Convert string to byte array in C#

Here are examples of how to convert various string representations to byte arrays in C#:

Converting a String to its Equivalent Byte Array:

string input = "hello world";
byte[] byteArray = System.Text.Encoding.UTF8.GetBytes(input);

Convert a Base64 string to byte[]:

string base64String = "SGVsbG8gV29ybGQ=";
byte[] byteArray = Convert.FromBase64String(base64String);

How to convert a hexadecimal string to a byte array:

string hexString = "48656C6C6F20576F726C64";
byte[] byteArray = Enumerable.Range(0, hexString.Length)
                     .Where(x => x % 2 == 0)
                     .Select(x => Convert.ToByte(hexString.Substring(x, 2), 16))
                     .ToArray();

How to convert a binary string representation to a byte array:

string binaryString = "010101000110100001101001011100110010000001110100011010000110010101110011";
byte[] byteArray = Enumerable.Range(0, binaryString.Length / 8)
                     .Select(i => Convert.ToByte(binaryString.Substring(i * 8, 8), 2))
                     .ToArray();

How to convert utf8 string to utf8 byte array:

string input = "hello world";
byte[] byteArray = Encoding.UTF8.GetBytes(input);

How to convert a string array to a byte array:

string[] stringArray = new string[] { "hello", "world" };
byte[] byteArray = stringArray.SelectMany(str => Encoding.UTF8.GetBytes(str)).ToArray();

How to convert a List<string> to a byte[]:

List<string> stringList = new List<string> { "hello", "world" };
byte[] byteArray = stringList.SelectMany(str => Encoding.UTF8.GetBytes(str)).ToArray();

C# convert string to byte array example:

string inputString = "Hello";
byte[] byteArray = Encoding.ASCII.GetBytes(inputString);
// Result: [72, 101, 108, 108, 111]

C# string to byte array encoding:

string inputString = "ABCD";
byte[] byteArray = Encoding.Default.GetBytes(inputString);
// Result: [65, 66, 67, 68]

Encoding.GetBytes C# string to byte array:

string inputString = "abcd";
byte[] byteArray = Encoding.UTF8.GetBytes(inputString);
// Result: [97, 98, 99, 100]

Convert ASCII string to byte array in C#:

string inputString = "Hello";
byte[] byteArray = Encoding.ASCII.GetBytes(inputString);
// Result: [72, 101, 108, 108, 111]

UTF-8 encoding in C# for string to byte array:

string inputString = "Hello";
byte[] byteArray = Encoding.UTF8.GetBytes(inputString);
// Result: [72, 101, 108, 108, 111]

C# string to byte array conversion methods:

string inputString = "Hello";

// Method 1: Using Encoding.GetBytes
byte[] byteArray1 = Encoding.UTF8.GetBytes(inputString);

// Method 2: Using BitConverter
byte[] byteArray2 = BitConverter.GetBytes(inputString);

BitConverter.GetBytes C# string to byte array:

string inputString = "Hello";
byte[] byteArray = BitConverter.GetBytes(inputString);
// Result: [72, 0, 0, 0, 0, 101, 0, 0, 0, 0, 108, 0, 0, 0, 0, 108, 0, 0, 0, 0, 111, 0, 0, 0, 0]

C# convert hex string to byte array:

string hexString = "48656C6C6F"; // Hex representation of "Hello"
byte[] byteArray = Enumerable.Range(0, hexString.Length)
                              .Where(x => x % 2 == 0)
                              .Select(x => Convert.ToByte(hexString.Substring(x, 2), 16))
                              .ToArray();
// Result: [72, 101, 108, 108, 111]

Base64 string to byte array in C#:

string base64String = "SGVsbG8="; // Base64 encoding of "Hello"
byte[] byteArray = Convert.FromBase64String(base64String);
// Result: [72, 101, 108, 108, 111]

Unicode string to byte array C#:

string inputString = "Hello";
byte[] byteArray = Encoding.Unicode.GetBytes(inputString);
// Result: [72, 0, 101, 0, 108, 0, 108, 0, 111, 0]