.OrderBy(DayOfWeek) to treat Sunday as the end of the week

Question

I\'m ordering a number of objects by their System.DayOfWeek property.

DayOfWeek treats Sunday as the start of the week, whereas I would like it to be ordered so

Answer 1

I use a solution based on current culture:

// all days of week
var daysOfWeek = Enum.GetValues(typeof(DayOfWeek)).Cast();

// get first day of week from current culture
var firstDayOfWeek = CultureInfo.CurrentCulture.DateTimeFormat.FirstDayOfWeek;

// all days of week ordered from first day of week
var daysOfWeekOrdered = daysOfWeek.OrderBy(x => (x - firstDayOfWeek + 7) % 7);

The important part is the OrderBy lambda. It's basically a parametrized version of Jon's answer above.

This way it will be ordered from Monday in the UK, and from Sunday in the US.