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Csdn dotnet blog 专家群 ghd258 1.新的索引引擎更快的执行效率
下面这段代码在2003中需要157秒，在2005中只要11秒就可以完成：
 DataSet ds = new DataSet();
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"));
Cursor.Current = Cursors.WaitCursor;
DateTime datBegin = DateTime.Now;
Random rand = new Random();
int i, intValue;
DataRow dr;
for (i = 1; i <= 500000; i++)
   {
 try
  {
intValue = rand.Next();
dr = ds.Tables[0].NewRow();
dr["ID"] = intValue;
dr["Value"] = intValue;
ds.Tables[0].Rows.Add(dr);
 }
catch { }
 }
Cursor.Current = Cursors.Default;
MessageBox.Show("Elapsed Time: " + (DateTime.Now - datBegin).Seconds.ToString());
MessageBox.Show("count = " + ds.Tables[0].Rows.Count.ToString());
2.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(@&quo[1] [2] 下一页 |
