System.Security.Permissions.PrincipalPermission.IsSubsetOf C# (CSharp) Method

        public bool IsSubsetOf(IPermission target)
        {
            if (target == null)
            {
                return IsEmpty();
            }
            else if (!VerifyType(target))
            {
                throw new ArgumentException(SR.Argument_WrongType, GetType().FullName);
            }

            PrincipalPermission operand = (PrincipalPermission)target;

            if (operand.IsUnrestricted())
            {
                return true;
            }
            else if (IsUnrestricted())
            {
                return false;
            }

            foreach (IDRole idRole in _idArray)
            {
                bool foundMatch = false;
                foreach (IDRole operandIdRole in operand._idArray)
                {
                    if ((operandIdRole.Authenticated == idRole.Authenticated) &&
                        (operandIdRole.ID == null || (idRole.ID != null && idRole.ID.Equals(operandIdRole.ID))) &&
                        (operandIdRole.Role == null || (idRole.Role != null && idRole.Role.Equals(operandIdRole.Role))))
                    {
                        foundMatch = true;
                        break;
                    }
                }

                if (!foundMatch)
                    return false;
            }

            return true;
        }

		public void IsSubsetOfBadPermission () 
		{
			PrincipalPermission p1 = new PrincipalPermission ("user", null);
			EnvironmentPermission ep2 = new EnvironmentPermission (PermissionState.Unrestricted);
			Assert ("IsSubsetOf(EnvironmentPermission)", p1.IsSubsetOf (ep2));
		}