Shorthand conditional in C# similar to SQL 'in' keyword

Question

In C# is there a shorthand way to write this:

public static bool IsAllowed(int userID)
{
    return (userID == Personnel.JohnDoe || userID == Personnel.JaneD         


        

Answer 1

How about this?

public static class Extensions
{
    public static bool In(this T testValue, params T[] values)
    {
        return values.Contains(testValue);
    }
}

Usage:

Personnel userId = Personnel.JohnDoe;

if (userId.In(Personnel.JohnDoe, Personnel.JaneDoe))
{
    // Do something
}

I can't claim credit for this, but I also can't remember where I saw it. So, credit to you, anonymous Internet stranger.