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

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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

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