正则获取页面编码 判断当前页面的编码

//根据指定网址判断当前页面的编码
static public string GetWebpageCode(string url)
{
string charSet = "";

WebClient myWebClient = new WebClient();

myWebClient.Credentials = CredentialCache.DefaultCredentials;

//从资源下载数据并返回字节数组。（加@是因为网址中间有"/"符号）
byte[] myDataBuffer = myWebClient.DownloadData(url);
string strWebData = Encoding.Default.GetString(myDataBuffer);

//获取网页字符编码描述信息
Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)\"", RegexOptions.IgnoreCase | RegexOptions.Multiline);
string webCharSet = charSetMatch.Groups[2].Value;
if (charSet == null || charSet == "")
charSet = webCharSet;

return charSet;

}