DataListItem Class
Represents an item in a DataList control.
For a list of all members of this type, see DataListItem Members.
System.Object
System.Web.UI.Control
System.Web.UI.WebControls.WebControl
System.Web.UI.WebControls.DataListItem
[Visual Basic] Public Class DataListItem Inherits WebControl Implements INamingContainer [C#] public class DataListItem : WebControl, INamingContainer [C++] public __gc class DataListItem : public WebControl, INamingContainer [JScript] public class DataListItem extends WebControl implements INamingContainer
Thread Safety
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
Remarks
A DataListItem represents an item in a DataList control, such as a heading section, a footer section, or a data item.
The data items in the DataList control are stored in a DataListItemCollection that can be accessed by using the Items property of the DataList control.
You can use a DataListItem to programmatically access the properties of an item in a DataList control.
Example
[Visual Basic, C#] The following example demonstrates how to use a DataListItem to display the contents of each data item in the DataList control.
[Visual Basic, C#] Note 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, see Web Forms Code Model.
[Visual Basic] <%@ Page Language="VB" AutoEventWireup="True" %> <%@ Import Namespace="System.Data" %> <html> <script runat="server"> Function CreateDataSource() As ICollection ' Create sample data for the DataList control. Dim dt As DataTable = New DataTable() Dim dr As DataRow ' Define the columns of the table. dt.Columns.Add(New DataColumn("IntegerValue", GetType(Int32))) dt.Columns.Add(New DataColumn("StringValue", GetType(String))) dt.Columns.Add(New DataColumn("CurrencyValue", GetType(Double))) ' Populate the table with sample values. Dim i As Integer For i = 0 To 8 dr = dt.NewRow() dr(0) = i dr(1) = "Description for item " & i.ToString() dr(2) = 1.23 * (i + 1) dt.Rows.Add(dr) Next i Dim dv As DataView = New DataView(dt) Return dv End Function Sub Page_Load(sender As Object, e As EventArgs) ' Load sample data only once, when the page is first loaded. If Not IsPostBack Then ItemsList.DataSource = CreateDataSource() ItemsList.DataBind() End If End Sub Sub Item_Created(sender As Object, e As DataListItemEventArgs) If e.Item.ItemType = ListItemType.Item Or _ e.Item.ItemType = ListItemType.AlternatingItem Then ' Retrieve the Label control in the current DataListItem. Dim PriceLabel As Label = _ CType(e.Item.FindControl("PriceLabel"), Label) ' Retrieve the text of the CurrencyColumn from the DataListItem ' and convert the value to a Double. Dim Price As Double = Convert.ToDouble( _ (CType(e.Item.DataItem, DataRowView)).Row.ItemArray(2).ToString()) ' Format the value as currency and redisplay it in the DataList. PriceLabel.Text = Price.ToString("c") End If End Sub </script> <body> <form runat=server> <h3>DataList ItemCreated Example</h3> <asp:DataList id="ItemsList" BorderColor="black" CellPadding="5" CellSpacing="5" RepeatDirection="Vertical" RepeatLayout="Table" RepeatColumns="3" ShowBorder="True" OnItemCreated="Item_Created" runat="server"> <HeaderStyle BackColor="#aaaadd"> </HeaderStyle> <AlternatingItemStyle BackColor="Gainsboro"> </AlternatingItemStyle> <HeaderTemplate> List of items </HeaderTemplate> <ItemTemplate> Description: <br> <%# DataBinder.Eval(Container.DataItem, "StringValue") %> <br> Price: <asp:Label id="PriceLabel" runat="server"/> </ItemTemplate> </asp:DataList> </form> </body> </html> [C#] <%@ Page Language="C#" AutoEventWireup="True" %> <%@ Import Namespace="System.Data" %> <html> <script runat="server"> ICollection CreateDataSource() { // Create sample data for the DataList control. DataTable dt = new DataTable(); DataRow dr; // Define the columns of the table. dt.Columns.Add(new DataColumn("IntegerValue", typeof(Int32))); dt.Columns.Add(new DataColumn("StringValue", typeof(String))); dt.Columns.Add(new DataColumn("CurrencyValue", typeof(double))); // Populate the table with sample values. for (int i = 0; i < 9; i++) { dr = dt.NewRow(); dr[0] = i; dr[1] = "Description for item " + i.ToString(); dr[2] = 1.23 * (i + 1); dt.Rows.Add(dr); } DataView dv = new DataView(dt); return dv; } void Page_Load(Object sender, EventArgs e) { // Load sample data only once, when the page is first loaded. if (!IsPostBack) { ItemsList.DataSource = CreateDataSource(); ItemsList.DataBind(); } } void Item_Created(Object sender, DataListItemEventArgs e) { if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem) { // Retrieve the Label control in the current DataListItem. Label PriceLabel = (Label)e.Item.FindControl("PriceLabel"); // Retrieve the text of the CurrencyColumn from the DataListItem // and convert the value to a Double. Double Price = Convert.ToDouble( ((DataRowView)e.Item.DataItem).Row.ItemArray[2].ToString()); // Format the value as currency and redisplay it in the DataList. PriceLabel.Text = Price.ToString("c"); } } </script> <body> <form runat=server> <h3>DataList ItemCreated Example</h3> <asp:DataList id="ItemsList" BorderColor="black" CellPadding="5" CellSpacing="5" RepeatDirection="Vertical" RepeatLayout="Table" RepeatColumns="3" ShowBorder="True" OnItemCreated="Item_Created" runat="server"> <HeaderStyle BackColor="#aaaadd"> </HeaderStyle> <AlternatingItemStyle BackColor="Gainsboro"> </AlternatingItemStyle> <HeaderTemplate> List of items </HeaderTemplate> <ItemTemplate> Description: <br> <%# DataBinder.Eval(Container.DataItem, "StringValue") %> <br> Price: <asp:Label id="PriceLabel" runat="server"/> </ItemTemplate> </asp:DataList> </form> </body> </html>
[C++, JScript] No example is available for C++ or JScript. To view a Visual Basic or C# example, click the Language Filter button
in the upper-left corner of the page.
Requirements
Namespace: System.Web.UI.WebControls
Platforms: Windows 2000, Windows XP Professional, Windows Server 2003 family
Assembly: System.Web (in System.Web.dll)
See Also
DataListItem Members | System.Web.UI.WebControls Namespace | DataList | DataListItemCollection | Items