C#实现MS-Office文档转Pdf（Word、Execel、PowerPoint、Visio、Project）

using System;
using Microsoft.Office.Core;  

namespace Office
{
    class Util
    {
        private Util() { }
        /// <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>
        public static bool WordToPDF(string sourcePath, string targetPath)
        {
            bool result = false;
            Microsoft.Office.Interop.Word.WdExportFormat exportFormat = