CheckBoxList.Render Method (HtmlTextWriter)
.NET Framework (current version)
Displays the CheckBoxList on the client.
Assembly: System.Web (in System.Web.dll)
Parameters
- writer
-
Type:
System.Web.UI.HtmlTextWriter
A System.Web.UI.HtmlTextWriter that contains the output stream for rendering on the client.
The Render method is used primarily by control developers in custom controls that derive from the CheckBoxList class.
The Render implementation for a CheckBoxList control initializes a RepeatInfo object for the list, and calls the RenderRepeater method, which in turn uses the RenderItem method to render individual check box list items.
The following code example demonstrates how to override the Render method in a custom server control so that the CheckBoxList always displays an image.
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.CS.Controls" Assembly="Samples.AspNet.CS" %> <%@ Page language="c#" %> <!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" > <head> <title>Custom CheckBoxList - Render - C# Example</title> </head> <body> <form id="Form1" method="post" runat="server"> <h3>Custom CheckBoxList - Render - C# Example</h3> <aspSample:CustomCheckBoxListRender id="CheckBoxList1" runat="server"> <asp:ListItem Selected="True">Item 1</asp:ListItem> <asp:ListItem>Item 2</asp:ListItem> <asp:ListItem>Item 3</asp:ListItem> <asp:ListItem>Item 4</asp:ListItem> <asp:ListItem>Item 5</asp:ListItem> <asp:ListItem>Item 6</asp:ListItem> </aspSample:CustomCheckBoxListRender> </form> </body> </html>
using System.Web; using System.Security.Permissions; namespace Samples.AspNet.CS.Controls { [AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)] public sealed class CustomCheckBoxListRender : System.Web.UI.WebControls.CheckBoxList { protected override void Render(System.Web.UI.HtmlTextWriter writer) { // Create and render a new Image Web control. System.Web.UI.WebControls.Image image = new System.Web.UI.WebControls.Image(); image.ID = "Image1"; image.ImageUrl = "image.jpg"; image.AlternateText = "Image for CheckBoxList1."; image.RenderControl(writer); // Call the base class's Render method. base.Render(writer); } } }
.NET Framework
Available since 1.1
Available since 1.1
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