This documentation is archived and is not being maintained.

WebPermissionAttribute.AcceptPattern Property

Gets or sets a regular expression pattern that describes the URI accepted by the current WebPermissionAttribute.

Namespace:  System.Net
Assembly:  System (in System.dll)

public string AcceptPattern { get; set; }

Property Value

Type: System.String
A string containing a regular expression pattern that describes the URI accepted by the current WebPermissionAttribute. This string must be escaped according to the rules for encoding a System.Text.RegularExpressions.Regex constructor string.


AcceptPattern is not null when you attempt to set the value. If you wish to specify more than one Accept URI, use an additional attribute declaration statement.

When applying WebPermissionAttribute to your class, this property specifies what regular expression string will be accepted for use within your class. This property is write-once.

The following example demonstrates how to use WebPermissionAttribute to specify an allowable AcceptPattern.

[WebPermission(SecurityAction.Deny, AcceptPattern=@"http://www\.contoso\.com/Private/.*")]

public static void CheckAcceptPermission(string uriToCheck) {

    WebPermission permissionToCheck = new WebPermission();
    permissionToCheck.AddPermission(NetworkAccess.Accept, uriToCheck);

public static void demoDenySite() {
    //Passes a security check.
    Console.WriteLine("Public page has passed Accept permission check");

    try {
        //Throws a SecurityException.
        Console.WriteLine("This line will not be printed");
    catch (SecurityException e) {
        Console.WriteLine("Expected exception: " + e.Message);

   [method:WebPermission(SecurityAction::Deny, AcceptPattern=S"http://www\\.contoso\\.com/Private/.*")]
   static void CheckAcceptPermission(String* uriToCheck) {
      WebPermission* permissionToCheck = new WebPermission();
      permissionToCheck->AddPermission(NetworkAccess::Accept, uriToCheck);

   static void demoDenySite() {
      // Passes a security check.
      Console::WriteLine(S"Public page has passed Accept permission check");

      try {
         // Throws a SecurityException.
         Console::WriteLine(S"This line will not be printed");
      } catch (SecurityException* e) {
         Console::WriteLine(S"Expected exception: {0}", e->Message);

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

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0