ASP. net mvc 1.0-8. TempData

Controller. TempData is the temporary data storage point during Redirect operations.

Reference content is as follows: Public class TestController: Controller { Public ActionResult Index () { TempData ["a"] = "abcd "; Return RedirectToAction ("T2 "); } Public ActionResult T2 () { Return Content (TempData ["a"]. ToString ()); } }

But the process is not over. If we want to pass the data in TempData from T2 to T3, what will happen?

Reference content is as follows: Public class TestController: Controller { Public ActionResult Index () { TempData ["a"] = "abcd "; Return RedirectToAction ("T2 "); } Public ActionResult T2 () { Return RedirectToAction ("T3 "); } Public ActionResult T3 () { Return Content (TempData ["a"]. ToString ()); } }

The result is the following error message.

Reference content is as follows: Server Error in '/'application. -------------------------------------------------------------------------------- Object reference not set to an instance of an object. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System. NullReferenceException: Object reference not set to an instance of an object. Source Error: Line 24: public ActionResult T3 () Line 25 :{ Line 26: return Content (TempData ["a"]. ToString ()); Line 27 :} Line 28 :}

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