比如：當前時間到下周二 05:00:00還剩下多少秒？

 1 /// <summary>
 2 /// 計算距離下一個 周XX XX時XX分XX秒，還剩下多少秒
 3 /// </summary>
 4 /// <param name="currDateTime">當時間</param>
 5 /// <param name="dayWeek">目標星期</param>
 6 /// <param name="str_HourMinuteSecond">目標時間,時分秒的字符串格式 "05:00:00"</param>
 7 /// <param name="totalSeconds">
 
計算結果:還剩下的總秒數</param>
 8 void CalEndTimeSeconds(DateTime currDateTime, DayOfWeek dayWeek, string str_HourMinuteSecond, out int totalSeconds)
 9 {
10     totalSeconds = 0;
11     TimeSpan tp = new TimeSpan();
12     if (TimeSpan.TryParse(str_HourMinuteSecond, out tp))
13     {
14         int
 
 endPointSeconds = (int)tp.TotalSeconds;
15 
16         int currDayPassSeconds = (int)currDateTime.TimeOfDay.TotalSeconds;
17 
18         //當天還剩下的秒數
19         totalSeconds = currDayPassSeconds <= endPointSeconds ? (endPointSeconds - currDayPassSeconds) : (perDaySeconds - currDayPassSeconds);
 
20 
21         if (currDateTime.DayOfWeek > dayWeek)
22         {
23             int days = 7 - (int)currDateTime.DayOfWeek;
24             totalSeconds += days * perDaySeconds;
25             totalSeconds += endPointSeconds;
26         }
27         else if (currDateTime.DayOfWeek == dayWeek)
28         {
29             totalSeconds += 0;
30         }
31         else
32         {
33             int days = (int)(dayWeek - currDateTime.DayOfWeek) - 1;
34             totalSeconds += days * perDaySeconds;
35             totalSeconds += endPointSeconds;
36         }
37     }
38 }

C#_計算目前時間到指定的周X、指定的時間X 還有多少秒