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static void Main(string[] args)

{

    using (var writer = new StreamWriter(WatchSqlPath, false, Encoding.UTF8))

    {

        using (DbAppDataContext db = new DbAppDataContext())

        {

            db.Log = writer;

            //设置延时加载属性为true

            db.DeferredLoadingEnabled = true;

            //获得一个Student

            var aStudent = db.Students.First();

            //直接访问Student的Class属性ClassName

            Console.WriteLine("{0}属于{1}",aStudent.Name ,aStudent.Class.ClassName);

        }

    }

    Console.ReadLine();

}