Difference Between ViewResult() and ActionResult()

ActionResult is an abstract class that can have several subtypes.

ActionResult Subtypes

• ViewResult - Renders a specifed view to the response stream

• PartialViewResult - Renders a specifed partial view to the response stream

• EmptyResult - An empty response is returned

• RedirectResult - Performs an HTTP redirection to a specifed URL

• RedirectToRouteResult - Performs an HTTP redirection to a URL that is determined by the routing engine, based on given route data

• JsonResult - Serializes a given ViewData object to JSON format

• JavaScriptResult - Returns a piece of JavaScript code that can be executed on the client

• ContentResult - Writes content to the response stream without requiring a view

• FileContentResult - Returns a file to the client

• FileStreamResult - Returns a file to the client, which is provided by a Stream

• FilePathResult - Returns a file to the client

Resources

• What's the difference between ActionResult and ViewResult for action method? [ASP.NET Forums]

ActionResult is an abstract class.

ViewResult derives from ActionResult. Other derived classes include JsonResult and PartialViewResult.

You declare it this way so you can take advantage of polymorphism and return different types in the same method.

e.g:

public ActionResult Foo()
{
   if (someCondition)
     return View(); // returns ViewResult
   else
     return Json(); // returns JsonResult
}

It's for the same reason you don't write every method of every class to return "object". You should be as specific as you can. This is especially valuable if you're planning to write unit tests. No more testing return types and/or casting the result.