How to check if a string contains invalid filename characters in c#?

Question

I have a string and I want to check if it contains any invalid filename characters. I know I could use

 Path.GetInvalidFileNameChars 

to get a array of invalid filename characters and loop through to see if the string contains any invalid char. But is there a easier and shorter expression? It is c#. So can anyone help?

Answer 1

bool containsInValidFilenameCharacters(string str) {
    return str.Any(Path.GetInvalidFileNameChars().Contains)
}

Note that this is the same as doing

var invalidChars = Path.GetInvalidFileNameChars();
return str.Any(c => invalidChars.Contains(c));

But since the type signature of Contains matches up exactly with the parameter delegate type of Any we can just pass it directly and it will do an implicit conversion.