csharp 适用于.NET MVC Modern UI的GroupDocs.Viewer

Posted 2021-05-12

using GroupDocs.Viewer.Converter.Options;
using GroupDocs.Viewer.Domain;
using GroupDocs.Viewer.Domain.Html;
using GroupDocs.Viewer.Handler;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Viewer_Modren_UI.Helpers;


namespace Viewer_Modren_UI.Controllers
{
    [RoutePrefix("Attachment/html")]
    public class AttachmentHtmlController : Controller
    {
        private static string _cachePath = AppDomain.CurrentDomain.GetData("DataDirectory") + "\\cache";
        [Route("")]
        public ActionResult Get(string file, string attachment, int page, string watermarkText, int? watermarkColor, WatermarkPosition? watermarkPosition, int? watermarkWidth, byte watermarkOpacity)
        {
            var attachmentPath = "cache\\"+  Path.GetFileNameWithoutExtension(file) + Path.GetExtension(file).Replace(".", "_") + "\\attachments\\" + attachment;
            ViewerHtmlHandler handler = Utils.CreateViewerHtmlHandler();
            var docInfo = handler.GetDocumentInfo(file);
            List<int> pageNumberstoRender = new List<int>();
            pageNumberstoRender.Add(page);
            HtmlOptions o = new HtmlOptions();
            o.PageNumbersToRender = pageNumberstoRender;
            o.PageNumber = page;
            o.CountPagesToRender = 1;
            o.HtmlResourcePrefix = "/attachment/resource?file="+file+"&attachment="+attachment+"&page="+page+"&resource=";
            if (watermarkText != "")
                o.Watermark = Utils.GetWatermark(watermarkText, watermarkColor, watermarkPosition, watermarkWidth, watermarkOpacity);
            string fullHtml = "";
            var attachmentFile = _cachePath +"\\" + Path.GetFileNameWithoutExtension(file) + Path.GetExtension(file).Replace(".", "_") + "\\attachments";
            if (Directory.Exists(attachmentFile.Replace(@"\\", @"\")))
            {
                List<PageHtml> pages = handler.GetPages(attachmentPath, o);
                foreach (PageHtml pageHtml in pages.Where(x => x.PageNumber == page)) { fullHtml += pageHtml.HtmlContent; };
            }
            else
            {
               
                foreach (AttachmentBase attachmentBase in docInfo.Attachments.Where(x => x.Name == attachment))
                {
                    // Get attachment document html representation
                    List<PageHtml> pages = handler.GetPages(attachmentBase, o);
                    foreach (PageHtml pageHtml in pages.Where(x => x.PageNumber == page)) { fullHtml += pageHtml.HtmlContent; };
                }
            }
            return Content(fullHtml);
        }
    }
}