DataListItem.ItemIndex Property
Gets the index of the DataListItem object from the Items collection of the control.
Assembly: System.Web (in System.Web.dll)
Use the ItemIndex property to determine the index number of the DataListItem object from the Items collection.
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This property only applies to data items in the DataList control. The ItemType property of the DataListItem object must be set to ListItemType.Item, ListItemType.AlternatingItem, ListItemType.SelectedItem, or ListItemType.EditItem. |
The following example demonstrates how to use the ItemIndex property to display the index number of the DataListItem object from the Items collection of the control.
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The following code sample uses the single-file code model and may not work correctly if copied directly into a code-behind file. This code sample must be copied into an empty text file that has an .aspx extension. For more information on the Web Forms code model, seeASP.NET Web Forms Page Code Model. |
<%@ 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" > <script language = "VB" runat="server"> Function CreateDataSource() As ICollection Dim dt As New DataTable() Dim dr As DataRow dt.Columns.Add(New DataColumn("StringValue", GetType(String))) Dim i As Integer For i = 0 To 9 dr = dt.NewRow() dr(0) = "Item " & i.ToString() dt.Rows.Add(dr) Next i Dim dv As New DataView(dt) Return dv End Function 'CreateDataSource Sub Page_Load(sender As Object, e As EventArgs) If Not IsPostBack Then DataList1.DataSource = CreateDataSource() DataList1.DataBind() End If End Sub 'Page_Load Sub Button_Click(sender As Object, e As EventArgs) Label1.Text = "The ItemIndex of each item in the DataList are: <br />" Dim item As DataListItem For Each item In DataList1.Items Label1.Text &= "<br />" & item.ItemIndex.ToString() & " - " & CType(item.Controls(1), DataBoundLiteralControl).Text Next item End Sub 'Button_Click </script> <head runat="server"> <title>DataListItem ItemIndex Example</title> </head> <body> <form id="form1" runat="server"> <h3>DataListItem ItemIndex Example</h3> <asp:DataList id="DataList1" runat="server" BorderColor="black" CellPadding="3" Font-Names="Verdana" Font-Size="8pt"> <HeaderStyle BackColor="#aaaadd"> </HeaderStyle> <AlternatingItemStyle BackColor="Gainsboro"> </AlternatingItemStyle> <HeaderTemplate> Items </HeaderTemplate> <ItemTemplate> <%# DataBinder.Eval(Container.DataItem, "StringValue") %> </ItemTemplate> </asp:DataList> <br /><br /> <asp:Button id="Button1" Text="Display ItemIndex for Items in the DataList" OnClick="Button_Click" runat="server"/> <br /><br /> <asp:Label id="Label1" runat="server"/> </form> </body> </html>
Available since 1.1
