HtmlImage.RenderAttributes Method
Assembly: System.Web (in system.web.dll)
protected void RenderAttributes ( HtmlTextWriter writer )
protected override function RenderAttributes ( writer : HtmlTextWriter )
Parameters
- writer
The HtmlTextWriter that contains the output stream to render on the client.
| Exception type | Condition |
|---|---|
| The Src property contains a malformed URL. |
If the value of the Src property is a malformed URL, the RenderAttributes method throws an HttpException exception.
The RenderAttributes method overrides the base class's RenderAttributes method to write the src attribute of the rendered HtmlImage control.
The RenderAttributes method is used primarily by control developers extending the functionality of the HtmlImage control.
The following code example demonstrates how to override the RenderAttributes method in a custom server control so that specific alternative text, accessible as a ToolTip, is always displayed with the HtmlImage control.
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.JSL.Controls" Assembly="Samples.AspNet.JSL" %>
<%@ Page Language="VJ#" AutoEventWireup="True" %>
<HTML>
<HEAD>
<title>Custom HtmlImage - RenderAttributes - VJ# Example</title>
</HEAD>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom HtmlImage - RenderAttributes - VJ# Example</h3>
<aspSample:CustomHtmlImageRenderAttributes id="Img1"
runat="server"
border="0"
src="http://www.microsoft.com/homepage/gif/bnr-microsoft.gif" />
</form>
</body>
</HTML>
package Samples.AspNet.JSL.Controls;
public class CustomHtmlImageRenderAttributes
extends System.Web.UI.HtmlControls.HtmlImage
{
protected void RenderAttributes(System.Web.UI.HtmlTextWriter writer)
{
// Call the base's RenderAttributes method.
super.RenderAttributes(writer);
// Write out Title tag
writer.Write(" alt=\"Text from custom RenderAttributes method.\"");
} //RenderAttributes
} //CustomHtmlImageRenderAttributes
Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.