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  1. 			var worker = new BackgroundWorker()
  2. 			{
  3. 				WorkerReportsProgress = true,
  4. 				WorkerSupportsCancellation = true,
  5. 			};
  6.  
  7. 			var form = new Form();
  8. 			var statusStrip = new StatusStrip();
  9. 			var toolStripProgressBar = new ToolStripProgressBar()
  10. 			{
  11. 				Minimum = 0,
  12. 				Maximum = 10,
  13. 			};
  14. 			statusStrip.Items.Add(toolStripProgressBar);
  15.  
  16. 			var cancelButton = new Button()
  17. 			{
  18. 				Location = new Point(110, 0),
  19. 				Size = new Size(100, 50),
  20. 				Text = "Cancel",
  21. 				Enabled = false,
  22. 			};
  23. 			cancelButton.Click += (sender, e) =>
  24. 			{
  25. 				if (!worker.IsBusy) return;
  26. 				cancelButton.Enabled = false;
  27. 				worker.CancelAsync();
  28. 			};
  29.  
  30.  
  31. 			var button = new Button()
  32. 			{
  33. 				Size = new Size(100, 50),
  34. 				Text = "Start",
  35. 			};
  36. 			button.Click += (sender, e) =>
  37. 			{
  38. 				if (worker.IsBusy) return;
  39. 				button.Enabled = false;
  40. 				cancelButton.Enabled = true;
  41. 				worker.RunWorkerAsync(null);
  42. 			};
  43.  
  44.  
  45.  
  46. 			form.Controls.Add(statusStrip);
  47. 			form.Controls.Add(button);
  48. 			form.Controls.Add(cancelButton);
  49.  
  50. 			form.Load += (x, y) =>
  51. 			{
  52. 				worker.DoWork += (sender, e) =>
  53. 				{
  54. 					// e.Result;
  55. 					var args = e.Argument;
  56.  
  57. 					for (int i = 0; i < 10; i++)
  58. 					{
  59. 						if (worker.CancellationPending)
  60. 						{
  61. 							e.Cancel = true;
  62. 							return;
  63. 						}
  64.  
  65. 						worker.ReportProgress(i, null);
  66. 						Thread.Sleep(1000);
  67.  
  68. 						if (i == 5)
  69. 						{
  70. 							throw new ApplicationException();
  71. 						}
  72. 					}
  73. 				};
  74. 				worker.RunWorkerCompleted += (sender, e) => 
  75. 				{
  76. 					toolStripProgressBar.Value = toolStripProgressBar.Minimum;
  77. 					button.Enabled = true;
  78. 					cancelButton.Enabled = false;
  79.  
  80. 					if (null != e.Error)
  81. 					{
  82. 						System.Windows.Forms.MessageBox.Show(form, e.Error.ToString(), e.Error.Message, MessageBoxButtons.OK, MessageBoxIcon.Error);
  83. 						return;
  84. 					}
  85. 					if (e.Cancelled)
  86. 					{
  87. 						MessageBox.Show(form, "処理はキャンセルされました。", "処理のキャンセル");
  88. 						return;
  89. 					}
  90. 					// e.Result
  91. 					// e.UserState
  92. 					MessageBox.Show(form, "処理が終了しました。", "終了");
  93. 				};
  94.  
  95. 				worker.ProgressChanged += (sender, e) =>
  96. 				{
  97. //					var userState = e.UserState;
  98. 					toolStripProgressBar.Value = e.ProgressPercentage;
  99. 				};
  100. 			};
  101.  
  102. 			Application.Run(form);
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https://ideone.com/pgTDs
language:
C# (gmcs 5.20.1)
created:
12 years ago
visibility:
public

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