C＃实现Base64编码与解码

[转]

图片：

 1             //编码例子
 2             System.IO.FileStream fs = System.IO.File.OpenRead("c://1.jpg");
 3             byte[] dt = new byte[fs.Length];
 4             fs.Read(dt, 0, (int)fs.Length);
 5             fs.Close();
 6             string s = Convert.ToBase64String(dt);
 7             fs = System.IO.File.OpenWrite("c://1.b64");
 8             dt = Encoding.Default.GetBytes(s);
 9             fs.Write(dt, 0, dt.Length);
10             fs.Flush();
11             fs.Close();
12             //解码例子
13             System.IO.FileStream fs = System.IO.File.OpenRead("c://1.b64");
14             byte[] dt = new byte[fs.Length];
15             fs.Read(dt, 0, (int)fs.Length);
16             string s = Encoding.Default.GetString(dt);
17             dt = Convert.FromBase64String(s);
18             fs = System.IO.File.OpenWrite("c://2.jpg");
19             fs.Write(dt, 0, dt.Length);
20             fs.Close();

文字：

编码：

byte[] bytes=Encoding.Default.GetBytes("要转换的字符串");

Convert.ToBase64String(bytes);

解码：

//"ztKwrsTj"是“我爱你”的base64编码

byte[] outputb = Convert.FromBase64String("ztKwrsTj");

string orgStr= Encoding.Default.GetString(outputb);