如何添加計數器到datagridview單元格C＃

Question

我需要在c＃中添加向上計數器到DataGridView。當我運行時，它只會在datagridview的最後一行的單元格中計數值。的所有其它細胞在計時器列顯示零

private void fillTodayPatientsTable() 
{ 
    string connectionString = "Server=localhost\\sqlexpress;Database=dental;User Id=sa;Password=abc123;"; 
    using (SqlConnection myConnection = new SqlConnection(connectionString)) 
    { 
     string id = ""; 
     string firstname = ""; 
     string lastname = ""; 
     string startTime = ""; 
     DateTime attendedTime = DateTime.Now; 
     string oString = "Select id,firstname,lastname,start_time,attended_time from Appointments"; 
     SqlCommand oCmd = new SqlCommand(oString, myConnection); 
     myConnection.Open(); 
     using (SqlDataReader oReader = oCmd.ExecuteReader()) 
     { 
      if (oReader.HasRows) 
      { 
       DataTable dttable = new DataTable(); 
       DataColumn column; 


       column = new DataColumn(); 
       // column.DataType = System.Type.GetType("System.Int32"); 
       column.DataType = System.Type.GetType("System.String"); 
       column.ColumnName = "Firstname"; 
       dttable.Columns.Add(column); 

       column = new DataColumn(); 
       column.DataType = Type.GetType("System.String"); 
       column.ColumnName = "Lastname"; 
       dttable.Columns.Add(column); 

       column = new DataColumn(); 
       column.DataType = Type.GetType("System.String"); 
       column.ColumnName = "Start time"; 
       dttable.Columns.Add(column); 

       column = new DataColumn(); 
       column.DataType = Type.GetType("System.String"); 
       column.ColumnName = "Attended time"; 
       dttable.Columns.Add(column); 

       lbl.ForeColor = Color.Black; 
       lbl.Font = new Font("TimesRoman", 12, FontStyle.Bold); 
       dgStyle.GridColumnStyles.Add(dgLabel); 
       dgLabel.HeaderText = "Label Column"; 
       dgLabel.MappingName = "Name"; 
       dgLabel.Width = 200; 
       dgStyle.PreferredRowHeight = 24; 

       dttable.Columns.Add("Timer"); 

       labelll = new Label(); 
       col = col = new DataGridViewLabelCellColumn(); 

       int counter = 0; 


       while (oReader.Read()) 
       { 
        id = oReader["id"].ToString(); 
        firstname = oReader["firstname"].ToString(); 
        lastname = oReader["lastname"].ToString(); 
        startTime = oReader["start_time"].ToString(); 
        attendedTime = (DateTime) oReader["attended_time"]; 
        double attendedTimeStamp= (attendedTime - new DateTime(1970, 1, 1).ToLocalTime()).TotalSeconds; 
        double DateNowTimeStamp = (DateTime.Now - new DateTime(1970, 1, 1).ToLocalTime()).TotalSeconds; 
        int waitingTime =(int) (DateNowTimeStamp - attendedTimeStamp); 



        row = dttable.NewRow(); 
        row["Firstname"] = firstname; 
        row["Lastname"] = lastname; 
        row["Start time"] = startTime; 
        row["Attended time"] = attendedTime; 
        row["Timer"] = (waitingTime+counter).ToString(); 
        timer1.Tick += new EventHandler(timer1_Tick); 
        dttable.Rows.Add(row); 
        countTest++; 

        timer1 = new Timer(); 
        timer1.Interval = 1000; // 1 second 
        timer1.Start();       


        dgvTodayPatient.DataSource = dttable; 

       } 
      } 
      myConnection.Close(); 
     } 
    } 
} 

private void timer1_Tick(object sender, EventArgs e) 
{ 
    counter++; 
    if (counter ==60*60*24) 
    timer1.Stop(); 
    row["Timer"] = counter.ToString(); 

