IsHex() ??

[Tremendo]

bool Char.IsHex(char c)

Is there any function like that?

Char.IsNumber() definitely does not work.

Thank you.

 

[ChrisM]

In message (e-mail address removed),
Tremendo <[email protected]> Proclaimed from the tallest tower:

:: bool Char.IsHex(char c)
::
:: Is there any function like that?
::
:: Char.IsNumber() definitely does not work.
::
:: Thank you.

Not aware of one, but it would be a pretty easy function to write...

 

[Tremendo]

In message (e-mail address removed),
Tremendo <[email protected]> Proclaimed from the tallest tower:

:: bool Char.IsHex(char c)
::
:: Is there any function like that?
::
:: Char.IsNumber() definitely does not work.
::
:: Thank you.

Not aware of one, but it would be a pretty easy function to write...

Sure, but I am amazed that, among the hundreds of functions that the framework includes, they forgot
to include one so useful as that.


BTW, is there anything shorter than this?

if (Char.IsDigit(c) || ((Char.ToLower(c) >='a') && (Char.ToLower(c) <='f')))
....


I mean, is there any function like this?
bool Char.InSet(char c,string set_of_case_insensitive_characters)

that I could call like this

if (Char.InSet(c,"0123456789ABCDEF"))
....

Thanks

 

[Fabrizio Romano]

private bool IsHex(char c) {
return Char.IsLetterOrDigit(c) && Char.ToLower(c)<='f';
}

this should work.
Cheers,
Fabrizio

 

[rossum]

bool Char.IsHex(char c)

Is there any function like that?

Char.IsNumber() definitely does not work.

Thank you.

bool System.Uri.IsHexDigit(char) would seem to be what you want.

rossum

 

[Luc E. Mistiaen]

Something like

if ("0123456789ABCDEF".IndexOf(c) >= 0)...

 

[JR]

if ("0123456789ABCDEFabcdef".IndexOf(c) >= 0)...

JR

 

[Luc E. Mistiaen]

if ("0123456789ABCDEF".IndexOf(char.ToUpper(c)) >= 0)

/LM

 

[JR]

1. It is in general better to use ToLower rather than ToUpper, because of
the German small letter sharp S (Eszett) which translates to double S in
uppercase.

2. Although these days cycles to not matter much, converting the character
to uppercase is an expensive operation, locale dependent, and in this simple
case I think it would be better to add the lowercase letters to the string.

JR

 

[Jon Skeet [C# MVP]]

1. It is in general better to use ToLower rather than ToUpper, because of
the German small letter sharp S (Eszett) which translates to double S in
uppercase.

2. Although these days cycles to not matter much, converting the character
to uppercase is an expensive operation, locale dependent, and in this simple
case I think it would be better to add the lowercase letters to the string.

Converting to lowercase is locale dependent as well. Personally I'd
just use

return (x >= '0' && x <= '9') ||
(x >= 'a' && x <= 'f') ||
(x >= 'A' && x <= 'F');

Simple and effective.