WebPermission.IsSubsetOf(IPermission) Method

Definition

Namespace:

System.Net

Assembly:

System.Security.Permissions.dll

Package:

System.Security.Permissions v9.0.0-rc.2.24473.5

Source:

WebPermission.cs

Determines whether the current WebPermission is a subset of the specified object.

public:
 override bool IsSubsetOf(System::Security::IPermission ^ target);

public override bool IsSubsetOf (System.Security.IPermission target);

override this.IsSubsetOf : System.Security.IPermission -> bool

Public Overrides Function IsSubsetOf (target As IPermission) As Boolean

Parameters

target

IPermission

The WebPermission to compare to the current WebPermission.

Returns

Boolean

true if the current instance is a subset of the target parameter; otherwise, false. If the target is null, the method returns true for an empty current permission that is not unrestricted and false otherwise.

Exceptions

ArgumentException

The target parameter is not an instance of WebPermission.

NotSupportedException

The current instance contains a Regex-encoded right and there is not exactly the same right found in the target instance.

Examples

The following example uses IsSubsetOf to determine whether the access rights found in one instance of WebPermission are found in another instance of WebPermission.

// Create the target permission.
WebPermission^ targetPermission = gcnew WebPermission;
targetPermission->AddPermission( NetworkAccess::Connect, gcnew Regex( "www\\.contoso\\.com/Public/.*" ) );

// Create the permission for a URI matching target.
WebPermission^ connectPermission = gcnew WebPermission;
connectPermission->AddPermission( NetworkAccess::Connect, "www.contoso.com/Public/default.htm" );

//The following statement prints true.
Console::WriteLine( "Is the second URI a subset of the first one?: {0}", connectPermission->IsSubsetOf( targetPermission ) );

// Create the target permission.
WebPermission targetPermission = new WebPermission();
targetPermission.AddPermission(NetworkAccess.Connect, new Regex("www\\.contoso\\.com/Public/.*"));

// Create the permission for a URI matching target.
WebPermission connectPermission = new WebPermission();
connectPermission.AddPermission(NetworkAccess.Connect, "www.contoso.com/Public/default.htm");

//The following statement prints true.
Console.WriteLine("Is the second URI a subset of the first one?: " + connectPermission.IsSubsetOf(targetPermission));

   ' Create the target permission.
   Dim targetPermission As New WebPermission()
   targetPermission.AddPermission(NetworkAccess.Connect, New Regex("www\.contoso\.com/Public/.*"))
   
   ' Create the permission for a URI matching target.
   Dim connectPermission As New WebPermission()
   connectPermission.AddPermission(NetworkAccess.Connect, "www.contoso.com/Public/default.htm")
   
   'The following statement prints true.
   Console.WriteLine(("Is the second URI a subset of the first one?: " & connectPermission.IsSubsetOf(targetPermission)))
End Sub

Remarks

If the current WebPermission specifies a set of associated resources that is wholly contained by the target parameter, then the current WebPermission is a subset of target. This method overrides IsSubsetOf and is implemented to support the IPermission interface.