Determines whether the current permission is a subset of the specified permission.
Syntax
Parameters
- target
Returns
true if the current permission is a subset of the specified permission; otherwise, false.
Exceptions
Type Reason ArgumentException target is not null and is not of the same type as the current instance.
Remarks
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 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 IPermission.IsSubsetOf(IPermission) method. X, Y, and Z represent System.Security.IPermission objects that are not null.
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 System.Security.IPermission object with a permission state of System.Security.Permissions.PermissionState.None and Y represents an System.Security.IPermission object that is null, 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.
Requirements
Assembly: mscorlib (in mscorlib.dll)
Assembly Versions: 1.0.5000.0, 2.0.0.0, 4.0.0.0