3>
 
      <asp:DataList id="DataList1"                                                
                    GridLines="Both"                                                       
                    OnItemCommand="DataList_ItemCommand"
                    runat="server">

         <HeaderTemplate>
            Items
         </HeaderTemplate>

         <ItemTemplate>
            <asp:LinkButton id="button1"
                            Text="Show details" 
                            CommandName="select" 
                            runat="server"/>
            <%# DataBinder.Eval(Container.DataItem, "StringValue") %>
         </ItemTemplate>

         <SelectedItemTemplate>
            Item:
            <%# DataBinder.Eval(Container.DataItem, "StringValue") %>
            <br />
            Order Date:
            <%# DataBinder.Eval(Container.DataItem, "DateTimeValue", "{0:d}") %>
            <br />
            Quantity:
            <%# DataBinder.Eval(Container.DataItem, "IntegerValue", "{0:N1}") %>
            <br />
         </SelectedItemTemplate>
 
      </asp:DataList>

   </form>
 
</body>
</html>

Remarques

Utilisez la CommandSource propriété pour déterminer la source de commande qui a déclenché l’événement. Cette propriété est couramment utilisée pour déterminer quelle commande déclenche l’événement. Vous pouvez ensuite effectuer une action appropriée, en fonction de la commande.

S’applique à

Voir aussi