How ViewBag in ASP.NET MVC works

Question

How does the ASP.NET MVC\'s ViewBag work? MSDN says it is just an Object, which intrigues me, how does \"Magic\" properties such as ViewBag.F

Answer 1

ViewBag is of type dynamic. More, you cannot do ViewBag["Foo"]. You will get exception - Cannot apply indexing with [] to an expression of type 'System.Dynamic.DynamicObject'.

Internal implementation of ViewBag actually stores Foo into ViewData["Foo"] (type of ViewDataDictionary), so those 2 are interchangeable. ViewData["Foo"] and ViewBag.Foo.

And scope. ViewBag and ViewData are ment to pass data between Controller's Actions and View it renders.