Unicode有四种编码格式，UTF-8, UTF-16,UTF-32,UTF-7。

字符编码类,ASCIIEncoding ,UTF7Encoding,UnicodeEncoding,UTF32Encoding。

复制代码 代码如下:
using System.Collections.Generic;
using System.Text;

namespace AsciiEncodingDemo
{
class Program
{
static void Main(string[] args)
{
ASCIIEncoding myAscii = new ASCIIEncoding();
string unicodeStr = "ASCII Encoding Demo";
Console.WriteLine(unicodeStr);
//下面的代码将对unicodeStr字符串的内容进行编码。
Byte[] encodeBytes = myAscii.GetBytes(unicodeStr);
Console.WriteLine("编码后的字符串：");
foreach (byte c in encodeBytes)
{
Console.Write("[{0}]", c);
}
Console.WriteLine("");
Console.WriteLine("解码后的字符串：");
//下面的语句将对encodeBytes字节数组的内容进行解码
string decodeStr = myAscii.GetString(encodeBytes);
Console.WriteLine(decodeStr);
Console.ReadLine();
}
}
}