class PdfTools{    /// <summary>    /// 源文件    /// </summary>    public string filepath { get; set; }    /// <summary>    ///     /// </summary>    private string filename {        get {            string _filename = Path.GetFileName(filepath);            _filename = _filename.Substring(0, _filename.IndexOf(‘.‘));            return _filename;        }    }    /// <summary>    /// 最终文件目标夹    /// </summary>    public string folder { get; set; }    public PdfTools() { }    public PdfTools(string _filepath, string _folder)    {        filepath = _filepath;        folder = _folder;        folder = folder.Replace("/",@"\");        if (folder.EndsWith(@"\") == false)            folder = folder + @"\";    }    /// <summary>    /// 将PDF文件转换成一个完整的HTML    /// filepath为PDF源文件，必须将文件路径填写完整    /// folder为最终保存目录，生成文件均在此目录下    /// </summary>    /// <returns></returns>    public bool Pdf2Html_NoSplit()    {        //判断PDF文件是否存在        if (File.Exists(filepath) == false)            return false;        folder = folder.Replace("/", @"\");        if (folder.EndsWith(@"\") == false)            folder = folder + @"\";        if (Directory.Exists(folder) == true)            Directory.Delete(folder,true);        Directory.CreateDirectory(folder);        Document doc = new Document(filepath);        HtmlSaveOptions hso = new HtmlSaveOptions();        hso.SplitIntoPages = false;        hso.FixedLayout = true;        hso.CompressSvgGraphicsIfAny = true;

        //我偏向于所有资源存放在一个文件夹内，因此，需要重写下面三个函数        hso.CustomResourceSavingStrategy = new HtmlSaveOptions.ResourceSavingStrategy(ResourceStrategy);        hso.CustomCssSavingStrategy = new HtmlSaveOptions.CssSavingStrategy(CssStrategy);        hso.CustomStrategyOfCssUrlCreation = new HtmlSaveOptions.CssUrlMakingStrategy(CssUrlStrategy);        hso.FontSavingMode = HtmlSaveOptions.FontSavingModes.AlwaysSaveAsTTF;        string outpath = folder + filename + ".html";        try        {            doc.Save(outpath, hso);            return true;        }        catch        {            Directory.Delete(folder,true);            return false;        }    }/// <summary>    /// 根据PDF文件生成首页缩略图    /// </summary>    /// <param name="_input">PDF源文件完整路径</param>    /// <param name="_output">图片保存路径</param>    public void CreateThumb(string _input,string _output) {        if (File.Exists(_output) == true)            File.Delete(_output);        using (Document doc = new Document(_input))        using (FileStream imgstream = new FileStream(_output, FileMode.Create))        {            //图片显示质量            Aspose.Pdf.Devices.Resolution resolution = new Aspose.Pdf.Devices.Resolution(100);            Aspose.Pdf.Devices.PngDevice device = new Aspose.Pdf.Devices.PngDevice(resolution);            device.Process(doc.Pages[1], imgstream);            imgstream.Close();        }    }    /// <summary>    /// 从PDF文件中提取正文    /// </summary>    /// <param name="_input">PDF文件目录</param>    /// <returns></returns>    public string GetTxtFromPDF(string _input)    {        Document doc = new Document(_input);        StringBuilder sb = new StringBuilder();        for (int i = 1; i <= doc.Pages.Count; i++)        {            Aspose.Pdf.Text.TextAbsorber ab = new Aspose.Pdf.Text.TextAbsorber();            ab.TextSearchOptions.LimitToPageBounds = true;            try            {                doc.Pages[i].Accept(ab);                sb.Append(ab.Text);            }            catch {                return null;            }        }        sb = sb.Replace("\r\n", " ").Replace("　"," ");         string output = sb.ToString();        while (output.IndexOf("  ") >= 0)            output = output.Replace("  "," ");        return output;    }/// <summary>    /// 对字体、图片进行重命名，如果不用该函数，页面可能出现异常    /// </summary>    /// <param name="resource"></param>    /// <returns></returns>    private string ResourceStrategy(SaveOptions.ResourceSavingInfo resource)    {        string resourcename = "";        if (resource.ResourceType == SaveOptions.NodeLevelResourceType.Image)            resourcename = Guid.NewGuid().ToString() + Path.GetExtension(resource.SupposedFileName);        else            resourcename = resource.SupposedFileName;        if (!Directory.Exists(folder))            Directory.CreateDirectory(folder);        string outfile = folder + resourcename;        if (File.Exists(resourcename) == true)            return resourcename;        System.IO.BinaryReader reader = new BinaryReader(resource.ContentStream);        System.IO.File.WriteAllBytes(outfile, reader.ReadBytes((int)resource.ContentStream.Length));        return resourcename;    }/// <summary>    /// 生成页面引用的css文件    /// </summary>    /// <param name="resource"></param>    private void CssStrategy(HtmlSaveOptions.CssSavingInfo resource)    {        string path = folder+ filename + @".css";        BinaryReader reader = new BinaryReader(resource.ContentStream);        File.WriteAllBytes(path, reader.ReadBytes((int)resource.ContentStream.Length));    }    /// <summary>    /// 对页面引用的css地址进行重写    /// </summary>    /// <param name="resource"></param>    /// <returns></returns>    private string CssUrlStrategy(HtmlSaveOptions.CssUrlRequestInfo resource)    {        return filename + ".css";    }}