将字符串 按照规定编码方式编码

1、ASCII 码

byte[] postBytes = Encoding.ASCII.GetBytes(param);

2、UTF-8 编码

 StreamReader reader = new StreamReader(receiveStream, Encoding.UTF8); 

3、GB2312编码

 Encoding myEncoding = Encoding.GetEncoding("gb2312");

 StreamReader reader = new StreamReader(receiveStream, myEncoding); 

 StreamReader reader = new StreamReader(receiveStream, Encoding.Default);

 StreamReader reader = new StreamReader(receiveStream, Encoding.UTF8);  

将字符串 按照规定编码方式编码

原文：http://www.cnblogs.com/gongyu/p/3981893.html