13.4.3.2 使用线程来实现闹钟功能

public partial class Form1 : Form
{
Thread threadClock;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
this.threadClock = new Thread(new ThreadStart(Timer_Tick));
//this.threadClock.IsBackground = true;
this.threadClock.Start();
}
private void Timer_Tick()
{
//Label lblClock = new Label();
//this.Controls.Add(lblClock);
while (true)
{
DateTime t = DateTime.Now;
lblClock.Font = new Font("宋体", 15);
lblClock.Text = t.ToString();
//8点1分1秒叫你起床
if (t.Hour == 8 && t.Minute==1 && t.Second == 1)
{
MessageBox.Show("懒猪,该起床了!");
}
Thread.Sleep(1000);
}

}
private void Form1_FormClosed(object sender, FormClosedEventArgs e)
{
this.threadClock.Abort();
}
}

Label lblClock = new Label();
this.Controls.Add(lblClock);

public partial class Form1 : Form
{
Thread threadClock;
//定义Invoke方法使用的委托
private delegate void UpdateTextDelegate();
......
private void Timer_Tick()
{
Runtime_UpdateUI();/*调用Invoke方法的方法*/
while (true)
{

}

    }
private void Runtime_UpdateUI()
{
//假如需要调用Invoke方法
if (this.InvokeRequired)
{
UpdateTextDelegate update =
new UpdateTextDelegate(this.Runtime_UpdateUI);
this.Invoke(update);
}
else
{
Label lblClock = new Label();
this.Controls.Add(lblClock);
}
}
}

private void Runtime_SetMessage(string msg)
{
UpdateTextDelegate update = new UpdateTextDelegate(this.Runtime_SetMessage);
object[] args = new object[1] { msg };
if (this.txtBox.InvokeRequired)
{
//调用带参数的委托，使用object对象数组作为参数
this. txtBox.Invoke(update, args);
}
else
{
this. txtBox.Text = msg;
}
}