Is there a cap or best practice with regards to how much data should be placed in the TempData dictionary?
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Is there a cap or best practice with regards to how much data should be placed in the TempData dictionary?
Check this post that describes best practices when using TempData:
When to use ViewBag, ViewData, or TempData in ASP.NET MVC 3 applications
This one goes even further:
ASP.NET MVC: Do You Know Where Your TempData Is?
Bottom line is: By default, TempData is stored in the Session object. So the limit is the limit of your Session object. See this post for some insight.
Things to consider:
For a more in-depth view of the Session object, check this doc at MSDN:
ASP.NET Session State Overview