我实在是没招了，向高手请教关于base64解码的问题！！

Question

try
 Encoding.GetEncoding("GB2312").GetString(Convert.FromBase64String(base64String));
or
 Encoding.GetEncoding("utf-8").GetString(Convert.FromBase64String(base64String));

Answer 1

参考如下：
http://www.c-sharpcorner.com/Code/2003/July/SMTPInternationalization.asp

Answer 2

我只想知道，有谁能将下面的base64编码还原出来：
=?GB2312?B?UmU6ILPM1MbXo8Tj1tnH770=?==?GB2312?B?2r/swNajoQ==?=

Answer 3

/*Base64 解码*/                                                            
private string deCodeB64(string strSrc)                                    
{                                                                          
try                                                                
{                                                                  
if(strSrc!="")                                             
{                                                          
byte[] by=Convert.FromBase64String(strSrc);        
strSrc=Encoding.Default.GetString(by);             
}                                                          
}                                                                  
catch(Exception ex)                                                
{return ex.ToString();}                                            
return strSrc;                                                     
}

Answer 4

To:szwebnet(动力)兄弟：我用你的方法解编出来的字符串是：
前一段："Re: 程云祝你仲秋"
后一段："诳炖郑"原文应该是："Re: 程云祝你仲秋节快乐！"这到底是怎么回事呢？