前段时间做RSS阅读器，在获取某些博客时出现了编码问题，比如网易博客。
网易博客的RSS，通过跟踪调试发现其编码 CharacterSet = "ISO-8859-1" 因此利用传统的简单转换方式，无法将其转换为默认编码（UTF-8或GB2312/GBK），在多次试验以后发现利用下面的方法可以转换其编码格式：
Code
1
private void TestDecodeISO88591(string RssUrl)
2
{
3
string sResult = "";
4 System.IO.Stream ResponseStream =null;
5 HttpWebResponse hwrp = null;
6 System.IO.StreamReader oStreamReader =null;
7 Encoding UrlEncoding;
8 System.Net.HttpWebRequest hwr = (HttpWebRequest)HttpWebRequest.Create(RssUrl);
9 hwr.Method = "GET";
10 hwrp = (HttpWebResponse)hwr.GetResponse();
11 UrlEncoding = Encoding.GetEncoding(hwrp.CharacterSet);
12 ResponseStream = hwrp.GetResponseStream();
13 oStreamReader = new System.IO.StreamReader(ResponseStream, UrlEncoding);
14 sResult = oStreamReader.ReadToEnd();
15 if(hwrp.CharacterSet == "ISO-8859-1") //如果编码为ISO-8859-1才转换
16
{
17 sResult = ConvertISO88591ToEncoding(sResult, Encoding.Default);
18
}
19 hwrp.Close();
20 //处理RSS返回的数据
21 //.
22
}
23
24//转换
25private static string ConvertISO88591ToEncoding(string srcString, Encoding dstEncode)
26{
27 String sResult;
28 Encoding ISO88591Encoding = Encoding.GetEncoding("ISO-8859-1");
29 Encoding GB2312Encoding = Encoding.GetEncoding("GB2312"); //这个地方很特殊，必须利用GB2312编码
30 byte[] srcBytes = ISO88591Encoding.GetBytes(srcString);
31 //将原本存储ISO-8859-1的字节数组当成GB2312转换成目标编码(关键步骤)
32 byte[] dstBytes = Encoding.Convert(GB2312Encoding, dstEncode, srcBytes);
33 char[] dstChars = new char[dstEncode.GetCharCount(dstBytes, 0, dstBytes.Length)];
34 dstEncode.GetChars(dstBytes, 0, dstBytes.Length, dstChars, 0);//利用char数组存储字符
35 sResult = new string(dstChars);
36 return sResult;
37}
38
