RangeValidator.AddAttributesToRender(HtmlTextWriter) Method
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Adds the HTML attributes and styles for the control that need to be rendered to the specified HtmlTextWriter object.
protected:
override void AddAttributesToRender(System::Web::UI::HtmlTextWriter ^ writer);
protected override void AddAttributesToRender (System.Web.UI.HtmlTextWriter writer);
override this.AddAttributesToRender : System.Web.UI.HtmlTextWriter -> unit
Protected Overrides Sub AddAttributesToRender (writer As HtmlTextWriter)
Parameters
- writer
- HtmlTextWriter
An HtmlTextWriter that represents the output stream to render HTML content on the client.
Examples
The following code example demonstrates how to override the AddAttributesToRender method in a custom server control so that the RangeValidator text always displays as bold.
Important
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.
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.CS.Controls" Assembly="Samples.AspNet.CS" %>
<%@ Page Language="C#" 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 RangeValidator - AddAttributesToRender - C# Example</title>
<script runat="server">
void ButtonClick(Object sender, EventArgs e)
{
if (Page.IsValid)
{
Label1.Text="Page is valid.";
}
else
{
Label1.Text="Page is not valid!!";
}
}
</script>
</head>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom RangeValidator - AddAttributesToRender - C# Example</h3>
Enter a number from 1 to 10:<br />
<asp:TextBox id="TextBox1" Runat="server" />
<aspSample:CustomRangeValidatorAddAttributesToRender
id="RangeValidator1"
runat="server"
ControlToValidate="TextBox1"
MinimumValue="1"
MaximumValue="10"
Type="Integer"
EnableClientScript="false"
Text="The value must be from 1 to 10!" />
<br />
<br />
<asp:Button id="Button1" Text="Submit" OnClick="ButtonClick" runat="server" /><br />
<br />
<asp:Label id="Label1" runat="server" />
</form>
</body>
</html>
<%@ 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 RangeValidator - AddAttributesToRender - VB.NET Example</title>
<script runat="server">
Sub ButtonClick(sender As Object, e As EventArgs)
If Page.IsValid Then
Label1.Text="Page is valid."
Else
Label1.Text="Page is not valid!"
End If
End Sub
</script>
</head>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom RangeValidator - AddAttributesToRender - VB.NET Example</h3>
Enter a number from 1 to 10:<br />
<asp:TextBox id="TextBox1" Runat="server" />
<aspSample:CustomRangeValidatorAddAttributesToRender id="RangeValidator1" runat="server"
ControlToValidate="TextBox1" MinimumValue="1" MaximumValue="10" Type="Integer"
EnableClientScript="false" Text="The value must be from 1 to 10!" /><br />
<br />
<asp:Button id="Button1" Text="Submit" OnClick="ButtonClick" runat="server" /><br />
<br />
<asp:Label id="Label1" runat="server"/>
</form>
</body>
</html>
using System.Web;
using System.Security.Permissions;
namespace Samples.AspNet.CS.Controls
{
[AspNetHostingPermission(SecurityAction.Demand, Level=AspNetHostingPermissionLevel.Minimal)]
public sealed class CustomRangeValidatorAddAttributesToRender : System.Web.UI.WebControls.RangeValidator
{
protected override void AddAttributesToRender(System.Web.UI.HtmlTextWriter writer)
{
// Show the Validation text as Bold
writer.AddStyleAttribute(System.Web.UI.HtmlTextWriterStyle.FontWeight, "bold");
// Call the base AddAttributesToRender method.
base.AddAttributesToRender(writer);
}
}
}
Imports System.Web
Imports System.Security.Permissions
Namespace Samples.AspNet.VB.Controls
<AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _
Public NotInheritable Class CustomRangeValidatorAddAttributesToRender
Inherits System.Web.UI.WebControls.RangeValidator
Protected Overrides Sub AddAttributesToRender(ByVal writer As System.Web.UI.HtmlTextWriter)
' Show the Validation text as Bold
writer.AddStyleAttribute(System.Web.UI.HtmlTextWriterStyle.FontWeight, "bold")
' Call the base AddAttributesToRender method.
MyBase.AddAttributesToRender(writer)
End Sub
End Class
End Namespace
Applies to
.NET
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