Why does RedirectToAction give a NullReferenceException when unit testing controller method?

Question

I'm writing a unit test for a controller in .Net Framework 4.5.2 but I'm getting a NullReferenceException when this line is hit:

return RedirectToAction<MyController>(action => action.Edit(itemId), "Something");

However, when I change it (and nothing else) to

return RedirectToAction("Edit", "Something", new { myId = itemId });

it works perfectly.

Any ideas why this would be?

Md Rahatur Rahman · Accepted Answer · 2020-04-20 10:44:56Z

1

Dependency injection configured in your project? That might be the reason.

For Unit test try to inject HttpContext in a mock controller object. Sample code is available here: https://stackoverflow.com/a/2497618/218408

answered Apr 20, 2020 at 10:44

Md Rahatur Rahman

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4 Comments

Astrum97 Over a year ago

Yes, dependency injection is done using Unity. I've tried injecting the HttpContext, but no luck.

Md Rahatur Rahman Over a year ago

Could you figure out on which line or object is throwing the null reference?

Astrum97 Over a year ago

It is definitely on the return line posted in the original question, but it seems that all the objects are initialized correctly. I also tried stepping into it whilst debugging, but it simply throws the exception.

Marc van Nieuwenhuijzen Over a year ago

Did you fix this? If so, what was the cause?

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