DataListItemEventArgs Class
Assembly: System.Web (in system.web.dll)
The ItemCreated event is raised when an item in the DataList control is created.
The ItemDataBound event is raised when an item in the DataList control is data bound to a source.
For a list of initial property values for an instance of DataListItemEventArgs, see the DataListItemEventArgs constructor.
For more information about handling events, see Consuming Events.
The following example demonstrates how to define a handler for the ItemDataBound event. The code in the handler calculates the price of items in a DataList control. This example specifies the event handler declaratively, setting the event handler for the OnItemDataBound attribute of the DataList control.
<%@ 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 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_Bound(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> <head runat="server"> <title>DataList ItemDataBound Example</title> </head> <body> <form id="form1" runat="server"> <h3>DataList ItemDataBound Example</h3> <asp:DataList id="ItemsList" BorderColor="black" CellPadding="5" CellSpacing="5" RepeatDirection="Vertical" RepeatLayout="Table" RepeatColumns="3" OnItemDataBound="Item_Bound" 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>
The following example demonstrates how to specify the event handler and programmatically add it to the ItemDataBound event in the Page_Load method.
<%@ 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 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) ' Manually register the event-handling method for the ' ItemCommand event. AddHandler ItemsList.ItemDataBound, AddressOf Item_Bound ' 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_Bound(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> <head runat="server"> <title>DataList ItemDataBound Example</title> </head> <body> <form id="form1" runat="server"> <h3>DataList ItemDataBound Example</h3> <asp:DataList id="ItemsList" BorderColor="black" CellPadding="5" CellSpacing="5" RepeatDirection="Vertical" RepeatLayout="Table" RepeatColumns="3" OnItemDataBound="Item_Bound" 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>
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