C# 委托 Action<T>

 1         Thread BackgroundThread;
 2         private void button1_Click(object sender, EventArgs e)
 3         {
 4             if (BackgroundThread == null)
 5             {
 6                 BackgroundThread = new Thread(new ThreadStart(ThreadMethod));
 7                 BackgroundThread.IsBackground = true;
 8                 BackgroundThread.Start();
 9             }
10         }
11         
12         void ThreadMethod()
13         {
14             int value = 0;
15             Action<int> UiDelegate = delegate(int DisValue)
16             {
17                 label24.Text = DisValue.ToString();
18             };
19             while (true)
20             {
21                 value++;
22                 label24.Invoke(UiDelegate, value);
23                 Thread.Sleep(1000);
24             }
25         }