Calculate the number of weekdays between two dates in C#

Question

How can I get the number of weekdays between two given dates without just iterating through the dates between and counting the weekdays?

Seems fairly straightforward

Answer 1

I needed positive / negatives (not absolute values) so here's how I solved it:

    public static int WeekdayDifference(DateTime StartDate, DateTime EndDate)
    {
        DateTime thisDate = StartDate;
        int weekDays = 0;
        while (thisDate != EndDate)
        {
            if (thisDate.DayOfWeek != DayOfWeek.Saturday && thisDate.DayOfWeek != DayOfWeek.Sunday) { weekDays++; }
            if (EndDate > StartDate) { thisDate = thisDate.AddDays(1); } else { thisDate = thisDate.AddDays(-1); }
        }

        /* Determine if value is positive or negative */
        if (EndDate > StartDate) {
            return weekDays;
        }
        else
        {
            return weekDays * -1;
        }
    }