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

 
阅读更多

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,EventArgse)
... {
//下列代码在vs2005下执行40秒!
//在vs2003下执行30分钟!!增加44倍!!

DataSetds = new DataSet();
System.DateTimetime1
= new System.DateTime();
System.TimeSpants
= new TimeSpan();
System.Timers.Timertm
= new System.Timers.Timer();
tm.Enabled
= true ;
tm.Interval
= 1000 ;
int i;
int SPsecond = 0 ;
DataRowdr;
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;
Randomrand
= new Random();
// Randomri=newRandom(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 (Exceptionex)
... {
}

}

WaitLabel.Visible
= false ;
this .Cursor = this .DefaultCursor;
ts
= DateTime.Now - time1;
SPsecond
= ts.Seconds;
MessageBox.Show(
" ElapsedTime: " + SPsecond.ToString() + " Seconds " );
MessageBox.Show(
" count= " + ds.Tables[ 0 ].Rows.Count);
}

private void button2_Click( object sender,EventArgse)
... {
XMLFormat();
}

private void XMLFormat()
... {
DataSetds
= new DataSet();
System.Data.SqlClient.SqlDataAdapterda
= new System.Data.SqlClient.SqlDataAdapter( " select*from[orderdetails] " ,GetConnectionString());
da.Fill(ds);
System.Runtime.Serialization.Formatters.Binary.BinaryFormatterbf
= new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();
string FileName = " c:/ " + DateTime.Now.ToString( " yyyyMMddhhmmsslll " ) + " xml20.txt " ;
System.IO.FileStreamfs
= 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()
... {
DataSetds
= new DataSet();
System.Data.SqlClient.SqlDataAdapterda
= new System.Data.SqlClient.SqlDataAdapter( " select*from[orderdetails] " ,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.BinaryFormatterbf
= new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();
string FileName = " c:/ " + DateTime.Now.ToString( " yyyyMMddhhmmsslll " ) + " Binary20.txt " ;
System.IO.FileStreamfs
= 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()
... {
// returnMySettings.Value.NorthwindConnection;
return " server=10.0.0.121;database=northwind;uid=sa;pwd=sa " ;
}

private void button3_Click( object sender,EventArgse)
... {
BinaryFormat();
}

private void button4_Click( object sender,EventArgse)
... {
getGridViewData();
}

private void getGridViewData()
... {
try
... {
SqlConnectionconnection
= new SqlConnection(GetConnectionString());
SqlCommandcommand
= new SqlCommand( " SELECT*fromcustomers " ,connection);
connection.Open();
System.Data.SqlClient.SqlDataReaderdr
= command.ExecuteReader();
// FilltablewithdatafromDataReader
System.Data.DataTabledt = new DataTable();
dt.Load(dr,LoadOption.OverwriteChanges);

// Displaythedata
dataGridView1.DataSource = dt;

}


catch (SqlExceptionex)
... {
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。

助人等于自助! 3w@live.cn

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