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

Answer 1

Here is yet another alternative:

bool x = new[] { "1", "5", "9" }.Any(a => a == "5"); //x == true
bool y = new[] { "1", "5", "9" }.Any(a => a == "8"); //y == false

It is better to use .Contains(foo) in this case, as the flexibility of the lambda is rather wasted here. If there was a complex expression that needed to be done, Any would be more useful.

Answer 2

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).