List.ItemCommand Event
Definition
Important
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Occurs when the user selects a command that is associated with a List control. This API is obsolete. For information about how to develop ASP.NET mobile applications, see Mobile Apps & Sites with ASP.NET.
public:
event System::Web::UI::MobileControls::ListCommandEventHandler ^ ItemCommand;public event System.Web.UI.MobileControls.ListCommandEventHandler ItemCommand;member this.ItemCommand : System.Web.UI.MobileControls.ListCommandEventHandler Public Custom Event ItemCommand As ListCommandEventHandler Event Type
Examples
The following code example shows how to use the ItemCommand event to call a method that changes the status of an item in the list and recalculates the status totals. This example is part of a larger example for the List overview.
private void Status_ItemCommand(object sender,
ListCommandEventArgs e)
{
const string spec = "You now have {0} " +
"tasks done, {1} tasks scheduled, and " +
"{2} tasks pending.";
// Move selection to next status toward 'done'
switch (e.ListItem.Value)
{
case "scheduled":
schedCount -= 1;
pendCount += 1;
e.ListItem.Value = "pending";
break;
case "pending":
pendCount -= 1;
doneCount += 1;
e.ListItem.Value = "done";
break;
}
// Show the status of the current task
Label1.Text = e.ListItem.Text + " is " +
e.ListItem.Value;
// Show current selection counts
Label2.Text = String.Format(spec, doneCount,
schedCount, pendCount);
}
Private Sub Status_ItemCommand(ByVal sender As Object, _
ByVal e As ListCommandEventArgs)
Const spec As String = "You now have {0} tasks done, {1} " & _
"tasks scheduled, and {2} tasks pending."
' Move selection to next status toward 'done'
Select Case e.ListItem.Value
Case "scheduled"
schedCount -= 1
pendCount += 1
e.ListItem.Value = "pending"
Case "pending"
pendCount -= 1
doneCount += 1
e.ListItem.Value = "done"
End Select
' Show the status of the current task
Label1.Text = e.ListItem.Text & " is " & _
e.ListItem.Value
' Show current selection counts
Label2.Text = String.Format(spec, doneCount, _
schedCount, pendCount)
End Sub
Remarks
When you render a list by using templates, the ItemCommand event handler is called through the event-bubbling mechanism of ASP.NET. The event handler is passed an argument of type ListCommandEventArgs, which contains information about the source item and the CommandName property of the control that generated the event. This allows you to render a single list item with multiple associated interactions.
On default rendering, the control provides a basic user interface (UI) that allows the user to click list items. On postback, the ItemCommand event handler is called with an argument of type ListCommandEventArgs, which contains information about the source item. The CommandName property of this object is null.
