Reporting Progress from Async Tasks c#

public async void StartProcessingButton_Click(object sender, EventArgs e) { // The Progress<T> constructor captures our UI context, // so the lambda will be run on the UI thread. var progress = new Progress<int>(percent => { textBox1.Text = percent + "%"; }); // DoProcessing is run on the thread pool. await Task.Run(() => DoProcessing(progress)); textBox1.Text = "Done!"; } public void DoProcessing(IProgress<int> progress) { for (int i = 0; i != 100; ++i) { Thread.Sleep(100); // CPU-bound work if (progress != null) progress.Report(i); } }

public async Task DownloadFileAsync(string fileName, IProgress<int> progress) { using (var fileStream = ...) // Open local file for writing using (var ftpStream = ...) // Open FTP stream { while (true) { var bytesRead = await ftpStream.ReadAsync(...); if (bytesRead == 0) return; await fileStream.WriteAsync(...); if (progress != null) progress.Report(bytesRead); } } }

using System;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
 
namespace ProgressBarDemo
{
    public partial class Form3 : Form
    {
        public Form3()
        {
            InitializeComponent();
        }
 
        public void DoSomething(IProgress<int> progress)
        {
            for (int i = 1; i <= 100; i++)
            {
                Thread.Sleep(100);
                if (progress != null)
                    progress.Report(i);
            }
        }
 
        private async void btnStart_Click(object sender, EventArgs e)
        {
            progressBar1.Value = 0;
            var progress = new Progress<int>(percent =>
            {
                progressBar1.Value = percent;
 
            });
            await Task.Run(() => DoSomething(progress));
        }
    }
}

Posted by: Guest on September-29-2020

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