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UrlIdentityPermission.UrlIdentityPermission(String) Constructor

Initializes a new instance of the UrlIdentityPermission class to represent the URL identity described by site.

Namespace: System.Security.Permissions
Assembly: mscorlib (in mscorlib.dll)

public UrlIdentityPermission (
	string site
public UrlIdentityPermission (
	String site
public function UrlIdentityPermission (
	site : String
Not applicable.



A URL or wildcard expression.

Exception typeCondition


The site parameter is a null reference (Nothing in Visual Basic).


The length of the site parameter is zero.


The URL, directory, or site portion of the site parameter is not valid.

The complete URL is considered, including the protocol (HTTP, HTTPS, FTP) and the file, for example:

URLs can be matched exactly or by a wildcard in the final position, for example:*. URLs can also contain a wildcard ("*") prefix at the dot delimiter. For example, the URL name string is a subset of http://* and http://*.com/process/grind.htm/.


New in version 2.0, for performance reasons, an invalid URL does not cause an argument exception at the time the new class instance is created. The argument exception will occur when one of the set operations (Union, Intersect, or IsSubsetOf) is executed. A demand on the permission causes IsSubsetOf to be called by the security infrastructure. The demand will fail because of the argument exception, resulting in a SecurityException being thrown. In this case the original ArgumentException exception will not be seen.

The following code example shows the use of the System.Security.Permissions.UrlIdentityPermission(String) constructor. This example is part of a larger example provided for the UrlIdentityPermission class.

UrlIdentityPermission permIdPerm1 = new UrlIdentityPermission("");

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

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0