学步园

Encoding encoding_destination   = Encoding.UTF8;
            Encoding encoding_default       = Encoding.Default;

source_str = "俄罗斯";
            byte[] source_byte = encoding_destination.GetBytes(source_str);

            //byte[] source_byte = encoding_default.GetBytes(source_str);
            string test = encoding_destination.GetString(source_byte);
            //File.WriteAllBytes("2.txt", source_byte);
            File.WriteAllText("2.txt", test);

            Console.WriteLine(test);