C# Base 64 编码/解码实现代码

   string strPath = "aHR0cDovLzIwMy44MS4yOS40Njo1NTU3L1
 9iYWlkdS9yaW5ncy9taWRpLzIwMDA3MzgwLTE2Lm1pZA==";     
   byte[] bpath = Convert.FromBase64String(strPath);
   strPath = System.Text.ASCIIEncoding.Default.GetString(bpath);

System.Text.Encoding encode = System.Text.Encoding.ASCII ;
byte[] bytedata = encode.GetBytes( "test");
string strPath = Convert.ToBase64String(bytedata,0,bytedata.Length);