WebApi.UnityDependencyResolver 未实现 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;
                }
            }
        }
    }
}

ad 得到以下异常：

The type Unity.WebApi.UnityDependencyResolver does not appear to implement Microsoft.Practices.ServiceLocation.IServiceLocator. Parameter name: 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);

现在你明白问题所在了：

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），但您尝试将它们都分配给同类型 (UnityDependencyResolver) 显然不能工作。

Answer 2

我遇到了类似的问题，但就我而言，我的 Web 应用程序具有 MVC 和 WebApi 控制器。 我是这样解决的：

using Microsoft.Practices.Unity;
using System.Web.Http;
using System.Web.Mvc;
using Unity.Mvc5;

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

第一行将使用 MVC DependencyResolver，第二行我使用 WebApi UnityDependencyResolver。