System.Security.AccessControl.EventWaitHandleAccessRule Class

Represents a set of access rights allowed or denied for a user or group. This class cannot be inherited.

See Also: EventWaitHandleAccessRule Members


public sealed class EventWaitHandleAccessRule : AccessRule


The System.Security.AccessControl.EventWaitHandleAccessRule class is one of a set of classes that the .NET Framework provides for managing Windows access control security on named system events. For an overview of these classes, and their relationship to the underlying Windows access control structures, see System.Security.AccessControl.EventWaitHandleSecurity.


Windows access control security is meaningful only for named system events. If an System.Threading.EventWaitHandle object represents a local event, access control is irrelevant.

To get a list of the rules currently applied to a named event, use the System.Threading.EventWaitHandle.GetAccessControl method to get an System.Security.AccessControl.EventWaitHandleSecurity object, and then use its CommonObjectSecurity.GetAccessRules(bool, bool, Type) method to obtain a collection of System.Security.AccessControl.EventWaitHandleAccessRule objects.

System.Security.AccessControl.EventWaitHandleAccessRule objects do not map one-to-one with access control entries in the underlying discretionary access control list (DACL). When you get the set of all access rules for an event, the set contains the minimum number of rules currently required to express all the access control entries.


The underlying access control entries change as you apply and remove rules. The information in rules is merged if possible, to maintain the smallest number of access control entries. Thus, when you get the current list of rules, it might not look exactly like the list of all the rules you have added.

Use System.Security.AccessControl.EventWaitHandleAccessRule objects to specify the access rights to allow or deny to a user or group. An System.Security.AccessControl.EventWaitHandleAccessRule object always represents either allowed access or denied access, never both.

To apply a rule to a named system event, use the System.Threading.EventWaitHandle.GetAccessControl method to get the System.Security.AccessControl.EventWaitHandleSecurity object. Modify the System.Security.AccessControl.EventWaitHandleSecurity object by using its methods to add the rule, and then use the System.Threading.EventWaitHandle.SetAccessControl(EventWaitHandleSecurity) method to reattach the security object.


Changes you make to an System.Security.AccessControl.EventWaitHandleSecurity object do not affect the access levels of the named event until you call the System.Threading.EventWaitHandle.SetAccessControl(EventWaitHandleSecurity) method to assign the altered security object to the named event.

System.Security.AccessControl.EventWaitHandleAccessRule objects are immutable. Security for an event is modified using the methods of the System.Security.AccessControl.EventWaitHandleSecurity class to add or remove rules; as you do this, the underlying access control entries are modified.


Security on synchronization objects is not supported for Windows 98 or Windows Millennium Edition.


Namespace: System.Security.AccessControl
Assembly: mscorlib (in mscorlib.dll)
Assembly Versions:,
Since: .NET 2.0