我拥有的是什么;
我试图将所有周末排除在已故的时间之外，所以我有一个列表，其中包含所有日期和时间（没有周末日期），因为我需要时间。
for weekendDates：
// Build list of weekdates and weekend dates
List<DateTime> weekDates = new List<DateTime>();
List<DateTime> weekendDates = new List<DateTime>();
int days = (EndDate - StartDate).Days;
for (int i = 0; i < days; i++)
{
DateTime date = StartDate.AddDays(i);
if (date.DayOfWeek == DayOfWeek.Saturday || date.DayOfWeek == DayOfWeek.Sunday)
{
weekendDates.Add(date);
continue;
}
weekDates.Add(date);
}
迟到的名单：
var fetchAllrec = (from m in db.D2L
where m.RId == ENum && m.Date >= StartDate && m.Date <= EndDate
select m).Distinct();
var onerecord = fetchAllrec
.GroupBy(dt => dt.Date)
.Select(z => z.OrderBy(y => y.Date).FirstOrDefault())
.ToList();
//All the dates he was late compared to his AT
var late = (from d in onerecord
where d.DateTime.Value.Hour >= ArT
select d).ToList();
WithoutWeekends：
//All the late dates without weekends
IEnumerable<DateTime> lateDateTimeList = late.Select(m => m.DateTime.Value).ToList();
//^^^Change this to m.Date to get the 'latDateTimeList' dates without weekends but then it wont calculate
//the minutes since it will have all the Dates in the 'lateDateTimeList' ONLY!
IEnumerable<DateTime> lateDateTimeWithoutWeekendsList = lateDateTimeList.Except(weekendDates).ToList();
//get latecoming DateTimes list here
var lateComings = new List<DateTime>();
foreach (var g in lateDateTimeWithoutWeekendsList)
{
lateComings.Add(g); // IT MUST HAVE DATE TIME HERE NOT JUST DATE
}
countLates = lateComings.Count();
//list of time differences
var timeDiff = new List<TimeSpan>();
foreach (DateTime ts in lateComings)
{
if (ts.TimeOfDay > TimeSpan.FromHours(AT))
{
timeDiff.Add(ts.TimeOfDay - TimeSpan.FromHours(AT));
}
}
//fetching the minutes from the above list
var minutesList = timeDiff.Select(t => Convert.ToInt32(t.TotalMinutes)).ToList();
上述代码的作用是它不排除weekendDates，即此部分提供完整列表，包括weekendDates，即lateDateTimeList中的列表
IEnumerable<DateTime> lateDateTimeWithoutWeekendsList = lateDateTimeList.Except(weekendDates).ToList();
输出：
11/2/2017 10:53:00 AM
11/3/2017 11:10:03 AM
11/4/2017 01:12:13 PM
11/5/2017 12:11:10 PM
但如果我改变了;
IEnumerable<DateTime> lateDateTimeList = late.Select(m => m.DateTime.Value).ToList();
到
IEnumerable<DateTime> lateDateTimeList = late.Select(m => m.Date.Value).ToList();
它给了我所有日期，没有时间。
输出：
11/2/2017 12:00:00 AM
11/3/2017 12:00:00 AM
答案 0 :(得分：1)
怎么样：
static void Main(string[] args)
{
Thread.CurrentThread.CurrentCulture = new System.Globalization.CultureInfo("en-US");
List<DateTime> dates = new List<DateTime>();
for(int i = 1; i <= 50; i++)
{
DateTime date = DateTime.Now.AddDays(i);
dates.Add(date);
Trace.WriteLine(date.ToString("dd.MM.yyyy HH:mm:ss dddd"));