} 

Answer 1

找到此 答案我把定時器的Form_Load方法內，並通過加入的datagridview的datafilling方法進timer1_Tick事件方法刷新的datagridview

private void fillTodayPatientsTable() 
     { 
      string connectionString = "Server=localhost\\sqlexpress;Database=dental;User Id=sa;Password=abc123;"; 
      using (SqlConnection myConnection = new SqlConnection(connectionString)) 
      { 
       string id = ""; 
       string firstname = ""; 
       string lastname = ""; 
       string startTime = ""; 
       DateTime attendedTime = DateTime.Now; 
       string oString = "Select id,firstname,lastname,start_time,attended_time from Appointments"; 
       SqlCommand oCmd = new SqlCommand(oString, myConnection); 
       myConnection.Open(); 
       using (SqlDataReader oReader = oCmd.ExecuteReader()) 
       { 
        if (oReader.HasRows) 
        { 
         DataTable dttable = new DataTable(); 
         DataColumn column; 


         column = new DataColumn(); 
         // column.DataType = System.Type.GetType("System.Int32"); 
         column.DataType = System.Type.GetType("System.String"); 
         column.ColumnName = "Firstname"; 
         dttable.Columns.Add(column); 

         column = new DataColumn(); 
         column.DataType = Type.GetType("System.String"); 
         column.ColumnName = "Lastname"; 
         dttable.Columns.Add(column); 

         column = new DataColumn(); 
         column.DataType = Type.GetType("System.String"); 
         column.ColumnName = "Start time"; 
         column.MaxLength = 200; 
         dttable.Columns.Add(column); 

         column = new DataColumn(); 
         column.DataType = Type.GetType("System.String"); 
         column.ColumnName = "Attended time"; 
         dttable.Columns.Add(column); 

         lbl.ForeColor = Color.Black; 
         lbl.Font = new Font("TimesRoman", 12, FontStyle.Bold); 
         dgStyle.GridColumnStyles.Add(dgLabel); 
         dgLabel.HeaderText = "Label Column"; 
         dgLabel.MappingName = "Name"; 
         dgLabel.Width = 200; 
         dgStyle.PreferredRowHeight = 24; 

         dttable.Columns.Add("Timer"); 

         col = col = new DataGridViewLabelCellColumn(); 

         //int counter = 0; 


         while (oReader.Read()) 
         { 
          id = oReader["id"].ToString(); 
          firstname = oReader["firstname"].ToString(); 
          lastname = oReader["lastname"].ToString(); 
          startTime = oReader["start_time"].ToString(); 
          attendedTime = (DateTime) oReader["attended_time"]; 
          double attendedTimeStamp= (attendedTime - new DateTime(1970, 1, 1).ToLocalTime()).TotalSeconds; 
          double DateNowTimeStamp = (DateTime.Now - new DateTime(1970, 1, 1).ToLocalTime()).TotalSeconds; 
          int waitingTime =(int) (DateNowTimeStamp - attendedTimeStamp); 

          row = dttable.NewRow(); 
          row["Firstname"] = firstname; 
          row["Lastname"] = lastname; 
          row["Start time"] = startTime; 
          row["Attended time"] = attendedTime; 
          //row["Timer"] = (counter).ToString(); 

          TimeSpan t = TimeSpan.FromSeconds(waitingTime); 

          string waitingTimeFormatted = string.Format("{0:D2}h:{1:D2}m:{2:D2}s", 
              t.Hours, 
              t.Minutes, 
              t.Seconds, 
              t.Milliseconds); 
          row["Timer"] = waitingTimeFormatted; 

          dttable.Rows.Add(row); 
          countTest++; 

          dgvTodayPatient.DataSource = dttable; 

         } 
        } 
        myConnection.Close(); 

       }       

      } 

     }   
     private void timer1_Tick(object sender, EventArgs e) 
     { 
      counter++; 
      if (counter == 60 * 60 * 24) 
       timer1.Stop(); 
      // row["Timer"] = counter.ToString(); 
      fillTodayPatientsTable(); 
     } 


     private void TodayPatient_Load(object sender, EventArgs e) 
     { 

      fillTodayPatientsTable(); 
      System.Windows.Forms.Timer timer1 = new System.Windows.Forms.Timer(); 
      timer1.Interval = 1000; 
      timer1.Tick += new EventHandler(timer1_Tick); 
      timer1.Start(); 


     }