How do you pass multiple enum values in C#?

Question

Sometimes when reading others\' C# code I see a method that will accept multiple enum values in a single parameter. I always thought it was kind of neat, but never looked in

Answer 1

In my particular situation, I would like to use the System.DayOfWeek

You can not use the System.DayOfWeek as a [Flags] enumeration because you have no control over it. If you wish to have a method that accepts multiple DayOfWeek then you will have to use the params keyword

void SetDays(params DayOfWeek[] daysToSet)
{
    if (daysToSet == null || !daysToSet.Any())
        throw new ArgumentNullException("daysToSet");

    foreach (DayOfWeek day in daysToSet)
    {
        // if( day == DayOfWeek.Monday ) etc ....
    }
}

SetDays( DayOfWeek.Monday, DayOfWeek.Sunday );

Otherwise you can create your own [Flags] enumeration as outlined by numerous other responders and use bitwise comparisons.