C#•7mo ago

char.IsLetterOrDigit

does a whitespace count as letter or digit

7 Replies

jsOP•7mo ago

im trying to write a statement to check if a string contains only alphanumeric characters an example would be Fast Food Emporium

MODiX•7mo ago

Servator

REPL Result: Success

char.IsLetter(' ')

char.IsLetter(' ')

Result: bool

False

False

Compile: 247.642ms | Execution: 17.679ms | React with ❌ to remove this embed.

MODiX•7mo ago

Servator

REPL Result: Success

char.IsDigit(' ')

char.IsDigit(' ')

Result: bool

False

False

Compile: 291.154ms | Execution: 17.143ms | React with ❌ to remove this embed.

Servator•7mo ago

Looks like neither of them

jsOP•7mo ago

if ((nameCheck.Any(char.IsLetterOrDigit) == false) || (nameCheck.Length > 5)) thats what ive got but spaces are flagging it as false for valid names

Servator•7mo ago

You could .Trim() i guess

char.IsWhiteSpace(' ')

char.IsWhiteSpace(' ')

Pobiega•7mo ago

So your validation isn't just alphanumeric, its alphanumeric and spaces. so write your own helper method for that. Something like

public static bool IsAlphaNumericOrWhitespace(this char c) => char.IsLetterOrDigit(c) || char.IsWhiteSpace(c);

public static bool IsAlphaNumericOrWhitespace(this char c) => char.IsLetterOrDigit(c) || char.IsWhiteSpace(c);

should work, but you might want to restrict it to just spaces instead of any whitespace.