private SerialPreviewViewModel[] GetSerials(params IHtmlCollection<IElement>[] dataElements)
{
    // Обрабока коллекций циклом
    return new SerialPreviewViewModel[] { };
}

public async Task<IPageModel> LoadPageAsync(Uri pageUrl)
{
    IDocument document = await LoadStreamAsync(pageUrl);
    IElement content = document.QuerySelector("div#dle-content");
    IPaginatorModel paginator = GetPaginator(content.QuerySelector("div.navi"));

    IHtmlCollection<IElement> postContentTitles = content.QuerySelectorAll("div.newstitle");
    IHtmlCollection<IElement> postContentInfo = content.QuerySelectorAll("div.newsinfo");
    IHtmlCollection<IElement> postContentShort = content.QuerySelectorAll("div.news_short");

    PageModel result = new PageModel
    (
        new TaskCommand(async () => await LoadPageAsync(pageUrl)),
        paginator,
        GetSerials(postContentTitles, postContentInfo, postContentShort)
    );

    return await Task.FromResult(result);
}

private static IPaginatorModel GetPaginator(IParentNode element)
{
    IHtmlCollection<IElement> paginatorData = element.QuerySelectorAll(".navigation > *");
    int[] paginatorPagesList = new int[paginatorData.Length];

    for (int i = 0; i < paginatorData.Length; i++)
    {
        IElement currentElement = paginatorData[i];

        paginatorPagesList[i] = currentElement.TagName == "A"
            ? int.Parse(paginatorData[i].Text())
            : currentElement.TagName == "SPAN" && currentElement.ClassName == "nav_ext"
                ? 0
                : -int.Parse(paginatorData[i].Text());
    }

    return new PaginatorModel(Math.Abs(paginatorPagesList.First(i => Math.Abs(i) > 0)),
        paginatorPagesList.Select(Math.Abs).ToArray());
}

div.newstitle, newsinfo, div.news_short

var result = new
            {
                postContentTitles = content.QuerySelectorAll("div.newstitle"),
                ostContentInfo = content.QuerySelectorAll("div.newsinfo"),
                postContentShort = content.QuerySelectorAll("div.news_short")
            };