c# 字符串转换为byte

using System.Text;
class proj
{internal static void Main(string[] args){byte[] a=new byte[3];Console.WriteLine("打印a");Console.WriteLine("a的长度{0}",a.Length);foreach (byte b in a){ Console.WriteLine(b); }a = Encoding.UTF8.GetBytes("我爱你");Console.WriteLine("给byte赋值");Console.WriteLine("a的长度{0}", a.Length);foreach (byte b in a){  Console.WriteLine(b); }string c;c=Encoding.UTF8.GetString(a,0,9);Console.WriteLine(c);}
}