Is there String.Split() which takes StringComparison into account?

Question

In Best Practices for Using Strings in the .NET Framework we are encouraged to supply proper StringComparison whenever we are comparing strings. I agree with the point but I see that unlike other methods, String.Split() actually does not have overloads with comparison parameter.

Is there equivalent of String.Split() taking string comparisons somewhere in the framework or am I expected to write my own?

Answer 1

Is there equivalent of String.Split() taking string comparisons somewhere in the framework?

No. There is not. And frankly I don't think it makes a lot of sense. If you split a string on a special character, generally because another system supplied the original string to you, why would you want to split on X and x? Usually you don't want to, and .NET doesn't supply a method to help you with it.

Am I expected to write my own?

Well, you could use a little help. Here is a case insensitive splitter. It still needs some work, but you can use it as a starting point:

public static string[] Split(string s, params char[] delimeter)
{
    List<string> parts = new List<string>();

    int lastPartIndex = 0;
    for (int i = 0; i < s.Length; i++)
    {
        if (delimeter.Select(x => char.ToUpperInvariant(x)).Contains(char.ToUpperInvariant(s[i])))
        {
            parts.Add(s.Substring(lastPartIndex, i - lastPartIndex));

            lastPartIndex = i + 1;
        }
    }

    if (lastPartIndex < s.Length)
    {
        parts.Add(s.Substring(lastPartIndex, s.Length - lastPartIndex));
    }

    return parts.ToArray();
}