问C#通过考虑BusinessDays将TimeSpan添加到DateTime

EN

public DateTime AddBusinessDays(List<DateTime> businessDays, DateTime startDate, TimeSpan span)
{
    // Add the initial timespan
    DateTime endDate = startDate.Add(span);

    // Calculate the number of holidays by taking off the number of business days during the period
    int noOfHolidays = span.Days - businessDays.Where(d => d >= startDate && d <= endDate).Count();

    // Add the no. of holidays found
    endDate.AddDays(noOfHolidays);

    // Skip the end date if it lands on a holiday
    while (businessDays.Contains(endDate))
        endDate = endDate.AddDays(1);

    return endDate;
}

Add Timespan to date (DateIn,timespan)
    finalDateTime = (fromDate + timespan)

    fromDate = DateIn.date  
    toDate = finalDateTime.date 

    repeat 
        iDays = GetHolidaysBetween (fromDate, toDate) 
        finalDateTime = (finalDateTime + iDays) 

        fromDate = (toDate+1)   
        toDate = (toDate+iDays) 
    until (iDays=0)

    return finalDateTime
end_function