Question

BASE64 解密算法给个....C#的..最好..

Answer 1

.Net中强大的Convert对象中不是有BASE64方法吗？
Convert.ToBase64String(myByte);
下面是一个实例，演示字符串转转base64和从base64转回字符串。

static void Main(string[] args)

{

string factString = "中华人民共和国";

byte[] myByte;

string Base64Str;

//先把字符串按照utf-8的编码转换成byte[]

Encoding myEncoding = Encoding.GetEncoding("utf-8");

//myByte中获得这样的字节数组：228,184,173,229,141,142,228,186,186,230,176,145,229,133,177,229,146,140,229,155,189

myByte = myEncoding.GetBytes(factString);

//把byte[]转成base64编码,这个例子形成的base64编码的unicode等价字符串为:"5Lit5Y2O5Lq65rCR5YWx5ZKM5Zu9"

Base64Str = Convert.ToBase64String(myByte);

//再从base64编码转成byte[]，又恢复为字节数组：228,184,173,229,141,142,228,186,186,230,176,145,229,133,177,229,146,140,229,155,189

myByte = Convert.FromBase64String(Base64Str);

//用同一个Encoding对象把byte[]转成字符串："中华人民共和国"

factString = myEncoding.GetString(myByte);

Console.WriteLine(factString);

}