IUnityContainer.Resolve<T> throws error claiming it cannot be used with type parameters

Question

Yesterday I've implemented the code:

CustomerProductManager productsManager = container.Resolve<CustomerProductManager>();

It was compilable and working.

Today (probably I've modified something) I am constantly getting the error:

The non-generic method 'Microsoft.Practices.Unity.IUnityContainer.Resolve(System.Type, string, params Microsoft.Practices.Unity.ResolverOverride[])' cannot be used with type arguments

My collegue has the same source code and doesn't have same error. Why? How to resolve the problem?

P.S.

line "using Microsoft.Practices.Unity;" is present in usings section.

I've tried to replace generic version with non-generic one:

CustomerProductManager productsManager = (CustomerProductManager)container.Resolve(typeof(CustomerProductManager));

And got another error:

No overload for method 'Resolve' takes '1' arguments

It seems like one of the assemblies is not referenced.. but which one? I have 2 of them referenced: 1. Microsoft.Practices.Unity.dll 2. Microsoft.Practices.ServiceLocation.dll

P.P.S. I've saw similar problem http://unity.codeplex.com/WorkItem/View.aspx?WorkItemId=8205 but it is resolved as "not a bug"

Any thought will be helpful

Answer 1

I had the same problem and found the "fix" looking at Prism sample code files. Looks like, even if it is not a dll in Unity V2 you have to add a reference in your class to: Microsoft.Practices.Unity

my complete "using" section is as follow

using System;
using System.Windows;
using Microsoft.Practices.Composite.Modularity;
using Microsoft.Practices.Unity;
using Microsoft.Practices.Composite.UnityExtensions;

I'm not sure if you are using Silverlight, but the generic version for Container.Resolve IS in Microsoft.Practices.Unity.

Answer 2

Microsoft no longer owns Unity and it's in version 5, the namespace is now:

using Unity;

Ensure that is in your using section when using:

container.Resolve<T>();

Answer 3

I faced this problem and none of this answers did not help me. I was getting the compile time error

Unknown method RegisterType() of Microsoft.Practices.Unity.IUnityContainer

for my below code.

Container.RegisterType<MyInterface, MyClass>();

I found that if you did not implement IMyInterface to the class MyClass, you get this issue. Hope it resolves for you too...

Answer 4

In my situation the class I was wrapping with Unity inherited from an abstract base class, and that base class did NOT have a parameterless constructor. Once I changed my code to use a parameterless constructor for the base class, the problem disappeared.

Answer 5

In my situation, I had Bootstrapper implement its own Resolve without the generic version, so it couldn't find the Microsoft's Unity Resolve. Adding the proper usings did the trick.