}
List<DateTime> filteredDates = dates.Where(date =>
!(date.DayOfWeek == DayOfWeek.Saturday ||
date.DayOfWeek == DayOfWeek.Sunday))
.ToList();
Trace.WriteLine("------NO-WEEKENDS----------");
filteredDates.ForEach(date => Trace.WriteLine(date.ToString("dd.MM.yyyy HH:mm:ss dddd")));
Console.ReadKey();
}
使用Linq Enumerable.Where
输出：
07.12.2017 08:40:32 Thursday
08.12.2017 08:40:32 Friday
09.12.2017 08:40:32 Saturday
10.12.2017 08:40:32 Sunday
11.12.2017 08:40:32 Monday
12.12.2017 08:40:32 Tuesday
13.12.2017 08:40:32 Wednesday
14.12.2017 08:40:32 Thursday
15.12.2017 08:40:32 Friday
16.12.2017 08:40:32 Saturday
17.12.2017 08:40:32 Sunday
18.12.2017 08:40:32 Monday
19.12.2017 08:40:32 Tuesday
20.12.2017 08:40:32 Wednesday
21.12.2017 08:40:32 Thursday
22.12.2017 08:40:32 Friday
23.12.2017 08:40:32 Saturday
24.12.2017 08:40:32 Sunday
25.12.2017 08:40:32 Monday
26.12.2017 08:40:32 Tuesday
27.12.2017 08:40:32 Wednesday
28.12.2017 08:40:32 Thursday
29.12.2017 08:40:32 Friday
30.12.2017 08:40:32 Saturday
31.12.2017 08:40:32 Sunday
01.01.2018 08:40:32 Monday
02.01.2018 08:40:32 Tuesday
03.01.2018 08:40:32 Wednesday
04.01.2018 08:40:32 Thursday
05.01.2018 08:40:32 Friday
06.01.2018 08:40:32 Saturday
07.01.2018 08:40:32 Sunday
08.01.2018 08:40:32 Monday
09.01.2018 08:40:32 Tuesday
10.01.2018 08:40:32 Wednesday
11.01.2018 08:40:32 Thursday
12.01.2018 08:40:32 Friday
13.01.2018 08:40:32 Saturday
14.01.2018 08:40:32 Sunday
15.01.2018 08:40:32 Monday
16.01.2018 08:40:32 Tuesday
17.01.2018 08:40:32 Wednesday
18.01.2018 08:40:32 Thursday
19.01.2018 08:40:32 Friday
20.01.2018 08:40:32 Saturday
21.01.2018 08:40:32 Sunday
22.01.2018 08:40:32 Monday
23.01.2018 08:40:32 Tuesday
24.01.2018 08:40:32 Wednesday
25.01.2018 08:40:32 Thursday
------NO-WEEKENDS----------
07.12.2017 08:40:32 Thursday
08.12.2017 08:40:32 Friday
11.12.2017 08:40:32 Monday
12.12.2017 08:40:32 Tuesday
13.12.2017 08:40:32 Wednesday
14.12.2017 08:40:32 Thursday
15.12.2017 08:40:32 Friday
18.12.2017 08:40:32 Monday
19.12.2017 08:40:32 Tuesday
20.12.2017 08:40:32 Wednesday
21.12.2017 08:40:32 Thursday
22.12.2017 08:40:32 Friday
25.12.2017 08:40:32 Monday
26.12.2017 08:40:32 Tuesday
27.12.2017 08:40:32 Wednesday
28.12.2017 08:40:32 Thursday
29.12.2017 08:40:32 Friday
01.01.2018 08:40:32 Monday
02.01.2018 08:40:32 Tuesday
03.01.2018 08:40:32 Wednesday
04.01.2018 08:40:32 Thursday
05.01.2018 08:40:32 Friday
08.01.2018 08:40:32 Monday
09.01.2018 08:40:32 Tuesday
10.01.2018 08:40:32 Wednesday
11.01.2018 08:40:32 Thursday
12.01.2018 08:40:32 Friday
15.01.2018 08:40:32 Monday
16.01.2018 08:40:32 Tuesday
17.01.2018 08:40:32 Wednesday
18.01.2018 08:40:32 Thursday
19.01.2018 08:40:32 Friday
