Email中Quoted Printable的解码方法

代码

public   static   string  QPDecode( string  content, string  encodingOption)
        {
            content  =  content.Replace( " =\r\n " ,  "" ); 

              char [] chars  =  content.ToCharArray(); 
 
              byte [] bytes  =   new   byte [chars.Length]; 
 
              int  bytesCount  =   0 ; 
 
              for  ( int  i  =   0 ; i  <  chars.Length; i ++ ) 
             { 
 
                  if  (chars[i]  ==   ' = ' ) 
                 { 
                     bytes[bytesCount ++ ]  =  System.Convert.ToByte( int .Parse(chars[i  +   1 ].ToString()  +  chars[i  +   2 ].ToString(), System.Globalization.NumberStyles.HexNumber)); 
 
                     i  +=   2 ; 
                 } 
                  else  
                 { 
                     bytes[bytesCount ++ ]  =  System.Convert.ToByte(chars[i]); 
                 } 
             } 
 
 
              return  System.Text.Encoding.GetEncoding(encodingOption).GetString(bytes,  0 , bytesCount);
        }