Represents a set of access rights allowed or denied for a user or group. This class cannot be inherited.
Assembly: System (in System.dll)
Thetype exposes the following members.
|SemaphoreAccessRule(IdentityReference, SemaphoreRights, AccessControlType)||Initializes a new instance of the class, specifying the user or group the rule applies to, the access rights, and whether the specified access rights are allowed or denied.|
|SemaphoreAccessRule(String, SemaphoreRights, AccessControlType)||Initializes a new instance of the class, specifying the name of the user or group the rule applies to, the access rights, and whether the specified access rights are allowed or denied.|
|AccessControlType||Gets the AccessControlType value associated with this AccessRule object. (Inherited from AccessRule.)|
|AccessMask||Gets the access mask for this rule. (Inherited from AuthorizationRule.)|
|IdentityReference||Gets the IdentityReference to which this rule applies. (Inherited from AuthorizationRule.)|
|InheritanceFlags||Gets the value of flags that determine how this rule is inherited by child objects. (Inherited from AuthorizationRule.)|
|IsInherited||Gets a value indicating whether this rule is explicitly set or is inherited from a parent container object. (Inherited from AuthorizationRule.)|
|PropagationFlags||Gets the value of the propagation flags, which determine how inheritance of this rule is propagated to child objects. This property is significant only when the value of the InheritanceFlags enumeration is not None. (Inherited from AuthorizationRule.)|
|SemaphoreRights||Gets the rights allowed or denied by the access rule.|
|Equals(Object)||Determines whether the specified object is equal to the current object. (Inherited from Object.)|
|GetHashCode||Serves as the default hash function. (Inherited from Object.)|
|GetType||Gets the Type of the current instance. (Inherited from Object.)|
|ToString||Returns a string that represents the current object. (Inherited from Object.)|
The class is one of a set of classes that the .NET Framework provides for managing Windows access control security on named system semaphores. For an overview of these classes, and their relationship to the underlying Windows access control structures, see SemaphoreSecurity.
Windows access control security is meaningful only for named system semaphores. If a Semaphore object represents a local semaphore, access control is irrelevant.
To get a list of the rules currently applied to a named semaphore, use the Semaphore::GetAccessControl method to get a SemaphoreSecurity object, then use its GetAccessRules method to obtain a collection of objects.
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 a semaphore, 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 read the current list of rules, it might not look exactly like the list of all the rules you have added.
Use objects to specify access rights to allow or deny to a user or group. A object always represents either allowed access or denied access, never both.
To apply a rule to a named system semaphore, use the Semaphore::GetAccessControl method to get the SemaphoreSecurity object. Modify the SemaphoreSecurity object by using its methods to add the rule, and then use the Semaphore::SetAccessControl method to reattach the security object.
Changes you make to a SemaphoreSecurity object do not affect the access levels of the named semaphore until you call the Semaphore::SetAccessControl method to assign the altered security object to the named semaphore.
objects are immutable. Security for a semaphore is modified using the methods of the SemaphoreSecurity 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.
The following code example demonstrates the separation between Allow rules and Deny rules, and shows the combination of rights in compatible rules. The example creates a SemaphoreSecurity object, adds rules that allow and deny various rights for the current user, and displays the resulting pair of rules. The example then allows new rights for the current user and displays the result, showing that the new rights are merged with the existing Allow rule.
Windows 8.1, Windows Server 2012 R2, 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.