private async Task <Book> GetBookFromDangdang(string isbn)
{
var keywords = _configuration["Dangdang:TitleKeywords"];
Regex oldBookRegex = new Regex(keywords);
try
{
string dangdangSearchUrl = @"http://search.dangdang.com/?key={0}&act=input";
var url = string.Format(dangdangSearchUrl, isbn);
var htmlStr = await _htmlService.GetHtmlString(url, Encoding.GetEncoding(936), Encoding.Default);
var dom = await _parser.ParseAsync(htmlStr);
List <IHtmlListItemElement> links = new List <IHtmlListItemElement>();
_htmlService.FindAllHtmlElement(links, dom.Body);
var allLines = links.Where(c => !c.ClassName.IsNullOrEmpty() && c.ClassName.StartsWith("line"));
Book book = null;
foreach (var line in allLines)
{
if (!(line.Children[0] is IHtmlAnchorElement firstLink))
{
continue;
}
if (oldBookRegex.Match(firstLink.Title).Success)
{
continue;
}
var href = firstLink.Href;
var productId = _htmlService.GetNumber(href);
var bookDetailHtmlStr = await _htmlService.GetHtmlString(href, Encoding.GetEncoding(936), Encoding.Default);
if (!bookDetailHtmlStr.Contains(isbn))
{
continue;
}
book = await _bookAppService.SaveDangdangBookAsync(isbn, productId, bookDetailHtmlStr);
if (book != null)
{
break;
}
}
return(book);
}
catch (System.Exception ex)
{
Logger.Warn($"获取{isbn}的书籍信息时出现错误:{ex}");
return(null);
}
}