22.01.2018 08:40:32 Monday
23.01.2018 08:40:32 Tuesday
24.01.2018 08:40:32 Wednesday
25.01.2018 08:40:32 Thursday
答案 1 :(得分：0)
using System;
using System.Collections.Generic;
using System.Linq;
static class DateTimeExtension
{
public static bool IsWeekend (this DateTime dt)
=> dt.DayOfWeek == DayOfWeek.Saturday || dt.DayOfWeek == DayOfWeek.Sunday;
public static Func<DateTime, bool> IsWeekend_2 =
dt => dt.DayOfWeek == DayOfWeek.Saturday || dt.DayOfWeek == DayOfWeek.Sunday;
}
class Program
{
Func<DateTime, bool> IsWeekend = dt => dt.DayOfWeek == DayOfWeek.Saturday || dt.DayOfWeek == DayOfWeek.Sunday;
static void PrintDates (IList<DateTime> dts) => Console.WriteLine (string.Join ("", dts.Select (item => item.ToString () + " Weekend: " + (item.IsWeekend () ? "Yes" : "No") + "\n"))) ;
static Random r = new Random ();
static void Main (string[] args)
{
// Data
var dates = new List<DateTime> ();
Enumerable.Range (0, 50)
.ToList ()
.ForEach (n => dates.Add (DateTime.Now.AddDays (n).AddHours(r.NextDouble() * 12)));
// no weekends
var datesWithoutWeekends = dates.Where (myDate => !myDate.IsWeekend ()).ToList ();
// also no weekends
var datesWithoutWeekends_2 = dates.Where (myDate => !DateTimeExtension.IsWeekend_2 (myDate)).ToList ();
// still no weekends
var datesWithoutWeekends_3 = dates.Where (myDate =>myDate.DayOfWeek != DayOfWeek.Sunday && myDate.DayOfWeek == DayOfWeek.Saturday).ToList ();
PrintDates (dates);
Console.WriteLine ();
PrintDates (datesWithoutWeekends);
Console.ReadLine ();
}
}
只需轻松过滤周末 - f.e.使用扩展 - 或谓词（不使用Predicase，使用Func - 它们是相同的，但Func是func'ier）或内联。
格式化输出输出（德语默认语言环境dd.mm.YYYY）：
06.12.2017 16:40:13 Weekend: No
07.12.2017 15:06:42 Weekend: No
08.12.2017 12:09:55 Weekend: No
09.12.2017 10:19:20 Weekend: Yes
10.12.2017 19:51:28 Weekend: Yes
11.12.2017 12:18:26 Weekend: No
15.12.2017 17:11:18 Weekend: No
16.12.2017 15:45:32 Weekend: Yes
17.12.2017 11:39:25 Weekend: Yes
18.12.2017 17:34:05 Weekend: No
19.12.2017 16:25:51 Weekend: No
20.12.2017 12:11:49 Weekend: No
21.12.2017 16:37:07 Weekend: No
22.12.2017 17:56:36 Weekend: No
23.12.2017 08:37:13 Weekend: Yes
24.12.2017 09:22:52 Weekend: Yes
25.12.2017 20:01:19 Weekend: No
26.12.2017 13:24:30 Weekend: No
06.12.2017 16:40:13 Weekend: No
07.12.2017 15:06:42 Weekend: No
08.12.2017 12:09:55 Weekend: No
11.12.2017 12:18:26 Weekend: No
12.12.2017 20:00:09 Weekend: No
13.12.2017 20:12:48 Weekend: No
14.12.2017 17:03:31 Weekend: No
15.12.2017 17:11:18 Weekend: No
18.12.2017 17:34:05 Weekend: No
19.12.2017 16:25:51 Weekend: No
20.12.2017 12:11:49 Weekend: No
21.12.2017 16:37:07 Weekend: No
22.12.2017 17:56:36 Weekend: No
25.12.2017 20:01:19 Weekend: No
26.12.2017 13:24:30 Weekend: No