Xunit The following constructor parameters did not have matching fixture data

问题:

I keep getting this error while using xunit for .NET 1.0 framework net46.

The following constructor parameters did not have matching fixture data 

I have seen this post: Collection fixture won't inject and followed the instructions regarding collection fixture closely as described here:

http://xunit.github.io/docs/shared-context.html#collection-fixture

Nothing seems to work.

Any suggestions to what might cause this?

回答1:

In my case it turned out to be a matter of doing it right according to the instructions. By mistake I had annotated the class with

 [Collection("ProjectCollection")] 

instead of:

 [Collection("ActorProjectCollection")] 

I must say that the dependency injection mechanism of XUnit would be greatly improved if the error messages gave more explicit hint of what is wrong.

回答2:

Another scenario in which this might fail is if the [CollectionDefinition] is defined on a type outside the executing test assembly. The attribute itself needs to be defined inside of it or xUnit won't pick it up.

回答3:

This exception may arise when the constructor of your fixture class is failing due to some other problem, in my case connecting to a local Mongo server.

Either look for other failures and solve those first or lighten your constructor up so it does less.

回答4:

It happened to me a couple of times just after adding the Collection and the CollectionDefinition decorators and I always arrive to this answer when looking on Internet.

But in my case the problem was just that it seems that a 'Clean Solution' action is needed before testing whether it works or not. Without cleaning the solution I always get a The following constructor parameters did not have matching fixture data error.

So, I write also this answer in order to help my future self.

---

Anyway, in order to avoid the problem explained by Nikola Schou, you can always use a constant to avoid name mistmatching:

public static class Collections {     public const string ActorProjectCollection= "ActorProjectCollection"; } 

-

[Collection(Collections.ActorProjectCollection)] /// ... 

-

[CollectionDefinition(Collections.ActorProjectCollection)] /// ... 

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