数组Byte [] 和 string 相互转换

using System;
using System.Collections.Generic;
using System.Text;

namespace NET.MST.Fourth.StringByte
{
    class StringByte
    {
        static void Main(string[] args)
        {
            String s = "我是字符串,I am string";

            //字节数组转换到字符串
            Byte[] utf8 = StringToByte(s, 
                Encoding.UTF8);
            Byte[] gb2312 = StringToByte(s, 
                Encoding.GetEncoding("GB2312"));
            Byte[] unicode = StringToByte(s, 
                Encoding.Unicode);
            Console.WriteLine(utf8.Length);
            Console.WriteLine(gb2312.Length);
            Console.WriteLine(unicode.Length);

            //转换回字符串
            Console.WriteLine(ByteToString(utf8, 
                Encoding.UTF8));
            Console.WriteLine(ByteToString(gb2312, 
                Encoding.GetEncoding("GB2312")));
            Console.WriteLine(ByteToString(unicode,
                Encoding.Unicode));
            Console.Read();
        }
        static Byte[] StringToByte(String s, Encoding encoding)
        {
            return encoding.GetBytes(s);
        }
        static String ByteToString(Byte[] b, Encoding encoding)
        {
            return encoding.GetString(b);
        }
    }
}