How to combine || operators in condition statement [duplicate]

Question

Instead of

if (foo == "1" || foo == "5" || foo == "9" ... )  

I like to combine them similar to the following (which doesn't work):

if (foo == ("1" || "5" || "9" ... )) 

Is that possible?

Answer 1

Unfortunately not, your best bet is to create an extension method

public static bool IsOneOf<T>(this T value, params T[] options) {     return options.Contains(value); } 

and you can use it like this:

if (foo.IsOneOf("1", "5", "9")) {     ... } 

Being generic, it can be used for any type (int, string etc).