C#•2y ago

char.IsLetterOrDigit

does a whitespace count as letter or digit

7 Replies

jsOP•2y ago

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

MODiX•2y 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•2y 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.

Looks like neither of them

jsOP•2y ago

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

You could .Trim() i guess

char.IsWhiteSpace(' ')

char.IsWhiteSpace(' ')

Pobiega•2y 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.