TransferToAction for ASP.NET MVC 5

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In addition to the RedirectToAction method inside a Controller, I want to be able to use a Server.Transfer inside my actions.
This can be useful, if you want to redirect without changing the URL(routing).
I also want to ensure that an action is only accessible by a transfer request - similar to ChildActionOnly-attribute.

After searching for an existing solution without success (not a complete solution) I came up with the following code.

The usage is very simple:

The transfer implementation is inside a custom ActionResult and can be easily called trough an extension.

To make the TransferActionOnly-attribute possible, a query string marker is used.

You can do anything you want with this code, but don’t hold me liable :)