如何将计时器时间从秒转换为分钟并显示分钟：秒？

Question

现在它只能像8..7..6 ... 5 ..秒一样倒计时，Timer1的间隔设置为1000ms 我希望如果用户将numericupdown1更改为9，那么改为像现在一样计算秒数，它会将其计为分钟并将其显示为：01（分钟）：10（秒）

这是Timer1_Tick事件的代码：

private void timer1_Tick(object sender, EventArgs e)
        {

            try
            {
                numbers_radar = Convert.ToInt64(numericUpDown1.Value);
                numbers_satellite = Convert.ToInt64(numericUpDown2.Value);
                if (numbers_radar <= 0 || numbers_satellite <= 0)
                {
                    timer1.Stop();
                    button1.Enabled = true;
                    numericUpDown1.Enabled = true;
                    numericUpDown2.Enabled = true;
                    MessageBox.Show("Value cannot be zero or below zero");
                    numericUpDown1.Text = "";
                    numericUpDown2.Text = "";
                }
                else
                {
                    Numbers_Timer_radar = Numbers_Timer_radar + 1;
                    Numbers_Timer_satellite = Numbers_Timer_satellite + 1;

                    if (Numbers_Timer_radar >= numbers_radar) 
                    {
                        try
                        {
                            filesdownload();
                            number_of_files_in_current_directory = Directory.GetFiles(sf, "radar*.png");
                            label13.Text = "Current Number Of Files In The Selected Directory Are: " + number_of_files_in_current_directory.Length;
                            button1.Enabled = false;
                            Numbers_Timer_radar = 0;
                        }
                        catch (Exception Local_Timer1_Exceptions)
                        {
                            Logger.Write("Timer1 Errors : " + Local_Timer1_Exceptions);
                        }
                    }
                    if (Numbers_Timer_satellite >= numbers_satellite)
                    {
                        satellite_downloads();
                        number_of_satellite_files_in_current_directory = Directory.GetFiles(satellite_dir, "satellite*.png");
                        label8.Text = "Current Number Of Files In The Selected Directory Are: " + number_of_satellite_files_in_current_directory.Length;
                        button1.Enabled = false;
                        Numbers_Timer_satellite = 0;
                    }
                    time_left_radar = numbers_radar - Numbers_Timer_radar;
                    time_left_satellite = numbers_satellite - Numbers_Timer_satellite;
                    //string t = GetTime((int)time_left_radar);
                    label21.Text = time_left_radar.ToString();
                    label22.Text = time_left_satellite.ToString();
                    label1.Text = "Next image radar will be download in: ";
                    label5.Text = "Next image satellite will be download in: ";
                }

            }
            catch (Exception General_Exceptions)
            {
                Logger.Write("Show if numbers have wrong string input" + numbers_radar);
                Logger.Write("Show if numbers have wrong string input" + numbers_satellite);
                timer1.Stop();
                Logger.Write("Exception: " + General_Exceptions + Environment.NewLine);
                //numericUpDown1.Clear();
                //numericUpDown2.Clear();
                button1.Enabled = true;
                numericUpDown1.Enabled = true;
                numericUpDown2.Enabled = true;
                Numbers_Timer_radar = 0;
                Numbers_Timer_satellite = 0;
            }

        }

time_left_radar和time_left_satellite都是长变量 而在label21和label22中看到秒向后计数8..7..6..etc我希望它像： 01（分钟）：10（秒）.. 01：9..01：8 ......或01：09..01：08 ...

所以它将计算分钟和秒数。

我试图在带有GetTime方法的timer1_tick事件中使用它，但它没有用。 GetTime方法代码是：

public string GetTime(int Time)
        {
            //Seconds 
            Sec = Time % 60;

            //Minutes 
            Min = ((Time - Sec) / 60) % 60;

            //Hours 
            Hrs = ((Time - (Sec + (Min * 60))) / 3600) % 60;

            return Hrs.ToString("00") + ":" +
                   Min.ToString("00") + ":" +
                   Sec.ToString("00");
        }

感谢您的帮助。