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。

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