Question

我读了一些与C＃中的功能相关的问题/答案来计算工作日（星期一到星期五的天数）;有些人使用扩展代码来实现这一目标。

我有一个包含超过50,000行的数据表，我需要一种有效的方法来计算这些信息。

Answer 1

根据@MiBols的回答，一个更有效的解决方案是使用HashSet<DateTime>而不是List<DateTime>，其中搜索位于O(1)：

/// <summary> Get working days between two dates (Excluding a list of dates - Holidays) </summary>
/// <param name="dtmCurrent">Current date time</param>
/// <param name="dtmFinishDate">Finish date time</param>
/// <param name="excludedDates">Collection of dates to exclude (Holidays)</param>
public static int fwGetWorkingDays(this DateTime dtmCurrent, DateTime dtmFinishDate, 
                                   HashSet<DateTime> excludedDates)
{
    Func<DateTime, bool> workDay = currentDate => (
        currentDate.DayOfWeek == DayOfWeek.Saturday ||
        currentDate.DayOfWeek == DayOfWeek.Sunday ||
        excludedDates.Contains(currentDate.Date));

    return Enumerable.Range(0, 1 + (dtmFinishDate - dtmCurrent).Days)
        .Count(intDay => workDay(dtmCurrent.AddDays(intDay)));
}

Answer 2

/// <summary> Get working days between two dates (Excluding a list of dates - Holidays) </summary>
/// <param name="dtmCurrent">Current date time</param>
/// <param name="dtmFinishDate">Finish date time</param>
/// <param name="lstExcludedDates">List of dates to exclude (Holidays)</param>
public static int fwGetWorkingDays(this DateTime dtmCurrent, DateTime dtmFinishDate, List<DateTime> lstExcludedDates)
{
    Func<DateTime, bool> workDay = currentDate =>
            (
                currentDate.DayOfWeek == DayOfWeek.Saturday ||
                currentDate.DayOfWeek == DayOfWeek.Sunday ||
                lstExcludedDates.Exists(evalDate => evalDate.Date.Equals(currentDate.Date))
            );

    return Enumerable.Range(0, 1 + (dtmFinishDate - dtmCurrent).Days).Count(intDay => workDay(dtmCurrent.AddDays(intDay)));
}

我创建了这个扩展，基本上需要两个日期和一个要排除的日期列表（假期）。令人惊讶的是，这种方法非常快，并且在与排除列表进行比较时进行了验证，以排除DateTime的时间。

Answer 3

git rm --cached -r * -f

Answer 4

我在上面混合了两个部分，将表达式反转以验证workDay并检查差异是否为负。

public static int GetWorkingDaysUntil(this DateTime dtmCurrent, DateTime dtmFinishDate, HashSet<DateTime> excludedDates)
{
    Func<DateTime, bool> workDay = currentDate => !(currentDate.DayOfWeek == DayOfWeek.Saturday ||
                                                    currentDate.DayOfWeek == DayOfWeek.Sunday ||
                                                    excludedDates.Contains(currentDate.Date));

    var daysDifference = (dtmFinishDate - dtmCurrent).Days;

    return daysDifference > 0 ?
                Enumerable.Range(0, 1 + daysDifference).Count(intDay => workDay(dtmCurrent.AddDays(intDay))) :
                0;
}

C＃如何计算不包括特定日期的工作日（假期）

4 个答案: