ADO.NET 2.0 中的新增 DataSet 功能--性能提高44倍？(GridView VS Datagrid)

ADO.NET 2.0 中的新增 DataSet 功能--MSDN（downmoon翻译成Csharp）
　　原文地址： http://www.microsoft.com/china/MSDN/library/data/dataAccess/adonetdatasetenhance.mspx?mfr=true

 　本文主要帮助读者了解有关 .NET Framework DataSet 类以及与它密切相关的类中的新增 ADO.NET 2.0 功能的知识。这些更改包括对 DataSet、DataTable 和 DataView 类的功能和性能增强。

　　因为原文代码用的是vb.net，阅读起来不便，邀月翻译成Csharp2005,方便大家阅读。呵呵！

  private   void  button1_Click( object  sender, EventArgs e)
         ... {
            //下列代码在vs2005下执行40秒！
            //在vs2003下执行30分钟！！增加44倍！！
            DataSet ds = new DataSet();
            System.DateTime time1 = new System.DateTime();
            System.TimeSpan ts = new TimeSpan();
            System.Timers.Timer tm = new System.Timers.Timer();
            tm.Enabled = true;
            tm.Interval = 1000;
            int i;
            int SPsecond = 0;
            DataRow dr;
            ds.Tables.Add("BigTable");
            ds.Tables[0].Columns.Add("ID", Type.GetType("System.Int32"));
            ds.Tables[0].Columns["ID"].Unique = true;
            ds.Tables[0].Columns.Add("Value", Type.GetType("System.Int32"));
            WaitLabel.Visible = true;
            this.Cursor = Cursors.WaitCursor;
            this.Refresh();
            time1 = DateTime.Now;
            Random rand = new Random();
            //Random ri = new Random(unchecked((int)DateTime.Now.Ticks));
            int value;
            for (int k = 1; k <= 1000000; k++)
            ...{
                try
                ...{
                    value = rand.Next();
                    dr = ds.Tables[0].NewRow();
                    dr["ID"] = value;
                    dr["Value"] = value;
                    ds.Tables[0].Rows.Add(dr);
                }
                catch (Exception ex)
                ...{
                }
            }
            WaitLabel.Visible = false;
            this.Cursor = this.DefaultCursor;
            ts = DateTime.Now - time1;
            SPsecond = ts.Seconds;
            MessageBox.Show("Elapsed Time: " + SPsecond.ToString() + "  Seconds");
            MessageBox.Show("count = " + ds.Tables[0].Rows.Count);
        }
         private   void  button2_Click( object  sender, EventArgs e)
         ... {
            XMLFormat();
        }
         private   void  XMLFormat()
         ... {
            DataSet ds = new DataSet();
            System.Data.SqlClient.SqlDataAdapter da = new System.Data.SqlClient.SqlDataAdapter("select * from [order details]", GetConnectionString());
            da.Fill(ds);
            System.Runtime.Serialization.Formatters.Binary.BinaryFormatter bf = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();
            string FileName = "c:\" + DateTime.Now.ToString("yyyyMMddhhmmsslll") + "xml20.txt";
            System.IO.FileStream fs = new System.IO.FileStream(FileName, System.IO.FileMode.CreateNew);
            bf.Serialize(fs, ds);
            MessageBox.Show("生成成功" + FileName + " " + "文件大小(b)：" + fs.Length.ToString());
        }
         private   void  BinaryFormat()
         ... {
            DataSet ds = new DataSet();
            System.Data.SqlClient.SqlDataAdapter da = new System.Data.SqlClient.SqlDataAdapter("select * from [order details]", GetConnectionString());
            da.Fill(ds);
            
            //下句使生成数据减少80%左右
            ds.RemotingFormat = SerializationFormat.Binary;

            System.Runtime.Serialization.Formatters.Binary.BinaryFormatter bf = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();
            string FileName = "c:\" + DateTime.Now.ToString("yyyyMMddhhmmsslll") + "Binary20.txt";
            System.IO.FileStream fs = new System.IO.FileStream(FileName, System.IO.FileMode.CreateNew);

            bf.Serialize(fs, ds);
            MessageBox.Show("生成成功" + FileName + " " + "文件大小(b)：" + fs.Length.ToString());

        }
         private   string  GetConnectionString()
         ... {
            //return MySettings.Value.NorthwindConnection;
            return "server=10.0.0.121;database=northwind;uid=sa;pwd=sa";
        }
         private   void  button3_Click( object  sender, EventArgs e)
         ... {
            BinaryFormat();
        }
         private   void  button4_Click( object  sender, EventArgs e)
         ... {
            getGridViewData();
        }
         private   void  getGridViewData()
         ... {
            try
            ...{
                SqlConnection connection = new SqlConnection(GetConnectionString());
                SqlCommand command = new SqlCommand("SELECT * from customers", connection);
                connection.Open();
                System.Data.SqlClient.SqlDataReader dr = command.ExecuteReader();
                //Fill table with data from DataReader
                System.Data.DataTable dt = new DataTable();
                dt.Load(dr, LoadOption.OverwriteChanges);

                // Display the data
                dataGridView1.DataSource = dt;

            }

            catch (SqlException ex)
            ...{
                MessageBox.Show(ex.Message);

            }
        }

　　邀月总结：2.0对1.1的改进，不仅在DataSet，同样在GridView对于DataGrid性能的改进。应尽量摒弃Datagrid!这也是微软在2.0下默认不加载DataGrid的原因。