DataListCommandEventArgs.CommandSource Proprietà
Definizione
Importante
Alcune informazioni sono relative alla release non definitiva del prodotto, che potrebbe subire modifiche significative prima della release definitiva. Microsoft non riconosce alcuna garanzia, espressa o implicita, in merito alle informazioni qui fornite.
Ottiene l'origine del comando.
public:
property System::Object ^ CommandSource { System::Object ^ get(); };public object CommandSource { get; }member this.CommandSource : objPublic ReadOnly Property CommandSource As ObjectValore della proprietà
Origine del comando.
Esempio
Nell'esempio seguente viene illustrato come utilizzare la CommandSource proprietà per determinare il comando selezionato dall'utente. Esegue quindi l'azione appropriata in base al comando .
<%@ 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>
Commenti
Utilizzare la CommandSource proprietà per determinare l'origine del comando che ha generato l'evento. Questa proprietà viene comunemente usata per determinare quale comando genera l'evento. È quindi possibile eseguire un'azione appropriata, in base al comando .