The following example demonstrates how you can create a class that derives from the PageParserFilter class to govern the behavior of the ASP.NET page parser. The CustomPageParserFilter is a parser filter that explicitly rejects code in the page. It does this by overriding the AllowCode property.

Namespace Samples.AspNet.VB
    <PermissionSet(SecurityAction.Demand, Unrestricted := true)> _
    Public Class CustomPageParserFilter
        Inherits PageParserFilter

        Public Overrides ReadOnly Property AllowCode() As Boolean
            Get
                Return False
            End Get
        End Property

    End Class
End Namespace

namespace Samples.AspNet.CS
{
    [PermissionSet(SecurityAction.Demand, Unrestricted = true)]
    public class CustomPageParserFilter : PageParserFilter
    {
        public override bool AllowCode
        {
            get 
            {
                return false;
            }
        }
    }
}

To use the CustomPageParserFilter sample, place the class in your App_Code directory. You must configure the ASP.NET parsers to use the filter in the pages section of your site's Web.config configuration file. The following example configuration file shows the configuration for CustomPageParserFilter. When configured to use a parser filter, the ASP.NET parser throws an exception during the build if it encounters code in a page.

<?xml version="1.0" ?>

<configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0">

<system.web>

<pages

pageParserFilterType="Samples.AspNet.CS.CustomPageParserFilter">

</pages>

</system.web>

</configuration>

• AspNetHostingPermission 

  for operating in a hosted environment. Demand value: LinkDemand. Permission value: Minimal

• AspNetHostingPermission 

  for operating in a hosted environment. Demand value: InheritanceDemand. Permission value: Minimal

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

.NET Framework

Reference