c#调用office将word转pdf,该怎么处理

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using O2S.Components.PDFRender4NET;

using Word = Microsoft.Office.Interop.Word;

using Excel = Microsoft.Office.Interop.Excel;

using PowerPoint = Microsoft.Office.Interop.PowerPoint;

using Microsoft.Office.Core;

using System.IO;

using System.Text;







/*using System;

using System.Collections.Generic;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;*/

using System.Data;

using DTcms.Common;


namespace DTcms.Web.admin.download

{

    public partial class edit : Web.UI.ManagePage

    {

        private string action = DTEnums.ActionEnum.Add.ToString(); //操作类型

        private int channel_id;

        private int id = 0;


        protected void Page_Load(object sender, EventArgs e)

        {

            string _action = DTRequest.GetQueryString("action");

            this.channel_id = DTRequest.GetQueryInt("channel_id");

            if (this.channel_id == 0)

            {

                JscriptMsg("频道参数不正确！", "back", "Error");

                return;

            }

            if (!string.IsNullOrEmpty(_action) && _action == DTEnums.ActionEnum.Edit.ToString())

            {

                this.action = DTEnums.ActionEnum.Edit.ToString();//修改类型

                this.id = DTRequest.GetQueryInt("id");

                if (this.id == 0)

                {

                    JscriptMsg("传输参数不正确！", "back", "Error");

                    return;

                }

                if (!new BLL.article().Exists(this.id))

                {

                    JscriptMsg("信息不存在或已被删除！", "back", "Error");

                    return;

                }

            }

            if (!Page.IsPostBack)

            {

                TreeBind(this.channel_id); //绑定类别

                if (action == DTEnums.ActionEnum.Edit.ToString()) //修改

                {

                    ShowInfo(this.id);

                }

            }

        }




        /// <summary>

        /// word转换PDF

        /// </summary>

        /// <param name="sourcePath"></param>

        /// <param name="targetPath"></param>

        /// <returns></returns>


        private bool WordToPDF(string sourcePath, string targetPath)