指示灯控件
using System; using System.Drawing; using System.Threading; using System.Threading.Tasks; using System.Windows.Forms; namespace 指示灯 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } Task task; CancellationTokenSource tokenSource = new CancellationTokenSource(); private void button1_Click(object sender, EventArgs e) { label1.Visible = true; label1.Text = "●";//如果觉得太小调label1字体大小 if (task == null || task.IsCompleted) { task = new Task(new Action(run),tokenSource.Token); task.Start(); } } private void button2_Click(object sender, EventArgs e) { tokenSource.Cancel(); label1.Visible = false; } private void run() { while (true) { if (label1.ForeColor == Color.Red) { label1.ForeColor = Color.Green; } else { label1.ForeColor = Color.Red; } Thread.Sleep(300); } } } }