System.String.Split(null) doesn't remove whitespace (C#)

Question

I know that System.String.Split(null) should return me a string array with whitespace removed. I\'ve read this post and this MSDN doc, which does not agree with

Answer 1

I suspect the problem is you're confusing an empty string with a space. Let me demonstrate:

    static void Main(string[] args)
    {
        var info = "628      5911.3097      1660.0134      3771.8285              0";
        Console.WriteLine(info);
        //foreach (var c in info)
        //    Console.WriteLine(Char.IsWhiteSpace(c));

        Console.WriteLine();

        string[] split = info.Split();
        foreach (string s in split)
            Console.WriteLine("\"" + s + "\" is empty: " + (s.Length == 0));

        //What happens if we concat the strings?
        Console.WriteLine();
        Console.WriteLine(string.Concat(split));

        Console.ReadLine();

        /*
        628      5911.3097      1660.0134      3771.8285              0

        "628" is empty: False
        "" is empty: True
        "" is empty: True
        "" is empty: True
        "" is empty: True
        "" is empty: True
        "5911.3097" is empty: False
        "" is empty: True
        "" is empty: True
        "" is empty: True
        "" is empty: True
        "" is empty: True
        "1660.0134" is empty: False
        "" is empty: True
        "" is empty: True
        "" is empty: True
        "" is empty: True
        "" is empty: True
        "3771.8285" is empty: False
        "" is empty: True
        "" is empty: True
        "" is empty: True
        "" is empty: True
        "" is empty: True
        "" is empty: True
        "" is empty: True
        "" is empty: True
        "" is empty: True
        "" is empty: True
        "" is empty: True
        "" is empty: True
        "" is empty: True
        "0" is empty: False

        6285911.30971660.01343771.82850
        */
    }

In future may I suggest you using the following API call?

string[] split = info.Split((char[])null,StringSplitOptions.RemoveEmptyEntries);

Like so:

static void Main(string[] args)
{
    var info = "628      5911.3097      1660.0134      3771.8285              0";
    Console.WriteLine(info);
    Console.WriteLine();

    string[] split = info.Split((char[])null,StringSplitOptions.RemoveEmptyEntries);
    foreach (string s in split)
        Console.WriteLine("\"" + s + "\" is empty: " + (s.Length == 0));

    //What happens if we concat the strings?
    Console.WriteLine();
    Console.WriteLine(string.Concat(split));

    Console.ReadLine();

    /*
    628      5911.3097      1660.0134      3771.8285              0

    "628" is empty: False
    "5911.3097" is empty: False
    "1660.0134" is empty: False
    "3771.8285" is empty: False
    "0" is empty: False

    6285911.30971660.01343771.82850
    */
}