MVC保證線程內實例唯一（5）

原

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using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Text;
using Dulei.Model;


namespace Dulei.DAL
{
     public class EFDbcontextFactory
    {
         public static DbContext GetcurrentDbcontext()
         {
             //可以直接對Model模型進行切換。只要更改DataModelContainer()
             return new DataModelContainer();
         }
    }
}

改

using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Runtime.Remoting.Contexts;
using System.Runtime.Remoting.Messaging;
using System.Text;
using Dulei.Model;


namespace Dulei.DAL
{
     public class EFDbcontextFactory
    {
         public static DbContext GetcurrentDbcontext()
         {
             DbContext db = (DbContext) CallContext.GetData("Dbcontext");
             if (db==null)
             {
                 db = new DataModelContainer();
                 CallContext.SetData("Dbcontext",db);
             }
             //也可以使用HttpContext是一樣的
             return db;
         }
    }
}