System.Web.Mvc.ActionFilterAttribute vs System.Web.Http.Filters.ActionFilterAttribute

Question

i see that there are two version of ActionFilterAttribute class.
System.Web.Mvc.ActionFilterAttribute and System.Web.Http.Filters.ActionFilterAttri

Answer 1

The System.Web.Http one is for Web API; the System.Web.Mvc one is for previous MVC versions.

You can see from the source that the Web API version has several differences.

• It has OnResultExecuting and OnResultExecuted handlers ("Called by the ASP.NET MVC framework before/after the action result executes.")
• It can be executed asynchronously
• It does not let you specify an order of execution