Hex representations for byte arrays and ints

"4A 4F 55 4E 49 20 48 45 49 4B 4E 49 45 4D 49"? Today, among other things, I wrote a C# method that converts byte arrays to their hex representations. That's very simple actually – ToString does most of the grunt work, but some parameterizations help in customizing things.

public static string ToHexString(
byte[] bytes, bool spacesBetweenBytes, bool upperCase) {
StringBuilder sb =
new StringBuilder(bytes.Length*(spacesBetweenBytes ? 3 : 2));
string byteFormat =
"{0:" + (upperCase ? 'X' : 'x') + "2}" + (spacesBetweenBytes ? " " : "");
foreach (Byte b in bytes)
sb.AppendFormat(byteFormat, b);
// Cut off the last space if we were using spacesBetweenBytes
if (spacesBetweenBytes && bytes.Length > 0)
return sb.ToString();

If the bytes parameter is an array of bytes 123 and 234, the hex representations by the combinations of the two boolean params are as follows:

w/ {123, 234}
upperCase false 7bea 7b ea
upperCase true 7BEA 7B EA

I believe you have no trouble guessing what this overload does:

public static string ToHexString(int num, bool spacesBetweenBytes, bool upperCase) {
return ToHexString(

Update 2004-11-21 9:00 UTC+2: I made the int version use BitConverter instead of implicitly setting the byte order (endianness). Sorry about the edit; I must've been asleep when writing the entry.

November 20, 2004 · Jouni Heikniemi · 2 Comments
Posted in: .NET

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