多线程获取数据库数据

/// <summary>
/// 根据SQL语句返回实体集合，这里不能返回IQueryable，否则在线程中会获取不到上下文对象
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="sql"></param>
/// <returns></returns>
public static List<T> GetModelList<T>(string sql)
{
    using (RoomsEntities rooms = new RoomsEntities())
    {
        return rooms.Database.SqlQuery<T>(sql).ToList();
    }
}

//开始计时
Stopwatch sw = new Stopwatch();
sw.Start();
string sqlMember = "";
string sqlRoom = "";
List<Member> MemberList = null;
List<Room> RoomList = null;
using (RoomsEntities rooms = new RoomsEntities())
{
    var queryMember = rooms.Member.Where(u => u.IsStop == false);
    sqlMember = queryMember.ToString(); //这里ToString()后取到的是SQL语句
    var queryRoom = rooms.Room.Take(10);
    sqlRoom = queryRoom.ToString();
}
//开启两个线程执行
Task t1 = Task.Factory.StartNew(() =>
{
    MemberList = GetModelList<Member>(sqlMember);
});
Task t2 = Task.Factory.StartNew(() =>
{
    RoomList = GetModelList<Room>(sqlRoom);
});
Task.WaitAll(t1, t2); //等待两个线程完成，这里等待的t1,t2线程是同时执行的
sw.Stop();
TimeSpan ts2 = sw.Elapsed;
Console.WriteLine("运行时间：" + ts2.TotalMilliseconds);
Console.ReadKey();