C#. Do if( a == (b or c or d)). Is it possible?

Question

Is there another way to write something like this:

if (a == x || a == y || a == z) 

One way that I found is doing it like this:

if( new [] {x,y,z}.Contains(a)) 

Are there other good ways?

Answer 1

I often use an extension method that mimics SQLs IN:

public static bool IsIn<T>(this T obj, params T[] collection) {    return collection.Contains(obj); } 

That way I can do

if(a.IsIn(b, c, d)) { ... }