实现效果:

知识运用:
Environment类的TickCount属性 //获取系统启动后经过的毫秒数
public static int TickCount { get; }
实现代码:
private void timer1_Tick(object sender, EventArgs e)
{
textBox1.Text = GetResult(Environment.TickCount);
}
private string GetResult(long l)
{
int s = 0;
int m = 0;
int h = 0;
s = (int)(l / 1000);
if (s > 60)
{
m = s / 60;
s = s % 60;
}
if (m > 60)
{
h = m / 60;
m = m % 60;
}
return " "+h + "时" + m+"分" +s+ "秒";
}
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