如何在我的方法运行的同时加载进度条

Question

我有一个长时间运行的方法，所以我创建了一个进度条来显示我的方法完成的百分比，但我很难弄清楚如何做到这一点，将我的进度条与我的方法同步 => excelHelper.InsertNewRows(); 。public void ButtonSubmit_Click(object sender, EventArgs e){    if (isProcessRunning)    {        MessageBox.Show("A Process is aleady running");        return;    }    Thread backgroundThread = new Thread(        new ThreadStart(() =>        {            for (int n = 0; n < 100; n++)            {                isProcessRunning = true;                Thread.Sleep(50);                progressBar1.Invoke(                    new Action(() =>                    {                        progressBar1.Value = n;                        label3.Text = ("Progress: " + n + "%");                    }                 ));            }            MessageBox.Show("Thread completed!");            progressBar1.Invoke(                new Action(() =>                {                    progressBar1.Value = 0;                }                ));            isProcessRunning = false;        }        ));    backgroundThread.Start();    excelHelper.InsertNewRows();    var folder = TextOutputFile.Text + @"\" +    DateTime.Now.ToString("yyyy_MM_dd_") + "SA_Analysis_Report.xlsx";    excelHelper.Save(folder);    MessageBox.Show("File has been added to file");}

Answer 1

excelHelper.InsertNewRows();在我看来，你的问题是，工作线程和进度条线程之间没有任何通信。两个线程都在运行，没有任何有关另一个线程及其进度的信息。

您可以重写后台线程，因此它能够将百分比作为参数，该参数在您调用线程时显示。

例如伪代码：

public void progressbarThread(int percentage) 

{

    // Invoke the percentage to your progressbar, then terminate this thread

}

public void InsertNewRows() 

{

    // Do something...

    // 10%

    Thread backgroundThread = new Thread(new ThreadStart(() => progressBarThread(10)));

    backgroundThread.Start();

    // Do something...

    // 50%

    Thread backgroundThread = new Thread(new ThreadStart(() => progressBarThread(50)));

    backgroundThread.Start();

    // etc. etc.

}

Answer 2

肯定有资源可以帮助您解决这个问题，但是我花了大约 2 天的时间来解决这个问题，所以我将在这里帮助您并减轻您的头痛。进度条本身位于主 UI 线程下（就像表单中的任何对象一样），需要由主线程处理。无论你想做什么，都可以通过这样的线程来处理

    String a, b;
    a = txtUsername.Text;
    b = txtPassword.Password;
    Thread Login = new Thread(() => CompleteLogin(a, b));
    InversePbVisibility();
    Login.Start();

InversePbVisibility() 方法将被您正在执行的使进度条对用户可见的任何操作所替换。附带说明一下，在声明的线程上运行的任何方法都只能传递变量，而不能传递主线程控制下的任何内容。

Answer 3

I use this form class: -

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace Yournamespace

{

    public partial class frmProgressBar : Form

    {

        public Action Worker { get; set; }

        System.Diagnostics.Stopwatch watch = System.Diagnostics.Stopwatch.StartNew();

        public const long MINIMUM_DISPLAY_TIME = 300;    // Minimum time to display the progress bar is 300 milliseconds

        public frmProgressBar(Action worker)

        {

            InitializeComponent();

            if(worker == null)

            {

                throw new ArgumentNullException();

            }

            Worker = worker;

        }

        protected override void OnLoad(EventArgs e)

        {

            base.OnLoad(e);

            Task.Factory.StartNew(Worker).ContinueWith(t => { this.Close(); }, TaskScheduler.FromCurrentSynchronizationContext());

        }

        protected override void OnClosed(EventArgs e)

        {

            // the code that you want to measure comes here

            watch.Stop();

            var elapsedMs = watch.ElapsedMilliseconds;

            if (elapsedMs < MINIMUM_DISPLAY_TIME) //ensure progress bar is displayed for at least 100 milliseconds, otherwise it just looks like the parent main form glitches.

            {

                long lDelay = MINIMUM_DISPLAY_TIME - elapsedMs;

                Thread.Sleep((int)lDelay);

            }

        }

    }

}

The form design looks like this : -

[![enter image description here][1]][1]

  [1]: https://i.stack.imgur.com/n4XqU.jpg

And I call it like this: -

            using (Yournamespace.frmProgressBar frm = new Yournamespace.frmProgressBar(Yourprocess))

            {

                frm.ShowDialog(this);

            }

Yourprocess is the code that you want to execute that is causing the delay.

The main problem with this implementation is Yourprocess cannot return a value or take parameters. I am sure the code can be changed to accomodate this but I did not have time so I use globals to pass in data and to see results(shame on me).

This is not my code, although I have modified it, came from a you tube video - Wait Form Dialog.

编辑。我忘了说我将表单设置为 100% 不透明度，因此每当我使用它时，进度条似乎都会漂浮在我的 winform 上方。