Configure Unity DI for ASP.NET Identity

You also need to resolve the UserManager. The following is an example how you could do it with the UserManager and the RoleManager. In this sample I use the regular Unity 3 package instead of one of the derivates or bootstrappers (had some problems with them in the past).

AccountController

private readonly UserManager<ApplicationUser> _userManager;private readonly RoleManager<IdentityRole> _roleManager;public AccountController(IUserStore<ApplicationUser> userStore, IRoleStore<IdentityRole> roleStore){  _userManager = new UserManager<ApplicationUser>(userStore);  _roleManager = new RoleManager<IdentityRole>(roleStore);}

Unity Bootstrapper

var accountInjectionConstructor = new InjectionConstructor(new IdentitySampleDbModelContext(configurationStore));container.RegisterType<IUserStore<ApplicationUser>, UserStore<ApplicationUser>>(accountInjectionConstructor);container.RegisterType<IRoleStore<IdentityRole>, RoleStore<IdentityRole>>(accountInjectionConstructor);

As this blog post from enterpriseframework.com says:

First, add the Unity Bootstrapper for ASP.NET MVC Nuget package.

1. In your Visual Studio "Solution Explorer" > right click on your Web project's "References" node > click "Manage NuGet Packages".

2. From the left menu, choose Online > All

3. In the upper right search box > Search Online (Ctrl + E) > type "Unity bootstrapper for ASP.NET MVC".
4. Select "Unity Bootstrapper for ASP.NET MVC" and choose Install.
5. Click Close after install completes

Then Modify your-Web-project/App_Start/UnityConfig.cs file and update the using statements as follows:

    using System;    using System.Data.Entity;    using Microsoft.AspNet.Identity;    using Microsoft.AspNet.Identity.EntityFramework;    using Microsoft.Practices.Unity;    using Microsoft.Practices.Unity.Configuration;    using MicrosoftIdentity.Controllers;    using MicrosoftIdentity.Models;

Finally, in the same file, update RegisterTypes method as below:

        public static void RegisterTypes(IUnityContainer container)        {            // NOTE: To load from web.config uncomment the line below. Make sure to add a Microsoft.Practices.Unity.Configuration to the using statements.            // container.LoadConfiguration();            // TODO: Register your types here            container.RegisterType<IUserStore<ApplicationUser>, UserStore<ApplicationUser>>();            container.RegisterType<UserManager<ApplicationUser>>();            container.RegisterType<DbContext, ApplicationDbContext>();            container.RegisterType<ApplicationUserManager>();            container.RegisterType<AccountController>(new InjectionConstructor());        }

HTH

Install-Package Unity.AspNet.WebApi

You need to register Unity under the HttpConfiguration.DependencyResolver property. This allows WebApi to know that it needs to use Unity rather than reflection to instanciate your controllers.

The easiest way to do this is with the above nuget package.