Optional HttpPostedFileBase in ASP.NET MVC

Question

I have an ASP.NET Web API written in MVC. I have a post action with some optional arguments.

public Guid PostExecution(string Action, List<Guid> ComputersIDs, int Port = 0, string Command = null, string Password = null)

It works perfectly. Now I need this action to receive an optional file sent through the post method.

So:

public Guid PostExecution(string Action, List<Guid> ComputersIDs, int Port = 0, string Command = null, string Password = null, HttpPostedFileBase file = null)

The interesting thing is that when I add the parameter HttpPostedFileBase the servers stops the responds the requests to this action and only says Error 500 Internal Server error. It doesn't thrown any exception. With a breakpoint the code doesn't enter to the PostExecution .

Why does this happen?

How can I debug this error?

Is it possible to have an optional HttpPostedFileBase ?

Answer 1

all posted files are optional!

and you can get them by Request.Files , and you don't need to have them in methods parameter