Best way to specify whitespace in a String.Split operation

Question

If you just call:

string[] ssize = myStr.Split(null); //Or myStr.Split()

or:

string[] ssize = myStr.Split(new char[0]);

then white-space is assumed to be the splitting character. From the string.Split(char[]) method's documentation page.

If the separator parameter is null or contains no characters, white-space characters are assumed to be the delimiters. White-space characters are defined by the Unicode standard and return true if they are passed to the Char.IsWhiteSpace method.

Always, always, always read the documentation!

Yes, There is need for one more answer here!

All the solutions thus far address the rather limited domain of canonical input, to wit: a single whitespace character between elements (though tip of the hat to @cherno for at least mentioning the problem). But I submit that in all but the most obscure scenarios, splitting all of these should yield identical results:

string myStrA = "The quick brown fox jumps over the lazy dog";
string myStrB = "The  quick  brown  fox  jumps  over  the  lazy  dog";
string myStrC = "The quick brown fox      jumps over the lazy dog";
string myStrD = "   The quick brown fox jumps over the lazy dog";

String.Split (in any of the flavors shown throughout the other answers here) simply does not work well unless you attach the RemoveEmptyEntries option with either of these:

myStr.Split(new char[0], StringSplitOptions.RemoveEmptyEntries)
myStr.Split(new char[] {' ','\t'}, StringSplitOptions.RemoveEmptyEntries)

As the illustration reveals, omitting the option yields four different results (labeled A, B, C, and D) vs. the single result from all four inputs when you use RemoveEmptyEntries:

Of course, if you don't like using options, just use the regex alternative :-)

Regex.Split(myStr, @"\s+").Where(s => s != string.Empty)

According to the documentation :

If the separator parameter is null or contains no characters, white-space characters are assumed to be the delimiters. White-space characters are defined by the Unicode standard and return true if they are passed to the Char.IsWhiteSpace method.

So just call myStr.Split(); There's no need to pass in anything because separator is a params array.

Why dont you use?:

string[] ssizes = myStr.Split(' ', '\t');