Interface Injection Problem in .NET

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C#

ASP.NET

MVC

I have two project in one solution. First is MVC4 WebAPI and second in Class Library.
I have a Interface in class library. I want to implement this Injterface in WebApi.

public interface IAuthorize
    {
        bool IsAuthorize(HttpActionContext actionContext, AuthorizedUser user);
    }

I have implement this function in class library. I want to call IsAuthorized function there whic have implemnt in Web APi.

public override void OnAuthorization(HttpActionContext actionContext)
        {
}

Please help me...........