Control.ChildControlsCreated Property
.NET Framework (current version)
Gets a value that indicates whether the server control's child controls have been created.
Assembly: System.Web (in System.Web.dll)
The following example demonstrates an override of the OnDataBinding method of a custom Repeater control. To ensure that child controls are not created until data binding occurs again, the ChildControlsCreated property is set to true after the RepeaterItem objects are created and added to the control's ControlCollection object.
Imports System Imports System.Collections Imports System.Web Imports System.Web.UI Imports System.Web.UI.WebControls Namespace TemplateControlSamplesVB <ParseChildren(True)> _ Public Class CustomRepeaterVB : Inherits Repeater ' Override to prevent LiteralControls from being added as children. Protected Overrides Sub AddParsedSubObject(ByVal O As Object) End Sub ' Override to create repeated items. Protected Overrides Sub CreateChildControls() Dim O As Object = ViewState("NumItems") If Not (O Is Nothing) Then ' Clear any existing child controls. Controls.Clear() Dim i As Integer Dim NumItems As Integer = CInt(O) For i = 0 To NumItems - 1 ' Create an item. Dim Item As RepeaterItem = New RepeaterItem(i, ListItemType.Item) ' Initialize the item from the template. ItemTemplate.InstantiateIn(Item) ' Add the item to the ControlCollection. Controls.Add(Item) Next End If End Sub ' Override to create the repeated items from the DataSource. Protected Overrides Sub OnDataBinding(ByVal E As EventArgs) MyBase.OnDataBinding(E) If Not DataSource Is Nothing Then ' Iterate over the DataSource, creating a new item for each data item. Dim DataEnum As IEnumerator = DataSource.GetEnumerator() Dim i As Integer = 0 Do While (DataEnum.MoveNext()) ' Create an item. Dim Item As RepeaterItem = New RepeaterItem(i, ListItemType.Item) ' Initialize the item from the template. ItemTemplate.InstantiateIn(Item) ' Add the item to the ControlCollection. Controls.Add(Item) i = i + 1 Loop ' Prevent child controls from being created again. ChildControlsCreated = True ' Store the number of items created in view state for postback scenarios. ViewState("NumItems") = i End If End Sub End Class End Namespace
The following example demonstrates how to use the custom repeater control in a Web page.
<%@ Page Language="VB" %> <%@ Register TagPrefix="Samples" Namespace="TemplateControlSamplesVB" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server"> Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Dim a As New ArrayList() a.Add("data item 1") a.Add("data item 2") Repeater1.DataSource = a Page.DataBind() End Sub </script> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>ChildControlsCreated Example</title> </head> <body> <form id="form1" runat="server"> <div> <Samples:CustomRepeaterVB ID="Repeater1" runat="server"> <ItemTemplate><%# Container.DataItem %> <br /></ItemTemplate> </Samples:CustomRepeaterVB> </div> </form> </body> </html>
.NET Framework
Available since 1.1
Available since 1.1
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