MVC模式下unity配置，即DI（依賴註入）& IOC（控制反轉）> 報錯“No connection string named '**Context' could be found in the application config file”

　　 寫在前面： 第一次配置時好好的，後來第二次改到MVC模式，把依賴註入寫成字典的單例模式時，由於新建的ORM（資料庫映射模型EF），怎麼弄都不用，一直報錯"No connection string named '**Context' could be found in the application config file"（配置文件中找不到資料庫context連接）調試了兩小天問題，終於想到了是沒有把EF模型中appconfig中的資料庫連接複製到項目webconfig中導致的！！！改過之後果然好了，豁然開朗！

　　中間也發現了一個小的點：調試的時候因為配置有問題，就改成不用配置直接寫的方式：（如下）

            UnityContainer container = new UnityContainer();
             container.RegisterType<DbContext, JDContext>();
            container.RegisterType<IBaseService, BaseService>();
            container.RegisterType<IUserMenuService, UserMenuService>();

            IBaseService baseService = container.Resolve<IBaseService>();
            IUserMenuService userservice = container.Resolve<IUserMenuService>();
            JD_User a = userservice.Set<JD_User>().FirstOrDefault();        

然後就報錯BaseService是抽象類 不能實例化。 後來發現 這句不需要寫出來
IBaseService baseService = container.Resolve<IBaseService>();

因為 IUserMenuService 繼承了 IBaseService    實現IUserMenuService的時候自然就把基類帶出來了實現了。  

困惑了一天半 終於解決了。

以下是DI工廠實現

namespace Common
{
    public class DIFactory
    {
        private static object _syncHelper = new object();
        private static Dictionary<string, IUnityContainer> _UnityContainerDic = new Dictionary<string, IUnityContainer>();

        public static IUnityContainer GetContainer(string containerName = "JDContainer")
        {
            if (!_UnityContainerDic.ContainsKey(containerName))
            {
                lock (_syncHelper)
                {
                    if (!_UnityContainerDic.ContainsKey(containerName))
                    {
                        IUnityContainer container = new UnityContainer();
                        ExeConfigurationFileMap fileMap = new ExeConfigurationFileMap();
                        fileMap.ExeConfigFilename = Path.Combine(AppDomain.CurrentDomain.BaseDirectory + "CfgFiles\\Unity.Config.xml");
                        Configuration configuration = ConfigurationManager.OpenMappedExeConfiguration(fileMap, ConfigurationUserLevel.None);
                        UnityConfigurationSection section = (UnityConfigurationSection)configuration.GetSection(UnityConfigurationSection.SectionName);
                        section.Configure(container, containerName);

                        _UnityContainerDic.Add(containerName, container);
                    }
                }
            }
            return _UnityContainerDic[containerName];
        }
    }
}

以下是unity文件配置  （即上文代碼中的 Unity.Config.xml ）

<configuration>
  <configSections>
    <section name="unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection, Microsoft.Practices.Unity.Configuration"/>
  </configSections>
  <unity>
    <sectionExtension type="Microsoft.Practices.Unity.InterceptionExtension.Configuration.InterceptionConfigurationExtension, Microsoft.Practices.Unity.Interception.Configuration"/>
    <containers>
      <container name="JDContainer">
        <!--<register type="Interface.ITest, Interface" mapTo="Service.Test, Service" />-->
        <register type="System.Data.Entity.DbContext, EntityFramework" mapTo="EF.Model.JDContext, EF.Model"/>
        <register type="Interface.IBaseService, Interface" mapTo="Service.BaseService, Service" />
        <register type="Interface.IUserMenuService, Interface" mapTo="Service.UserMenuService, Service" />
      </container>
      <!--<container name="testContainer">
        <register type="Interface.ITest, Interface" mapTo="Service.Test, Service" />
        <register type="System.Data.Entity.DbContext, EntityFramework" mapTo="EF.yuncaidbEntities, EF"/>
        <register type="Interface.IBaseService, Interface" mapTo="Service.BaseService, Service" />
        <register type="Interface.IUserService, Interface" mapTo="Service.UserService, Service" />
      </container>-->
    </containers>
  </unity>
</configuration>