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WebPermissionAttribute.AcceptPattern Property

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

[Visual Basic]
Public Property AcceptPattern As String
public string AcceptPattern {get; set;}
public: __property String* get_AcceptPattern();
public: __property void set_AcceptPattern(String*);
public function get AcceptPattern() : String;
public function set AcceptPattern(String);

Property Value

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.


Exception Type Condition
ArgumentException AcceptPattern is not a null reference (Nothing in Visual Basic) 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.


[Visual Basic, C#, C++] The following example demonstrates how to use WebPermissionAttribute to specify an allowable AcceptPattern.

[Visual Basic] 
<WebPermission(SecurityAction.Deny, AcceptPattern := "http://www\.contoso\.com/Private/.*")> _
  Public Shared Sub       CheckAcceptPermission(uriToCheck As String)
     Dim re As New Regex("http://www\.contoso\.com/Public/.*")
     Dim con As New WebPermission(NetworkAccess.Connect, re)
     Dim permissionToCheck As New WebPermission()
     permissionToCheck.AddPermission(NetworkAccess.Accept, uriToCheck)
  End Sub 'CheckAcceptPermission
  Public Shared Sub demoDenySite()
     'Passes a security check.
     Console.WriteLine("Public page has passed Accept permission check")
        'Throws a SecurityException.
        Console.WriteLine("This line will not be printed")
     Catch e As SecurityException
        Console.WriteLine(("Expected exception" + e.Message))
     End Try
  End Sub 'demoDenySite

[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);

[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button Language Filter in the upper-left corner of the page.


Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

See Also

WebPermissionAttribute Class | WebPermissionAttribute Members | System.Net Namespace | Regular Expression Language Elements