C# DataAdapter.fill()很慢

这两天发现用从数据库里面取数据时，要过四五秒才会把数据显示在DataGridView上，测试一下原来是DataAdapter.fill()要很久时间，而不是语句从数据库里面取数据慢。

private void BtSelectOutputdata_Click(object sender, EventArgs e)   /*查询按钮*/
        {
            string source ="Provider=Microsoft.Jet.OleDb.4.0;" "data source=E:\\MyProgram\\CsAccess\\ConnectAccess\\data.mdb";
            total_page = 77777;
           
          
            using(OleDbConnection conn =new OleDbConnection(source))
            {
               conn.Open();

              
               cur_page = 0;
               string str_total = "select count(*) from result";    /*计算总页数*/
               OleDbCommand cmd_total = new OleDbCommand(str_total, conn);
               total_page = Convert.ToInt32(cmd_total.ExecuteScalar())/NUM_PER_PAGE;
               
               LbReturn.Text = total_page.ToString();

               string select = "select top " NUM_PER_PAGE.ToString() " * from ";/*查询数据 */
               select = @"(";
               string select = @"select  top " (NUM_PER_PAGE * (cur_page 1)).ToString() " * from result order by 日期 desc";
               select = @")";
               select = @"order by 日期 asc";
              
               DataTable dt = new DataTable();
              
               OleDbDataAdapter da = new OleDbDataAdapter(select, conn);
               MessageBox.Show("before fill");
               da.Fill(dt);              /*这里很慢*/
               MessageBox.Show("fill over");

               dataGridView1.DataSource=dt;
              
               conn.Close();
               
            }
        }

 

上面两个消息框中间数据就隔了四五秒。

谢谢朋友告诉我用下面的方法。

解决方法：用DataReader来填充DataSet，不用DataAdapter。

看我的另外一篇。有时间再贴上来。其实直接google一样。