C# Convert a Base64 -> byte[]

Question

I have a Base64 byte[] array which is transferred from a stream which i need to convert it to a normal byte[] how to do this ?

Answer 1

You have to use Convert.FromBase64String to turn a Base64 encoded string into a byte[].

Answer 2

This may be helpful

byte[] bytes = System.Convert.FromBase64String(stringInBase64);

Answer 3

Try

byte[] incomingByteArray = receive...; // This is your Base64-encoded bute[]

byte[] decodedByteArray =Convert.FromBase64String (Encoding.ASCII.GetString (incomingByteArray)); 
// This work because all Base64-encoding is done with pure ASCII characters

Answer 4

You're looking for the FromBase64Transform class, used with the CryptoStream class.

If you have a string, you can also call Convert.FromBase64String.

Answer 5

I've written an extension method for this purpose:

public static byte[] FromBase64Bytes(this byte[] base64Bytes)
{
    string base64String = Encoding.UTF8.GetString(base64Bytes, 0, base64Bytes.Length);
    return Convert.FromBase64String(base64String);
}

Call it like this:

byte[] base64Bytes = .......
byte[] regularBytes = base64Bytes.FromBase64Bytes();

I hope it helps someone.