MVC 在线预览word, excel Aspose 在线预览 word exel pdf 图片 等文件 去水印

/// <summary>
    /// 文件在线预览
    /// </summary>
    public class OnlinePreviewHelper
    {
        public class OnlinePreviewModel
        {

        }
        /// <summary>
        /// world,ppt,excel生成html
        /// </summary>
        /// <param name="sourceDocPath">需要转换的文档绝对文件路径</param>
        /// <param name="relativeDocPath">需要转换的文档相对文件路径</param>
        /// <returns></returns>
        public string OfficeDocumentToHtml(string sourceDocPath, string relativeDocPath)
        {
            string result = "";
            var fileName = Guid.NewGuid().ToString("N").ToLower();
            //var catalogName = $"/Files/Preview/temp/{fileName}";
            var catalogConfig = Path.GetDirectoryName(sourceDocPath);

            var catalogName = $@"/html/";

            string filePath = $@"{catalogConfig}{catalogName.Replace("/", "\\")}";
            if (!Directory.Exists(filePath))
                Directory.CreateDirectory(filePath);

            result = $"{catalogConfig}{catalogName}/{fileName}.html";

            //string saveDocPath = HttpContext.Current.Server.MapPath(result.data.PreviewFileUrl);
            string saveDocPath = $@"{filePath}/{fileName}.html";
            if (!File.Exists(saveDocPath))
            {
                File.WriteAllText(saveDocPath, "", Encoding.UTF8);
            }

            //获取文件扩展名
            string docExtendName = Path.GetExtension(sourceDocPath).ToLower();
            switch (docExtendName)
            {
                case ".doc":
                case ".docx":                    
                    new Aspose.Words.License().SetLicense(new MemoryStream(Convert.FromBase64String("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")));
                    Document doc = new Document(sourceDocPath);
                    doc.Save(saveDocPath, Aspose.Words.SaveFormat.Html);
                    break;
                case ".xls":
                case ".xlsx":                    
                    new Aspose.Cells.License().SetLicense(new MemoryStream(Convert.FromBase64String("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")));
                    Workbook workbook = new Workbook(sourceDocPath);
                    workbook.Save(saveDocPath, Aspose.Cells.SaveFormat.Html);
                    break;
                case ".ppt":
                case ".pptx":
                    Presentation pres = new Presentation(sourceDocPath);
                    pres.Save(saveDocPath, Aspose.Slides.Export.SaveFormat.Html);
                    break;
                case ".pdf":

                    PdfToHtml(relativeDocPath, saveDocPath);
                    break;
                default:
                    result = "";
                    //删除生成的预览文件
                    //File.Delete(saveDocPath);
                    break;
            }

            return Path.GetDirectoryName(relativeDocPath) + $"\\html\\{fileName}.html"; 
        }

        /// <summary>
        /// pdf生成html
        /// </summary>
        /// <param name="fileName">需要生成的原始文档文件</param>
        /// <param name="saveDocPath"></param>
        /// <returns></returns>
        private static bool PdfToHtml(string fileName, string saveDocPath)
        {
            //模板文件
            string templateFile = HttpContext.Current.Server.MapPath("/Files/Preview/templatepdf.html");
            //---------------------读html模板页面到stringbuilder对象里---- 
            StringBuilder htmltext = new StringBuilder();
            using (StreamReader sr = new StreamReader(templateFile)) //模板页路径
            {
                String line;
                while ((line = sr.ReadLine()) != null)
                {
                    htmltext.Append(line);
                }
                sr.Close();
            }

            fileName = fileName.Replace("\\", "/");
            //----------替换htm里的标记为你想加的内容 
            htmltext.Replace("$PDFFILEPATH", fileName);

            //----------生成htm文件------------------―― 
            using (StreamWriter sw = new StreamWriter(saveDocPath, false,
                    Encoding.GetEncoding("utf-8"))) //保存地址
            {
                sw.WriteLine(htmltext);
                sw.Flush();
                sw.Close();
            }

            return true;
        }
    }