直接在线预览Word、Excel、TXT文件之ASP.NET

具体实现过程不多说了，直接贴代码了。

using system;
using system.collections.generic;
using system.linq;
using system.web;
using system.web.mvc;
using microsoft.office.interop.excel;
using system.diagnostics;
using system.io;
using microsoft.office.interop.word;
namespace suya.web.apps.areas.pmp.controllers
{
  /// <summary>
  /// 在线预览office文件
  /// </summary>
  public class officeviewcontroller : controller
  {
    #region index页面
    /// <summary>
    /// index页面
    /// </summary>
    /// <param name="url">例：/uploads/......xxx.xls</param>
    public actionresult index(string url)
    {
      string physicalpath = server.mappath(server.urldecode(url));
      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;
      }
      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 excel to 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(server.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 excel to 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(server.urldecode(url)) + "\\" + htmlname;
    }
    #endregion
    #region 预览txt
    /// <summary>
    /// 预览txt
    /// </summary>
    public string previewtxt(string physicalpath, string url)
    {
      return server.urldecode(url);
    }
    #endregion
    #region 预览pdf
    /// <summary>
    /// 预览pdf
    /// </summary>
    public string previewpdf(string physicalpath, string url)
    {
      return server.urldecode(url);
    }
    #endregion
  }
}

以上就是针对直接在线预览word、excel、text、pdf文件的全部内容，希望大家喜欢。