Task.Factory.StartNew未調用方法

Question

我是C＃併發新手，嘗試帶有兩個按鈕的基本應用程序，第一個按鈕點擊應激活一個方法，該方法經過一個for循環並且下一個按鈕單擊即使應該取消

Task t; 
CancellationTokenSource tokenSource = new CancellationTokenSource(); 
bool cancelPressed = false; 

private void button1_Click(object sender, EventArgs e) 
{ 
    var tasks = new ConcurrentBag<Task>(); 
    var token = tokenSource.Token; 
    t = Task.Factory.StartNew(() => Count(token), token); 

    if (cancelPressed) 
    { 
     tokenSource.Cancel(); 
    } 

    tasks.Add(t); 
    Task.WaitAll(tasks.ToArray()); 
} 

private void Count(CancellationToken token) 
{ 
    for (int a = Int32.MinValue; a < Int32.MinValue; a++) 
    { 
     textBox1.Text = a.ToString(); 
     if (token.IsCancellationRequested) 
      break; 
    } 
} 

private void button2_Click(object sender, EventArgs e) 
{ 
    cancelPressed = true; 
} 

但它Count()沒有被解僱。這裏有什麼問題？

Answer 1

您的循環條件是錯誤導致循環內的代碼不被excuted，改變a < Int32.MinValue到a < Int32.MaxValue

像這樣：

for (int a = Int32.MinValue; a < Int32.MaxValue; a++)