private void timer1_Tick(object sender, EventArgs e)
{
int iCHour = Convert.ToInt32(numericUpDown1.Value);//设定的小时
int iCMinute = Convert.ToInt32(numericUpDown2.Value);//设定的分钟
int iCSecond = Convert.ToInt32(numericUpDown3.Value);//设定的秒
int iHour = DateTime.Now.Hour;//当前小时
int iMinute = DateTime.Now.Minute;//当前分钟
int iSecond = DateTime.Now.Second;//当前秒
int iTotalSecond = iCHour * 3600 + iCMinute * 60 + iCSecond - iHour * 3600 - iMinute * 60 - iSecond;//当前时间距设定时间的秒数
textBox4.Text = Convert.ToString(iTotalSecond % 60);//剩余秒
textBox3.Text = Convert.ToString(iTotalSecond % 3600/60);//剩余分钟
textBox2.Text = Convert.ToString(iTotalSecond / 3600);//剩余小时
if (textBox4.Text.Trim() == "0" && textBox3.Text.Trim() == "0" && textBox2.Text.Trim()=="0")
{
//倒计时时间到
}
}
