word转html实现预览（asp.net）

word转html

需要通过nuget 安装

Microsoft.Office.Interop.Word   Microsoft.Office.Interop.Excel  
使用 Microsoft.AspNetCore.Hosting;获取绝对的物理地址，将生成的html放到对应的物理地址上

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Microsoft.Office.Interop.Excel;
using System.Diagnostics;
using System.IO;
using Microsoft.Office.Interop.Word;
using Microsoft.AspNetCore.Mvc;
using System.Net;
using Microsoft.AspNetCore.Hosting;

namespace wordTest.Controllers
{
    public class HomeController : Controller
    {
　　　　　//依赖注入获取绝对物理地址的对象
        private readonly IHostingEnvironment _hostingEnvironment;

        public HomeController(IHostingEnvironment hostingEnvironment)
        {
            _hostingEnvironment = hostingEnvironment;
        }
        #region Index页面
        /// <summary>
        /// Index页面
        /// </summary>
        /// <paramname="url">例：/uploads/......XXX.xls</param>
        public ActionResult Index(string url)
            {
　　　　　　　　//绝对定位资源文件夹(wwwroot)下到D://.../wwwroot/
            string webRootPath = _hostingEnvironment.WebRootPath;
　　　　　　　　//绝对定位到项目根目录下D://.../
            string contentRootPath = _hostingEnvironment.ContentRootPath;
            url = "/files/charts.docx";
            string physicalPath = webRootPath + url;
　　　　　　　　//获取后缀名
            string extension = Path.GetExtension(physicalPath);

                string htmlUrl = "";
                switch (extension.ToLower())
                {
                    case ".xls":
                    case ".xlsx":
                        htmlUrl = PreviewExcel(physicalPath, url);
                        break;
                    case ".doc":
                    case ".docx":
                        htmlUrl = PreviewWord(physicalPath, url);
                        break;
                    case ".txt":
                        htmlUrl = PreviewTxt(physicalPath, url);
                        break;
                    case ".pdf":
                        htmlUrl = PreviewPdf(physicalPath, url);
                        break;
                    case ".jpg":
                    case ".jpeg":
                    case ".bmp":
                    case ".gif":
                    case ".png":
                        htmlUrl = PreviewImg(physicalPath, url);
                        break;
                    default:
                        htmlUrl = PreviewOther(physicalPath, url);
                        break;
                }
　　　　　　　　　　//跳转到转换后的html页面（转换后的页面）
                return Redirect(Url.Content(htmlUrl));
            }
            #endregion

            #region 预览Excel
            /// <summary>
            /// 预览Excel
            /// </summary>
            public string PreviewExcel(string physicalPath, string url)
            {
                Microsoft.Office.Interop.Excel.Application application = null;
                Microsoft.Office.Interop.Excel.Workbook workbook = null;
                application = new Microsoft.Office.Interop.Excel.Application();
                object missing = Type.Missing;
                object trueObject = true;
                application.Visible = false;
                application.DisplayAlerts = false;
                workbook = application.Workbooks.Open(physicalPath, missing, trueObject, missing, missing, missing,
                   missing, missing, missing, missing, missing, missing, missing, missing, missing);
                //Save Excelto Html
                object format = Microsoft.Office.Interop.Excel.XlFileFormat.xlHtml;
                string htmlName = Path.GetFileNameWithoutExtension(physicalPath) + ".html";
                String outputFile = Path.GetDirectoryName(physicalPath) + "\" + htmlName;
                workbook.SaveAs(outputFile, format, missing, missing, missing,
                                  missing, XlSaveAsAccessMode.xlNoChange, missing,
                                  missing, missing, missing, missing);
                workbook.Close();
                application.Quit();
                return Path.GetDirectoryName(WebUtility.UrlDecode(url)) + "\" + htmlName;
            }
            #endregion

            #region 预览Word
            /// <summary>
            /// 预览Word
            /// </summary>
            public string PreviewWord(string physicalPath, string url)
            {
                Microsoft.Office.Interop.Word._Application application = null;
                Microsoft.Office.Interop.Word._Document doc = null;
                application = new Microsoft.Office.Interop.Word.Application();
                object missing = Type.Missing;
                object trueObject = true;
                application.Visible = false;
                application.DisplayAlerts = WdAlertLevel.wdAlertsNone;
                doc = application.Documents.Open(physicalPath, missing, trueObject, missing, missing, missing,
                   missing, missing, missing, missing, missing, missing, missing, missing, missing, missing);
                //Save Excelto Html
                object format = Microsoft.Office.Interop.Word.WdSaveFormat.wdFormatHTML;
                string htmlName = Path.GetFileNameWithoutExtension(physicalPath) + ".html";
                String outputFile = Path.GetDirectoryName(physicalPath) + "\" + htmlName;
                doc.SaveAs(outputFile, format, missing, missing, missing,
                                  missing, XlSaveAsAccessMode.xlNoChange, missing,
                                  missing, missing, missing, missing);
                doc.Close();
                application.Quit();
                return Path.GetDirectoryName(WebUtility.UrlDecode(url)) + "\" + htmlName;
            }
            #endregion

            #region 预览Txt
            /// <summary>
            /// 预览Txt
            /// </summary>
            public string PreviewTxt(string physicalPath, string url)
            {
                return WebUtility.UrlDecode(url);
            }
            #endregion

            #region 预览Pdf
            /// <summary>
            /// 预览Pdf
            /// </summary>
            public string PreviewPdf(string physicalPath, string url)
            {
                return WebUtility.UrlDecode(url);
            }
            #endregion

            #region 预览图片
            /// <summary>
            /// 预览图片
            /// </summary>
            public string PreviewImg(string physicalPath, string url)
            {
                return WebUtility.UrlDecode(url);
            }
            #endregion

            #region 预览其他文件
            /// <summary>
            /// 预览其他文件
            /// </summary>
            public string PreviewOther(string physicalPath, string url)
            {
                return WebUtility.UrlDecode(url);
            }
            #endregion
        }
    }

注意，使用的office不兼容asp.netCore2.1版本变成netFramework版本