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WebPermission.IsSubsetOf Method

.NET Framework 1.1

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

[Visual Basic]
Overrides Public Function IsSubsetOf( _
   ByVal target As IPermission _
) As Boolean Implements IPermission.IsSubsetOf
[C#]
public override bool IsSubsetOf(
 IPermission target
);
[C++]
public: bool IsSubsetOf(
 IPermission* target
);
[JScript]
public override function IsSubsetOf(
   target : IPermission
) : Boolean;

Parameters

target: The WebPermission to compare to the current WebPermission.

Return Value

true if the current instance is a subset of the target parameter; otherwise, false. If the target is a null reference (Nothing in Visual Basic), the method returns true for an empty current permission that is not unrestricted and false otherwise.

Implements

IPermission.IsSubsetOf

Exceptions

Exception Type	Condition
ArgumentException	the target parameter is not an instance of WebPermission.
NotSupportedException	If the current instance contains a Regex-encoded right and there is not exactly same right found in the target instance.

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.

Example

[Visual Basic, C#, C++] The following example uses IsSubsetOf to determine if the access rights found in one instance of WebPermission are found in another instance of WebPermission.

[Visual Basic] 
' 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 'myIsSubsetExample


[C#] 

    // 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));


[C++] 
// Create the target permission.
WebPermission* targetPermission = new WebPermission();
targetPermission->AddPermission(NetworkAccess::Connect, new Regex(S"www\\.contoso\\.com/Public/.*"));

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

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

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

Requirements

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, Common Language Infrastructure (CLI) Standard