計時器在單獨的線程中

Question

我想在一個單獨的線程中創建一個計時器，但是我不確定該怎么做。 單擊按鈕后，計時器應停止。

下面我有一個示例，該示例大多數情況下都有效，但是在執行循環時有時會停止1-2秒。 所以我想我必須將其放在單獨的線程中？ 這是我嘗試過的：

    private void buttonStop_Click(object sender, EventArgs e)
    {
        timer1.Stop();
    }

    public void TimeThread()
    {
        th = new Thread(new ThreadStart(Timer));
        th.Start();
    }

    public void Timer()
    {
        var delta = DateTime.Now - startTime;
        textBoxSeconds.Text = delta.Seconds.ToString("n0");
        textBoxMinutes.Text = Math.Floor(delta.TotalMinutes).ToString("n0");
    }

---

編輯：所以這是我擁有的所有代碼，仍然不確定如何將計時器放在單獨的線程中。

namespace Imgur
{
    public partial class Form1 : Form
    {
        bool flag = true;
        int downloadedNumber = 0;
        private DateTime startTime;

        public Form1()
        {
            InitializeComponent();
        }

        public void buttonStart_Click(object sender, EventArgs e)
        {
            buttonStart.Enabled = false;
            buttonStop.Enabled = true;
            if (!flag)
            {
                flag = true;
            }

            startTime = DateTime.Now;
            timer1.Start();


            for (int i=0;i<100000 && flag;i++)
            {
                WebClient webClient = new WebClient();
                string pic1 = rnd_str(5);
                string pic2 = ".jpg";
                string picture = pic1 + pic2;

                //********** GETTING SIZE OF IMAGE ***********
                Size sz = GetSize("http://i.imgur.com/" + picture);
                string imageSize = (sz.Width.ToString() + " " + sz.Height.ToString()); ;
                //********************************************

                if(imageSize != "161 81")
                {
                    webClient.DownloadFile("http://i.imgur.com/" + picture, @"e:\test\" + picture);
                    richTextBox1.Text += String.Format("Downloaded picture: {0}\r\n", picture);
                    downloadedNumber++;
                    textBoxDownloadedNumber.Text = string.Format("{0}", downloadedNumber);
                }
                webClient.Dispose();
                Application.DoEvents();
                if (i == 999995)
                {
                    flag = false;
                }
            }
            richTextBox1.Text += "End Dowloaded Session \n";
            buttonStart.Enabled = true;
            buttonStop.Enabled = false;
            timer1.Stop();
        }

        public static Size GetSize(string url)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Method = "GET";
            request.Accept = "image/gif";
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            Stream s = response.GetResponseStream();
            Bitmap bmp = new Bitmap(s);
            Size sz = new Size(bmp.Width, bmp.Height);
            return sz;
        }

        public static string rnd_str(int liczba_liter)
        {
            Random r = new Random();
            int char_type;
            string return_string = "";
            int i =0;
            for (i = 0; i < liczba_liter; i++)
            {
                if (r.Next(1, 3) == 1)
                {
                    char_type = r.Next(1, 4);
                    switch (char_type)
                    {
                        case 1:
                            return_string += (char)r.Next(48, 58); // convertion int -> ASCII character; 48-57 are ASCII digits
                            break;
                        case 2:
                            return_string += (char)r.Next(97, 123); // convertion int -> ASCII character; as above but small letters
                            break;
                        case 3:
                            return_string += (char)r.Next(65, 91); // as above; large letters
                            break;
                        default:
                            i -= 1;
                            break;//do not add any letter if no type is allowed
                    }
                }
                else
                {
                    i -= 1;
                    return_string += "";
                }
            }
            return return_string;
        }

        private void buttonStop_Click(object sender, EventArgs e)
        {
            flag = false;
            buttonStart.Enabled = true;
            timer1.Stop();
        }

        public void timer1_Tick(object sender, EventArgs e)
        {
            var delta = DateTime.Now - startTime;
            textBoxSeconds.Text = delta.Seconds.ToString("n0");
            textBoxMinutes.Text = Math.Floor(delta.TotalMinutes).ToString("n0");
        }
    }
}

Answer 1

.Net中有計時器樹，請看下面的文章，並選擇正確的計時器，看起來您需要從System.Threading而不是從System.Windows.Forms計時器。

Answer 2

在您的代碼中，計時器與經過的時間顯示之間似乎沒有聯系。 您需要注意，因為不可能從不是主線程的另一個線程更改GUI元素。 為此，您需要在WinForms中使用Invoke

if (control.InvokeRequired)
  {
    control.Invoke(new SetControlPropertyThreadSafeDelegate(SetControlPropertyThreadSafe), new object[] { control, propertyName, propertyValue });
  }
  else
  {
    control.GetType().InvokeMember(propertyName, BindingFlags.SetProperty, null, control, new object[] { propertyValue });
  }

或調度員在WPF / SL - http://www.switchonthecode.com/tutorials/working-with-the-wpf-dispatcher

為了使用另一個線程，您有一些選擇：

1. 線程池（在.Net 4上）-http: //msdn.microsoft.com/zh-cn/library/3dasc8as (v=vs.80) .aspx
2. 線程類-http://msdn.microsoft.com/zh-cn/library/aa645740(v=vs.71).aspx
3. BackgroundWorker類-http: //msdn.microsoft.com/zh-cn/library/cc221403(v=vs.95).aspx

如果您不知道如何使用ardard，則第三個選項是最簡單的