using System;

using System.Net;

//固定 每周三六 的晚上19:25開獎

//當呼叫這隻函數時候，要能取得最近的下一次開獎時間

private DateTime GetNextLottoKickoffTime(DateTime sourceDateTime)

{

    var dateger = sourceDateTime;

    switch (dateger.DayOfWeek)

    {

        case DayOfWeek.Wednesday:

        {

            var result = DateTime.Compare(dateger,

                                          new DateTime(dateger.Year, dateger.Month, dateger.Day, 19, 25, 00));

            return result < 0 ? 

                new DateTime(dateger.Year, dateger.Month, dateger.Day, 19, 25, 00) : 

            new DateTime(dateger.Year, dateger.Month, dateger.Day, 19, 25, 0).AddDays(3);

        }

        case DayOfWeek.Saturday:

        {

            var result = DateTime.Compare(dateger,

                                          new DateTime(dateger.Year, dateger.Month, dateger.Day, 19, 25, 00));

            return result < 0 ? 

                new DateTime(dateger.Year, dateger.Month, dateger.Day, 19, 25, 00) : 

            new DateTime(dateger.Year, dateger.Month, dateger.Day, 19, 25, 0).AddDays(4);

        }

    }

    if (

        new List<DayOfWeek>(new[] { DayOfWeek.Thursday, DayOfWeek.Friday, }).Contains(

            dateger.DayOfWeek))

    {

        var offset = 6 - (int)dateger.DayOfWeek;

        return new DateTime(dateger.Year, dateger.Month, dateger.Day, 19, 25, 0).AddDays(offset);

    }

    if (!new List<DayOfWeek>(new[] { DayOfWeek.Sunday, DayOfWeek.Monday, DayOfWeek.Tuesday }).Contains(

        dateger.DayOfWeek)) 

    {

        var offset = 3 - ((int)dateger.DayOfWeek);

        return new DateTime(dateger.Year, dateger.Month, dateger.Day, 19, 25, 0).AddDays(offset);

    }else{

        return dateger;

    }

}