How to Read an embedded resource as array of bytes without writing it to disk?

You are actually already reading the stream to a byte array, why not just stop there?

public static byte[] ExtractResource(String filename)
    System.Reflection.Assembly a = System.Reflection.Assembly.GetExecutingAssembly();
    using (Stream resFilestream = a.GetManifestResourceStream(filename))
        if (resFilestream == null) return null;
        byte[] ba = new byte[resFilestream.Length];
        resFilestream.Read(ba, 0, ba.Length);
        return ba;

edit: See comments for a preferable reading pattern.

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