Cant resolve instance with Unity container

Question

I register an instance with Unity like this:

ContentSlideControlsEntity contentSlideControlsEntity = new ContentSlideControlsEntity(new Queue<uint>());
        container.RegisterInstance(typeof(ContentSlideControlsEntity), "contentSlideControlsEntity", contentSlideControlsEntity);

And then I simply want to reslove it:

ContentSlideControlsEntity contentSlideControlsEntity2 = container.Resolve<ContentSlideControlsEntity>();

but I get the following runtime error:

Microsoft.Practices.Unity.ResolutionFailedException: 'Resolution of the dependency failed, type = "MSDataLayer.Entities.ContentSlideControlsEntity", name = "(none)".

Exception occurred while: while resolving.

Exception is: InvalidOperationException - The type Queue`1 has multiple constructors of length 1. Unable to disambiguate.

At the time of the exception, the container was:

Resolving MSDataLayer.Entities.ContentSlideControlsEntity,(none)

Resolving parameter "slideIDQueue" of constructor MSDataLayer.Entities.ContentSlideControlsEntity(System.Collections.Generic.Queue`1[[System.UInt32, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]] slideIDQueue)
Resolving System.Collections.Generic.Queue`1[System.UInt32],(none)

RB. · Accepted Answer · 2017-06-20 16:40:08Z

1

You registered your instance as a named registration, but you are resolving the unnamed registration (which doesn't exist).

container.RegisterInstance(typeof(ContentSlideControlsEntity), "contentSlideControlsEntity", contentSlideControlsEntity);
                                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

You have 2 options:

1) Don't register it as a named registraion

container.RegisterInstance(typeof(ContentSlideControlsEntity), contentSlideControlsEntity);

2) Resolve it with a name

container.Resolve<ContentSlideControlsEntity>("contentSlideControlsEntity");

answered Jun 20, 2017 at 16:40

RB.

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