ImageButton.AddAttributesToRender Method (HtmlTextWriter)
Adds the attributes of an ImageButton to the output stream for rendering on the client.
Assembly: System.Web (in System.Web.dll)
Parameters
- writer
-
Type:
System.Web.UI.HtmlTextWriter
The output stream to render on the client.
The OnPreRender method is used primarily by control developers when deriving a custom class from the ImageButton control.
The following code example demonstrates how to override the AddAttributesToRender method in a custom server control so that the ImageButton text always appears with a thin border.
Note |
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The following code sample uses the single-file code model and may not work correctly if copied directly into a code-behind file. The first part of this code sample must be copied into an empty text file that has an .aspx extension. The second part must be saved as a code file (either .cs for C# or .vb for Visual Basic). For more information on the Web Forms code model, see ASP.NET Web Forms Page Code Model. |
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.VB.Controls" Assembly="Samples.AspNet.VB" %> <%@ Page Language="VB" AutoEventWireup="True" %> <!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 ImageButton - AddAttributesToRender - VB.NET Example</title> <script runat="server"> Sub ImageButton1_Command(sender As Object, e As CommandEventArgs) ' Redirect to the Microsoft home page. Response.Redirect("http://www.microsoft.com/") End Sub </script> </head> <body> <form id="Form1" method="post" runat="server"> <h3>Custom ImageButton - AddAttributesToRender - VB.NET Example</h3> <aspSample:CustomImageButtonAddAttributesToRender id="ImageButton1" runat="server" OnCommand="ImageButton1_Command" AlternateText="Microsoft Home" ImageUrl="http://www.microsoft.com/homepage/gif/bnr-microsoft.gif" /> </form> </body> </html>
<AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _ Public NotInheritable Class CustomImageButtonAddAttributesToRender Inherits System.Web.UI.WebControls.ImageButton Protected Overrides Sub AddAttributesToRender(ByVal writer As System.Web.UI.HtmlTextWriter) ' Show the ImageButton with a thin border. writer.AddStyleAttribute("border-width", "thin") ' Call the Base's AddAttributesToRender method. MyBase.AddAttributesToRender(writer) End Sub End Class
Available since 1.1
