把UTF8编码转换为GB2312编码[转]
如果只有某个页的编码需要修改，ASP.net 中则可以简单的使用下面代码：
Encoding gb2312 = Encoding.GetEncoding( " gb2312 " );
Response.ContentEncoding = gb2312;
在非ASP.net 应用中，可能你读到的数据是UTF-8编码，但是你要转换为GB2312编码，则可以参考以下代码：
string utfinfo = " document.write(\"alert('aa你好么？？');\"); " ;
string gb2312info = string .Empty;
Encoding utf8 = Encoding.UTF8;
Encoding gb2312 = Encoding.GetEncoding( " gb2312 " );
// Convert the string into a byte[]. byte [] unicodeBytes = utf8.GetBytes(utfinfo);
// Perform the conversion from one encoding to the other. byte [] asciiBytes = Encoding.Convert(utf8, gb2312, unicodeBytes);
// Convert the new byte[] into a char[] and then into a string.
// This is a slightly different approach to converting to illustrate
// the use of GetCharCount/GetChars. char [] asciiChars = new char [gb2312.GetCharCount(asciiBytes, 0 , asciiBytes.Length)];
gb2312.GetChars(asciiBytes, 0 , asciiBytes.Length, asciiChars, 0 );
gb2312info = new string (asciiChars);
当然，其他各种编码之间的转换，跟上述代码也类似的，就不描述了。
http://www.cnblogs.com/hesicong/archive/2005/08/17/217109.html
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