Question

我需要在c＃中将计数计时器添加到DataGridView。当我运行时，它只计算datagridview中最后一行的单元格中的值。计时器列中的所有其他单元格显示为零

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

找到答案我将计时器放在form_load方法中，并通过将timer1_Tick datagridview方法添加到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(); }事件方法

中来刷新datagridview

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如何将计数定时器添加到datagridview单元格C＃

1 个答案: