IEnumerable 除了不工作

Question

我有以下代码

/// <summary>
///     Calculates the date with a number of working days offset from today by
///     calculating a set of dates that exclude weekends and holidays, then
///     skipping forward the required number of days.
/// </summary>
public static DateTime AddWorkingDays(int workingDays, DateTime startDate)
{
    var workDaysQuery = from n in Enumerable.Range(0, (workingDays + 14) * 2)
                        let date = startDate.AddDays(n)
                        where (date.DayOfWeek != DayOfWeek.Sunday) && (date.DayOfWeek != DayOfWeek.Saturday)
                        select date;
    var publicHolidays = GetPublicHolidays();

    var daysWorking = workDaysQuery.Except(publicHolidays).ToArray(); // why does this still include the publicHolidays ?

    return daysWorking.Skip(workingDays).First();
}

但是 Except 不会删除 public 假期。

public 个假期日期的时间部分均为零。

Answer 1

试试这个：

public static DateTime AddWorkingDays(int workingDays, DateTime startDate)
{
    var workDaysQuery = from n in Enumerable.Range(0, (workingDays + 14) * 2)
                        let date = startDate.AddDays(n)
                        where (date.DayOfWeek != DayOfWeek.Sunday)
                        && (date.DayOfWeek != DayOfWeek.Saturday)
                        select date.Date; //Remove the time component

    //The following change is not needed if you know for sure that 
    //values returned by GetPublicHolidays() will not include a time component
    var publicHolidays = GetPublicHolidays().Select(x => x.Date);

    var daysWorking = workDaysQuery.Except(publicHolidays).ToArray(); 

    return daysWorking.Skip(workingDays).First();
}

基本上，如果两个 DateTime 值具有相同的日期（年月日）但时间分量不同，则系统会将它们视为 non-equal。

上面的代码所做的是它使用 Date 属性只获取日期部分（没有时间）。这样，相等性检查（由 Except 内部完成）将是正确的。

IEnumerable 除了不工作

IEnumerable Except not working

c#

ienumerable