File.Delete(url);
StreamWriter sw = new StreamWriter(url, true, Encoding.GetEncoding("utf-8"));
        sw.Write(vhtml);为什么这样写,无法写进内容了?File.Create(url);
StreamWriter sw = new StreamWriter(url, true, Encoding.GetEncoding("utf-8"));
        sw.Write(vhtml);
为什么这样写,无法写进内容了?