c# - WebApi.UnityDependencyResolver 没有实现 Microsoft.Practices.ServiceLocation.IServiceLocator。参数 : commonServiceLocator

Question

我尝试运行以下代码:

using System.Web.Http;
using System.Web.Mvc;
using Conduit.Mam.ClientSerivces.Dal.Configuration;
using MamInfrastructure.Common.Dal;
using MamInfrastructure.Common.Logger;
using MamInfrastructure.Logger;
using Microsoft.Practices.Unity;
using Unity.WebApi;

namespace Conduit.Mam.ClientServices.Common.Initizliaer
{
    public static class Initializer
    {
        private static bool isInitialize;
        private static readonly object LockObj = new object();
        private static IUnityContainer defaultContainer = new UnityContainer();

        static Initializer()
        {
            Initialize();
        }

        public static void Initialize()
        {
            if (isInitialize)
                return;

            lock (LockObj)
            {
                IUnityContainer container = defaultContainer;

                //registering Unity for web API
                GlobalConfiguration.Configuration.DependencyResolver = new UnityDependencyResolver(container);
                //registering Unity for MVC
                DependencyResolver.SetResolver(new UnityDependencyResolver(container));

                container.RegisterType<IDal<ClientService.DAL.EntityFramework.MamConfiguration>, MamConfigurationDal>();
                container.RegisterType<IApplicationLogger, Log4NetLogger>();

                if (!isInitialize)
                {
                    isInitialize = true;
                }
            }
        }
    }
}

广告得到以下异常:

Unity.WebApi.UnityDependencyResolver 类型似乎没有实现 Microsoft.Practices.ServiceLocation.IServiceLocator。
参数名称:commonServiceLocator

我尝试安装 webApi 包，但没有帮助

Answer 1

在您的 Initialize 方法中替换:

GlobalConfiguration.Configuration.DependencyResolver = new UnityDependencyResolver(container);

与:

GlobalConfiguration.Configuration.DependencyResolver = new Unity.WebApi.UnityDependencyResolver(container);

现在你明白问题是什么了:

System.Web.Http.Dependencies.IDependencyResolver (由 Web API 使用)和 System.web.Mvc.IDependencyResolver (由 ASP.NET MVC 使用)是两种完全不同的类型(即使它们具有相同的名称)，但您试图将它们都分配给相同的类型(UnityDependencyResolver)，这显然是行不通的。