Represents the base class for all action-filter attributes.
Assembly: System.Web.Mvc (in System.Web.Mvc.dll)
Thetype exposes the following members.
|Equals||Infrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)|
|Finalize||Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)|
|GetHashCode||Returns the hash code for this instance. (Inherited from Attribute.)|
|GetType||Gets the Type of the current instance. (Inherited from Object.)|
|IsDefaultAttribute||When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute.)|
|Match||When overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)|
|MemberwiseClone||Creates a shallow copy of the current Object. (Inherited from Object.)|
|OnActionExecuted||Called by the MVC framework after the action method executes.|
|OnActionExecuting||Called by the MVC framework before the action method executes.|
|OnResultExecuted||Called by the MVC framework after the action result executes.|
|OnResultExecuting||Called by the MVC framework before the action result executes.|
|ToString||Returns a string that represents the current object. (Inherited from Object.)|
|_Attribute.GetIDsOfNames||Maps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.)|
|_Attribute.GetTypeInfo||Retrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.)|
|_Attribute.GetTypeInfoCount||Retrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.)|
|_Attribute.Invoke||Provides access to properties and methods exposed by an object. (Inherited from Attribute.)|
Typically, you create an action filter by creating an attribute class that inherits from the abstract FilterAttribute class. Some built-in action filters, such as AuthorizeAttribute and HandleErrorAttribute, inherit from the FilterAttribute class. The action filters that derive from FilterAttribute are always called before the action method runs.
Other action filters, such as OutputCacheAttribute, inherit from the abstract class, which enables the action filter to run either before or after the action method runs.
You can use action filter attributes to mark any action method or controller. If the attribute marks a controller, the action filter applies to all action methods in that controller.
For more information about using attributes, see Extending Metadata Using Attributes.
The following example shows how to create a simple action filter that logs trace messages before and after an action method is called.
Public Class LoggingFilterAttribute Inherits ActionFilterAttribute Public Overrides Sub OnActionExecuting(ByVal filterContext As ActionExecutingContext) filterContext.HttpContext.Trace.Write("(Logging Filter)Action Executing: " + _ filterContext.ActionDescriptor.ActionName) MyBase.OnActionExecuting(filterContext) End Sub Public Overrides Sub OnActionExecuted(ByVal filterContext As ActionExecutedContext) If Not filterContext.Exception Is Nothing Then filterContext.HttpContext.Trace.Write("(Logging Filter)Exception thrown") End If MyBase.OnActionExecuted(filterContext) End Sub End Class