这会做您想要的。转换为VB.NET应该很容易，但是对于我来说已经太久了。

DateTime start = DateTime.Now;
DateTime end = start.AddDays(9);
IEnumerable<DateTime> holidays = new DateTime[0];

// basic data
int days = (int)(end - start).TotalDays;
int weeks = days / 7;

// check for a weekend in a partial week from start.
if (7- (days % 7) <= (int)start.DayOfWeek)
    days--;
if (7- (days % 7) <= (int)start.DayOfWeek)
    days--;

// lose the weekends
days -= weeks * 2;

foreach (DateTime dt in holidays)
{
    if (dt > start && dt < end)
        days--;
}