public static string GetFlvUrl(uint cid)
{
string url = $"http://interface.bilibili.tv/playurl?appkey={appkey}&cid=";
string html = GetHtml(url + cid);
if (!html.Contains("<result>su"))
{
Log.Error("FLV地址获取失败！ - CID：" + cid);
return null;
}
byte[] byteArray = Encoding.UTF8.GetBytes(html);
MemoryStream stream = new MemoryStream(byteArray);
XElement xe = XElement.Load(stream);
var t = xe.Elements("url");
IEnumerable<string> elements = from ele in xe.Descendants("url") //where ele.Name == "url"
select ele.Value;
return elements.ToArray()[0];
}