Linq To Sql 与ADO.NET

简单测试

1：使用DataContacxt 捞取Customers数据

            int iStar = System.Environment.TickCount;
            DataContext dc = new DataContext("Server = .;uid=sa;pwd=p7zx5dez;database=Northwind");
            Table<Customer> _Table = dc.GetTable<Customer>();
            this.dataGridView1.DataSource = from c in _Table  select new { 客户编号 = c.CustomerID, 客户名称 = c.Name, 客户城市 = c.City };
            int iEnd = System.Environment.TickCount;
            this.txtUseTime.Text = ("Star:" + iStar.ToString() + " End:" + iEnd.ToString() + " Use Time:" + (iEnd - iStar).ToString() + " 毫秒");

2：使用ADO捞取数据量一样的数据

            int iStar = System.Environment.TickCount;
            using (SqlConnection Conn = new SqlConnection("Server = .;uid=sa;pwd=p7zx5dez;database=NorthWind"))
            {
                DataTable _Table = new DataTable();
                using (SqlDataAdapter Adapter = new SqlDataAdapter("Select * from Customers", Conn))
                {
                    Adapter.Fill(_Table);
                    this.dataGridView1.DataSource = _Table;
                }
            }
            int iEnd = System.Environment.TickCount;
            this.txtUseTime.Text = ("Star:" + iStar.ToString() + " End:" + iEnd.ToString() + " Use Time:" + (iEnd - iStar).ToString() + " 毫秒");

总结:第一次捞取DataContaxt使用的时间相对会比ADO慢

      多次测试，发现DataContaxt捞取耗时没有变化，ADO则会编号

     说明DataContaxt是有缓存功能的