C#比较优雅的实现时分秒显示

int totalTime;//  秒

var seconds = (int)(totalTime% 60);
var minutes = (int)(totalTime/ 60) % 60;
var hours = (int)(totalTime/ 3600) % 60;
var string = string.Format("{0:00}:{1:00}:{2:00}",hours,minutes,seconds);