PeerCollaborationPermission.IsSubsetOf(IPermission) Method
Definition
Important
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Determines whether the current PeerCollaborationPermission is a subset of the specified target permission.
public:
override bool IsSubsetOf(System::Security::IPermission ^ target);public override bool IsSubsetOf (System.Security.IPermission target);override this.IsSubsetOf : System.Security.IPermission -> boolPublic Overrides Function IsSubsetOf (target As IPermission) As BooleanParameters
- target
- IPermission
A permission that is to be tested for the subset relationship. This permission must be of the same type as the current permission.
Returns
true if the current PeerCollaborationPermission is a subset of the specified permission; otherwise, false.
Exceptions
The parameter is a null reference (Nothing in Visual Basic).
Remarks
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 IsSubsetOf 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) returnstrue.
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.
