CustomValidator.AddAttributesToRender Method
.NET Framework 3.0
This method supports the .NET Framework infrastructure and is not intended to be used directly from your code.
Adds the properties of the CustomValidator control to the output stream for rendering on the client.
Namespace: System.Web.UI.WebControlsAssembly: System.Web (in system.web.dll)
protected void AddAttributesToRender ( HtmlTextWriter writer )
protected override function AddAttributesToRender ( writer : HtmlTextWriter )
Not applicable.
Parameters
- writer
A System.Web.UI.HtmlTextWriter that contains the output stream for rendering on the client.
The following code example demonstrates how to override the AddAttributesToRender method in a custom server control so that the CustomValidator error message always appears in bold.
Security Note: |
|---|
| This example has a text box that accepts user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview (Visual Studio). |
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet" Assembly="Samples.AspNet.JSL" %>
<%@ Page Language="VJ#" 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 CustomValidator - AddAttributesToRender - VJ# Example</title>
<script runat="server">
void CustomValidator1_ServerValidate(Object source,
ServerValidateEventArgs args)
{
try {
// Test whether the value entered into the text box is even.
int i = Int32.Parse(args.get_Value());
args.set_IsValid((i%2) == 0);
}
catch(Exception ex) {
args.set_IsValid(false);
}
} //CustomValidator1_ServerValidate
</script>
</head>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom CustomValidator - AddAttributesToRender - VJ# Example</h3>
<asp:Label id="Label1" runat="server"
Text="Enter an even number:" AssociatedControlID="TextBox1" /><br />
<asp:TextBox id="TextBox1" runat="server" />
<aspSample:CustomCustomValidatorAddAttributesToRender
id="Customvalidator1"
runat="server"
ControlToValidate="TextBox1"
Display="Static"
ErrorMessage="Not an even number!"
OnServerValidate="CustomValidator1_ServerValidate" /><br /><br />
<asp:Button id="Button1" runat="server" Text="Validate" />
</form>
</body>
</html>
...
package Samples.AspNet;
public class CustomCustomValidatorAddAttributesToRender
extends System.Web.UI.WebControls.CustomValidator
{
protected void AddAttributesToRender(System.Web.UI.HtmlTextWriter writer)
{
// Show the CompareValidator's error message as bold.
writer.AddStyleAttribute(System.Web.UI.HtmlTextWriterStyle.FontWeight,
"bold");
// Call the Base's AddAttributesToRender method.
super.AddAttributesToRender(writer);
} //AddAttributesToRender
} //CustomCustomValidatorAddAttributesToRender
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