Why string.IsNullOrWhiteSpace(“\0”) is false

Question

I faced a problem where invisible character \\0 which is pretty like a \'white space\' not considered as white space by the string.IsNullOrWhiteSpace method. I

Answer 1

For fun historical reasons (they are surely fun, but I wasn't able to find them), null has two meanings... The null pointer/reference (called NULL in C), and the NUL (or NULL) \0 character.

String.IsNullOrWhiteSpace does:

Indicates whether a specified string is null, empty, or consists only of white-space characters.

with null meaning the "null reference", empty meaning empty and white-space meaning

White-space characters are defined by the Unicode standard. The IsNullOrWhiteSpace method interprets any character that returns a value of true when it is passed to the Char.IsWhiteSpace method as a white-space character.

The list of characters that Char.IsWhiteSpace considers a space is present in the page of Char.IsWhiteSpace.