MVC 创建线程内的db单例

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using LSUnion.Site.Models;

namespace LSUnion.Site.WebHelper
{
    using System.Runtime.Remoting.Messaging;
    public class Factory
    {
        public static LSUnionEntities GetDbContext()
        {
            object db = CallContext.GetData("LSUnionEntities");
            if (db==null)
            {
                db = new LSUnionEntities();
                CallContext.SetData("LSUnionEntities",db);
            }
            return db as LSUnionEntities;
        }
    }
}