word ppt excel文档转换成pdf的C#实现代码

using Word = Microsoft.Office.Interop.Word;
using Excel = Microsoft.Office.Interop.Excel;
using PowerPoint = Microsoft.Office.Interop.PowerPoint;
using Microsoft.Office.Core;
 

namespace ConvertToPDF
{
    public partial class Form1 : Form
    {

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {

            if (DOCConvertToPDF("C:/test.doc", "C:/testD.pdf"))
            {
                MessageBox.Show("DOC转换成功！");
            }
            else
            {
                MessageBox.Show("对不起，转换失败！");
            }

            if (XLSConvertToPDF("C:/test.xls", "C:/testX.pdf"))
            {
                MessageBox.Show("XLS转换成功！");
            }
            else
            {
                MessageBox.Show("对不起，转换失败！");
            }
            if (PPTConvertToPDF("C:/需求提纲.pptx", "C:/testP.pdf"))
            {
                MessageBox.Show("PPT转换成功！");
            }
            else
            {
                MessageBox.Show("对不起，转换失败！");
            }

        }
        //Word转换成pdf
        ///<summary>
        /// 把Word文件转换成为PDF格式文件
        ///</summary>
        ///<param name="sourcePath">源文件路径</param>
        ///<param name="targetPath">目标文件路径</param>
        ///<returns>true=转换成功</returns>
        private bool DOCConvertToPDF(string sourcePath, string targetPath)
        {
            bool result=false;
            Word.WdExportFormat exportFormat = Word.WdExportFormat.wdExportFormatPDF;
            object paramMissing = Type.Missing;
            Word.ApplicationClass wordApplication = new Word.ApplicationClass();
            Word.Document wordDocument = null;
            try
            {
                object paramSourceDocPath = sourcePath;
                string paramExportFilePath = targetPath;

                Word.WdExportFormat paramExportFormat = exportFormat;
                bool paramOpenAfterExport = false;
                Word.WdExportOptimizeFor paramExportOptimizeFor = Word.WdExportOptimizeFor.wdExportOptimizeForPrint;
                Word.WdExportRange paramExportRange = Word.WdExportRange.wdExportAllDocument;
                int paramStartPage = 0;
                int paramEndPage = 0;
                Word.WdExportItem paramExportItem = Word.WdExportItem.wdExportDocumentContent;
                bool paramIncludeDocProps = true;
                bool paramKeepIRM = true;
                Word.WdExportCreateBookmarks paramCreateBookmarks = Word.WdExportCreateBookmarks.wdExportCreateWordBookmarks;
                bool paramDocStructureTags = true;
                bool paramBitmapMissingFonts = true;
                bool paramUseISO19005_1 = false;

                wordDocument = wordApplication.Documents.Open(
                ref paramSourceDocPath, ref paramMissing, ref paramMissing,
                ref paramMissing, ref paramMissing, ref paramMissing,
                ref paramMissing, ref paramMissing, ref paramMissing,
                ref paramMissing, ref paramMissing, ref paramMissing,
                ref paramMissing, ref paramMissing, r