我如何在MVC4中获得TempData对象识别

Question

I have an ActionMethod that creates TempData object

TempData["Message"] = new Message {Text = txtMessage, Success = false};

Then I read the TempData in the view like

@{var message = TempData["Message"];}

But when I try to use the var "message.Success" the compiler doesn't recognize the property. When I watch the var message and TempData during debug I can see the Object's txtMessage and Success value. What am I missing?

Answer 1

try

@{dynamic message = TempData["Message"];}

or

@{Message message = TempData["Message"] as Message;}

or, if you know it will only ever be a Message

@{Message message = (Message)TempData["Message"];}

Answer 2

I don't believe TempData is dynamically typed, so you need to cast it. However, with an anonymous type, you cannot do that. You will need to convert your anonymous type to an actual class.

If you don't want to do this, you might be able to use ViewBag instead, which is dynamically typed.