系统运行时间悬浮框（demo）

此项目基于.net framework 4.0

思路： 拖一个定时器控件，每秒执行一次，调用函数查询当前运行时间并更新到label控件。

private void Form1_Load(object sender, EventArgs e)
{
    int runningSecond = Environment.TickCount / 1000;

    int days = runningSecond / 86400;

    int hours = runningSecond / 3600;
    int minutes = (runningSecond - hours * 3600) / 60;
    int second = (runningSecond - hours * 3600 - minutes * 60);

    this.label1.Text = String.Format("系统已经运行了{0}天{1}小时{2}分钟{3}秒", days, hours, minutes, second);

}

///
/// 定时器： 每秒执行一次
///
///
///
private void timer1_Tick(object sender, EventArgs e)
{

    int runningSecond = Environment.TickCount / 1000;

    int days = runningSecond / 86400;

    int hours = runningSecond / 3600;
    int minutes = (runningSecond - hours * 3600) / 60;
    int second = (runningSecond - hours * 3600 - minutes * 60);

    this.label1.Text = String.Format("系统已经运行了{0}天{1}小时{2}分钟{3}秒", days, hours, minutes, second);
}