WebPermissionAttribute.AcceptPattern Property

Definition

Namespace:

System.Net

Assembly:

System.Security.Permissions.dll

Source:

WebPermissionAttribute.cs

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

C#

public string AcceptPattern { get; set; }

Property Value

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 Regex constructor string.

Exceptions

ArgumentException

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.

Examples

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

C#

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

public static void CheckAcceptPermission(string uriToCheck) {

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

public static void demoDenySite() {
    //Passes a security check.
    CheckAcceptPermission("http://www.contoso.com/Public/page.htm");
    Console.WriteLine("Public page has passed Accept permission check");

    try {
        //Throws a SecurityException.
        CheckAcceptPermission("http://www.contoso.com/Private/page.htm");
        Console.WriteLine("This line will not be printed");
}
    catch (SecurityException e) {
        Console.WriteLine("Expected exception: " + e.Message);
    }
 }

Remarks

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.

Applies to

See also

• Regular Expression Language - Quick Reference