MVC模式下unity配置，报错“No connection string named '**Context' could be found in the application config file”

　　 写在前面： 第一次配置时好好的，后来第二次改到MVC模式，把依赖注入写成字典的单例模式时，由于新建的ORM（数据库映射模型EF），怎么弄都不用，一直报错"No connection string named '**Context' could be found in the application config file"（配置文件中找不到数据库context连接）调试了两小天问题，终于想到了是没有把EF模型中appconfig中的数据库连接复制到项目webconfig中导致的！！！改过之后果然好了，豁然开朗！

　　中间也发现了一个小的点：调试的时候因为配置有问题，就改成不用配置直接写的方式：（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();        

然后就报错BaseService是抽象类 不能实例化。 后来发现 这句不需要写出来
IBaseService baseService = container.Resolve<IBaseService>();

因为 IUserMenuService 继承了 IBaseService    实现IUserMenuService的时候自然就把基类带出来了实现了。  

困惑了一天半 终于解决了。

以下是DI工厂实现

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  （即上文代码中的 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>