Determines whether the current PeerCollaborationPermission is a subset of the specified target permission.
Assembly: System.Net (in System.Net.dll)
- Type: System.Security.IPermission
A permission that is to be tested for the subset relationship. This permission must be of the same type as the current permission.
Return ValueType: System.Boolean
True if the current PeerCollaborationPermission is a subset of the specified permission; otherwise, false.
The parameter is a null reference (Nothing in Visual Basic).
The current PeerCollaborationPermission 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 "C:\example.txt" is a subset of a permission that represents access to "C:\". If this method returns true, the current permission represents no more access to the protected resource than does the specified permission.
The following statements are required to be true for all implementations of the method. X, Y, and Z represent IPermission objects that are not a null reference (Nothing in Visual Basic).
X.IsSubsetOf(X) returns true.
X.IsSubsetOf(Y) returns the same value as Y.IsSubsetOf(X) if and only if X and Y represent the same set of permissions.
If X.IsSubsetOf(Y) and Y.IsSubsetOf(Z) both return true, X.IsSubsetOf(Z) returns true.
If X represents an empty IPermission object with a permission state of None and Y represents an IPermission object that is a null reference (Nothing in Visual Basic), X.IsSubsetOf(Y) returns true. If Z is also an empty permission, the compound set operation X.Union(Z).IsSubsetOf(Y) also returns true because the Union of two empty permissions is an empty permission.
Windows 7, Windows Vista SP1 or later, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.