context.Configuration.ProxyCreationEnabled = false;

  //用于被继承

     public class BaseController : Controller

     {

         public CucuCarEntity db

         {

             get

             {

                 //从当前线程中获取该对象

                 CucuCarEntity db = CallContext.GetData("DB") as CucuCarEntity;

                 //判断该对象是否为空

                 if (db == null)

                 {

                     //空的话就实例该对象

                     db = new CucuCarEntity();

                     //赋值

                     CallContext.SetData("DB", db);

                 }

                 //序列化类型为“System.Data.Entity.DynamicProxies.ActionInfo_”的对象时检测到循环引用。 加上这个就OK了

                 db.Configuration.ProxyCreationEnabled = false;

                 //返回

                 return db;

             }

         }

     }