ProgressBar2/Program.cs

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using System;
using System.Text;
using System.Threading;

namespace ProgressBar2
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.Write("Performing some task... ");
            using (var progress = new ProgressBar())
            {
                for (int i = 0; i <= 100; i++)
                {
                    progress.Report((double)i / 100);
                    Thread.Sleep(20);
                }
            }
            Console.WriteLine("Done.");
        }
    }

    /// <summary>
    /// An ASCII progress bar
    /// </summary>
    public class ProgressBar : IDisposable, IProgress<double>
    {
        private const int blockCount = 10;
        private readonly TimeSpan animationInterval = TimeSpan.FromSeconds(1.0 / 8);
        private const string animation = @"|/-\";

        private readonly Timer timer;

        private double currentProgress = 0;
        private string currentText = string.Empty;
        private bool disposed = false;
        private int animationIndex = 0;

        public ProgressBar()
        {
            timer = new Timer(TimerHandler);

            // A progress bar is only for temporary display in a console window.
            // If the console output is redirected to a file, draw nothing.
            // Otherwise, we'll end up with a lot of garbage in the target file.
            if (!Console.IsOutputRedirected)
            {
                ResetTimer();
            }
        }

        public void Report(double value)
        {
            // Make sure value is in [0..1] range
            value = Math.Max(0, Math.Min(1, value));
            Interlocked.Exchange(ref currentProgress, value);
        }

        private void TimerHandler(object state)