What is the scope of TempData in ASP.NET MVC?

Question

I would like to know what the scope of TempData is in ASP.NET MVC.

Answer 1

According to MSDN, TempData, an instance of TempDataDictionary is available in classes that derive from ControllerBase , ViewContext, and ViewPage . Data is saved only during one round: set in one request, deleted after the next request.

Answer 2

For others ... ASP.NET MVC 2 has made some changes to TempData. Below is a blog post . In short:

... The result of the changes led to the following rules that determine how TempData works:

• Items are only deleted with TempData at the end of the query if they were marked for deletion.
• Items are marked for deletion only when they are read.
• Elements can be untagged by calling TempData.Keep(key) .
• RedirectResult and RedirectToRouteResult always calls TempData.Keep() .

Answer 3

TempData is not available (set to null) in views using post-cache substitution (HttpResponse.WriteSubstitution () method). See ASP.NET MVC Donut Caching and TempData for more details.