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  1. using System.Drawing;
  2. using System.Linq;
  3. using System.Text;
  4. using System.Threading;
  5. using System.Threading.Tasks;
  6. using System.Windows.Forms;
  7.  
  8. namespace WindowsFormsApplication1
  9. {
  10.     public partial class Form1 : Form
  11.     {
  12.         Random random = new Random();
  13.         public Form1()
  14.         {
  15.             InitializeComponent();
  16.         }
  17.  
  18.         private void Form1_Load(object sender, EventArgs e)
  19.         {
  20.             var t = new Thread(StartWork);
  21.             t.Start();
  22.         }
  23.  
  24.         public void StartWork()
  25.         {
  26.             var threads = new List<Thread>();
  27.  
  28.  
  29.             for (int i = 0; i < 1000; i++)
  30.             {
  31.                 var t = new Thread(() =>
  32.                 {
  33.                     Thread.Sleep(random.Next(1, 500));
  34.                     StopProgress();
  35.                 });
  36.                 threads.Add(t);
  37.             }
  38.             threads.ForEach(t => t.Start());
  39.         }
  40.  
  41.         public void StopProgress()
  42.         {
  43.             if (InvokeRequired)
  44.             {
  45.                 Invoke(new MethodInvoker(StopProgress));
  46.                 return;
  47.             }
  48.  
  49.             progressBar1.Visible = random.Next() % 2 == 0;
  50.         }
  51.     }
  52. }
  53.  
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https://ideone.com/e7FQpv
language:
C# (gmcs 5.20.1)
created:
10 years ago
visibility:
public

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