知识大全 ADO.NET 2.0 Dataset和Datatable 新功能新

Posted 2022-07-17 知

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　　新的索引引擎更快的执行效率下面这段代码在中需要秒在中只要秒就可以完成

　　DataSet ds = new DataSet();

　　ds Tables Add( BigTable ); ds Tables[ ] Columns Add( ID Type GetType( System Int )); ds Tables[ ] Columns[ ID ] Unique = true; ds Tables[ ] Columns Add( Value Type GetType( System Int ));

　　Cursor Current = Cursors WaitCursor;

　　DateTime datBegin = DateTime Now;

　　Random rand = new Random(); int i intValue; DataRow dr;

　　for (i = ; i <= ; i++) try intValue = rand Next();

　　dr = ds Tables[ ] NewRow();

　　dr[ ID ] = intValue; dr[ Value ] = intValue;

　　ds Tables[ ] Rows Add(dr); catch

　　Cursor Current = Cursors Default;

　　MessageBox Show( Elapsed Time: + (DateTime Now datBegin) Seconds ToString()); MessageBox Show( count = + ds Tables[ ] Rows Count ToString()); Dataset可以序列化为二进制文件 string connstr = server=(local);database=northwind;integrated security=true;async=true ;

　　DataSet ds = new DataSet(); SqlDataAdapter dadpt = new SqlDataAdapter( select * from [order details] connstr); dadpt Fill(ds);

　　BinaryFormatter bf = new BinaryFormatter(); FileStream fs = new FileStream(@ c:\\xml txt FileMode OpenOrCreate);

　　ds RemotingFormat = SerializationFormat Binary;

　　bf Serialize(fs ds); 更独立的Datatable DataTable Write XML string connstr = server=(local);database=northwind;integrated security=true;async=true ; SqlDataAdapter dadpt = new SqlDataAdapter( select * from [order details] connstr); DataTable dt = new DataTable( Customer ); dadpt Fill(dt);

　　dt WriteXml(@ c:\\DataTable xml true); dt WriteXmlSchema(@ c:\\DataTableSchema xml ); DataTable Read XML StreamReader sr = new StreamReader(@ C:\\DataTableSchema xml );

　　DataTable dt = new DataTable(); dt ReadXmlSchema(sr);

　　dt ReadXml(new StreamReader(@ c:\\dataTable xml ));

　　this dataGridView DataSource = dt; DataTable Merge string connstr = server=(local);database=northwind;integrated security=true;async=true ; SqlDataAdapter dadpt = new SqlDataAdapter( select * from customers connstr); DataTable dt = new DataTable( Customer ); dadpt Fill(dt);

　　SqlDataAdapter dadpt = new SqlDataAdapter( select * from customers connstr); DataTable dt = new DataTable( Customer ); dadpt Fill(dt );

　　dt Merge(dt );

　　this dataGridView DataSource = dt; DataTable Load DataReader string connstr = server=(local);database=northwind;integrated security=true;async=true ; SqlConnection conn = new SqlConnection(connstr); conn Open(); SqlCommand cmd = new SqlCommand( select * from [order details] conn); SqlDataReader dr = cmd ExecuteReader();

　　DataTable dt = new DataTable( Customer ); dt Load(dr);

cha138/Article/program/net/201311/13114