Note: This API is now obsolete.
Prevents callers higher in the call stack from using the code that calls this method to access the resource specified by the current instance.
Assembly: mscorlib (in mscorlib.dll)
The method should be used only to protect resources from accidental access by fully trusted code. It should not be used to protect resources from intentional misuse by untrusted code. For example, if method A issues a for a permission and then calls method B, method B can overtly override the by issuing an Assert. The called method is always higher in the stack. Therefore, if method B tries to access a protected resource, the security system begins checking for permissions with it because method B is the immediate caller, and then walks down the stack to confirm that there is no or PermitOnly lower in the stack. Method B, which is trying to access the resource, can stop the stack walk immediately by using the Assert method. In that case, the placed on the stack by method A (the calling method) is never discovered.
This method prevents callers higher in the call stack from accessing the protected resource through the code that calls this method, even if those callers have been granted permission to access it. The call stack is typically represented as growing down, so that methods higher in the call stack call methods lower in the call stack.
can limit the liability of the programmer or help prevent accidental security issues because it helps prevent the method that calls from being used to access the resource protected by the denied permission. If a method calls on a permission, and if a Demand for that permission is invoked by a caller lower in the call stack, that security check will fail when it reaches the .
The call to is effective until the calling code returns to its caller. Only one can be active on a frame. An attempt to call when an active exists on the frame results in a SecurityException. Call RevertDeny or RevertAll to remove an active . is ignored for a permission not granted because a demand for that permission will not succeed.Notes to Inheritors
You cannot override this method.
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.