C# Converting a string value to a byte

Question

I need a bit of help, How would I go about converting the below to a byte.

string s = "0x01";
byte b = Convert.toByte(s); //(Tried this) ??
byte c = byte.Parse(s); //(Tried this as well)

How would I convert s to a byte ?

The code isn't even valid. You can't assign 0x01 to a string. Fix it to the actual string you have. — Sami Kuhmonen
– Sami Kuhmonen, Commented Sep 14, 2016 at 13:06
Are you only going to convert strings on the format of 0x?? or do you need to support binary, octal, decimal as well? — Lasse V. Karlsen
– Lasse V. Karlsen, Commented Sep 14, 2016 at 13:23

Techidiot · Accepted Answer · 2016-09-14 13:29:51Z

4

I guess the parse function won't allow the prefix 0X in the string so you might use sub-string to remove it.

byte myByte = Byte.Parse(s.SubString(2), NumberStyles.HexNumber);

Or use -

byte myByte = Convert.ToByte(s,16);

edited Sep 14, 2016 at 13:29

answered Sep 14, 2016 at 13:11

Techidiot

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8 Comments

kiziu Over a year ago

Why convert first to int? ToByte also accepts radix.

Techidiot Over a year ago

Just another way.

kiziu Over a year ago

Sorry, I don't follow. Why add another unnecessary step? Convert.ToByte("0xef", 16) works correctly.

Matthew Watson Over a year ago

Kiziu is correct: You don't need to strip off the 0x and you don't need to convert to an int first.

Techidiot Over a year ago

Remove the second suggestion. Thanks.

|

Abhay · Accepted Answer · 2016-09-14 13:32:29Z

0

Firstly, remove "0x" from the string value and then use parse() method with NumberStyles.HexNumber

string s = "AA";
byte byteValue = 0; 
try
{
    byteValue = byte.Parse(s, NumberStyles.HexNumber | NumberStyles.AllowHexSpecifier);
}
catch (Exception e)
{
     Console.WriteLine(e);
}

Console.WriteLine("String value: 0x{0}, byte value: {1}", s, byteValue);

answered Sep 14, 2016 at 13:32

Abhay

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