task cancel

MultiThreadingStudy/CacelTask/Form1.cs

@@ -22,12 +22,12 @@ namespace CancelTask
 
 		private void runButton_Click(object sender, EventArgs e)
 		{
-
+			Run();
 		}
 
 		private void cancelButton_Click(object sender, EventArgs e)
 		{
-
+			cancelTokenSource.Cancel();
 		}
 
 		private async void Run()
@@ -35,14 +35,28 @@ namespace CancelTask
 			cancelTokenSource = new CancellationTokenSource();
 			CancellationToken token = cancelTokenSource.Token;
 
-			Task task1 = Task.Factory.StartNew<object>(LongCalcAsync, token);
+			Task<object> task1 = Task.Factory.StartNew<object>(LongCalcAsync, token);
 
-			dynamic res = await Task;
+			dynamic res = await task1;
+			if (res != null)
+				progressText.Text = $"Sum: {res.Sum}";
+			else
+				progressText.Text = "Canceled";
 		}
 
 		private object LongCalcAsync()
 		{
+			int sum = 0;
+			for (int i = 0; i < 100; i++)
+			{
+				if (cancelTokenSource.Token.IsCancellationRequested)
+					return null;
+
+				sum += i;
+				Thread.Sleep(1000);
+			}
 
+			return new { Sum = sum };
 		}
 	}
 }