将Word,PDF文档转化为图片

#region 将Word文档转化为图片
    /// <summary>
    /// 将Word文档转化为图片
    /// </summary>
    /// <param name="wordpath">需要转换的word文档的全路径</param>
    public void Word_Convert2Image(string wordpath)
    {
        //第一步：将Word文档转化为Pdf文档（中间过程）
        Aspose.Words.Document doc = new Aspose.Words.Document(wordpath);
        //生成的pdf的路径
        string Pdfpath = Server.MapPath("images") + "Word2Pdf.pdf";
        doc.Save(Pdfpath, Aspose.Words.SaveFormat.Pdf);  //生成中间文档pdf

        //第二部：开始把第一步中转化的pdf文档转化为图片
        int i = 1;
        Aspose.Pdf.Document pdfDocument = new Aspose.Pdf.Document(Pdfpath);
        while (i <= pdfDocument.Pages.Count)
        {
            if (!string.IsNullOrEmpty(Pdfpath))
            {
                GetImage(Pdfpath, i);
                GC.Collect();  //回收内存
            }
            i++;
        }
        //图片转化完成之后，删除中间过程产生的pdf文档
        if (File.Exists(Pdfpath))
            File.Delete(Pdfpath);
    }
    #endregion
    #region 将pdf转化为图片
    /// <summary>
    /// 将PDF 相应的页转换为图片
    /// </summary>
    /// <param name="strPDFpath">PDF 路径</param>
    /// <param name="Page">需要转换的页页码</param>
    private void GetImage(string strPDFpath, int Page)
    {
        GC.Collect();
        string strSavePath = Server.MapPath("images");
        byte[] ImgData = GetImgData(strPDFpath, Page);
        MemoryStream ms = new MemoryStream(ImgData, 0, ImgData.Length);
        Bitmap returnImage = (Bitmap)Bitmap.FromStream(ms);
        string picName=string.Format("{0}_{1}.jpg", CreatePicName(),Page);
        string strImgPath = Path.Combine(strSavePath, picName);  //图片名称可在此修改
        returnImage.Save(strImgPath);
        returnImage.Dispose();
        ms.Dispose();
        AddImage(Page, picName);  //将图片添加到数据库
    }
    /// <summary>
    /// 从PDF中获取首页的图片
    /// </summary>
    /// <param name="PDFPath">PDF 文件路径</param>
    /// <param name="Page">需要获取的第几页</param>
    /// <returns></returns>
    private byte[] GetImgData(string PDFPath, int Page)
    {
        System.Drawing.Image img = PDFView.ConvertPDF.PDFConvert.GetPageFromPDF(PDFPath, Page, 200, "", true);
        return GetDataByImg(img);//读取img的数据并返回
    }
    /// <summary>
    /// 将单页的PDF转换为图片
    /// </summary>
    /// <param name="_image"></param>
    /// <returns></returns>
    private byte[] GetDataByImg(System.Drawing.Image _image)
    {
        System.IO.MemoryStream Ms = new MemoryStream();
        _image.Save(Ms, System.Drawing.Imaging.ImageFormat.Jpeg);
        byte[] imgdata = new byte[Ms.Length];
        Ms.Position = 0;
        Ms.Read(imgdata, 0, Convert.ToInt32(Ms.Length));
        Ms.Close();
        return imgdata;
    }
    #endregion