How to Convert a byte[] Array to a Hex String in C#?

Converting C# byte[] Arrays to Hex Strings

Directly converting a byte[] array to a string in C# often yields undesirable results, typically displaying "System.Byte[]". This guide shows how to efficiently convert a byte array to its hexadecimal (hex) string representation, addressing common issues.

Method 1: Using BitConverter

The BitConverter class offers a simple solution:

<code class="language-csharp">byte[] data = { 1, 2, 4, 8, 16, 32 };
string hex = BitConverter.ToString(data); // Result: 01-02-04-08-10-20
string hexNoDashes = BitConverter.ToString(data).Replace("-", ""); // Result: 010204081020</code>

This method produces a hex string with or without hyphens separating the byte values.

Method 2: Using Base64 Encoding (Compact Representation)

For a more compact hexadecimal representation, consider Base64 encoding:

<code class="language-csharp">string base64 = Convert.ToBase64String(data); // Result (will vary): AQIECBAg</code>

Base64 encoding provides a shorter string representation, although it's not strictly a hexadecimal format. Choose this method if space efficiency is paramount. Note that the resulting string will not be directly interpretable as hexadecimal.

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