How to check if a string is doesn't equal all of these?

Question

Trying to rewrite this using LINQ:

if (mode != "A" && mode != "B" && mode != "C" && mode != "D" && mode != "E" && mode != "F" && mode != "G")
{
   continue;
}

What would be the most clear and concise way to refactor this? I could have sworn I'd seen a post like this before but I cannot find it at the moment.

Answer 1

You can use Contains method from IList<T>:

IList<string> modes = new[]{"A","B","C","D","E","F","G"};
if (!modes.Contains(mode))...

Answer 2

Write an extension method for the string class

public static bool In(this string s, params string[] values)
{
    return values.Any(x => x.Equals(s));
}

call it in this way

if (!mode.In("A", "B", "C", "D","E","F", "G")
{
    continue;
}