SocketPermission.IsSubsetOf Method

Determines if the current permission is a subset of the specified permission.

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

public override bool IsSubsetOf(
	IPermission target
)

Parameters

target
Type: System.Security.IPermission
A SocketPermission that is to be tested for the subset relationship.

Return Value

Type: System.Boolean
If target is null, this method returns true if the current instance defines no permissions; otherwise, false. If target is not null, this method returns true if the current instance defines a subset of target permissions; otherwise, false.

Implements

IPermission.IsSubsetOf(IPermission)

ExceptionCondition
ArgumentException

target is not a SocketException.

SecurityException

DnsPermission is not granted to the method caller.

The current permission is a subset of the specified permission if the current permission specifies a set of operations that is wholly contained by the specified permission.

For example, a permission that represents access to 192.168.1.1:80 is a subset of a permission that represents access to 192.168.1.1:Any. If this method returns true, the current permission represents no more access to the protected resource than does the specified permission.

The following example uses the IsSubsetOf method to determine if one SocketPermission is the subset of another.



     // Creates a SocketPermission restricting access to and from all URIs.
     SocketPermission mySocketPermission1 = new SocketPermission(PermissionState.None);

     // The socket to which this permission will apply will allow connections from www.contoso.com.
     mySocketPermission1.AddPermission(NetworkAccess.Accept, TransportType.Tcp, "www.contoso.com", 11000);

     // Creates a SocketPermission which will allow the target Socket to connect with www.southridgevideo.com.
     SocketPermission mySocketPermission2 =
                                new SocketPermission(NetworkAccess.Connect, TransportType.Tcp, "www.southridgevideo.com", 11002);

     // Creates a SocketPermission from the union of two SocketPermissions.
     SocketPermission mySocketPermissionUnion = 
                                (SocketPermission)mySocketPermission1.Union(mySocketPermission2);

     // Checks to see if the union was successfully created by using the IsSubsetOf method.
     if (mySocketPermission1.IsSubsetOf(mySocketPermissionUnion) && 
     	   mySocketPermission2.IsSubsetOf(mySocketPermissionUnion)){
          Console.WriteLine("This union contains permissions from both mySocketPermission1 and mySocketPermission2"); 

          // Prints the allowable accept URIs to the console.
          Console.WriteLine("This union accepts connections on :");

          IEnumerator myEnumerator = mySocketPermissionUnion.AcceptList;
	   while (myEnumerator.MoveNext()) {
               Console.WriteLine(((EndpointPermission)myEnumerator.Current).ToString());
	        }      

             // Prints the allowable connect URIs to the console.
          Console.WriteLine("This union permits connections to :");

          myEnumerator = mySocketPermissionUnion.ConnectList;
	   while (myEnumerator.MoveNext()) {
               Console.WriteLine(((EndpointPermission)myEnumerator.Current).ToString());
	        }      

           }



.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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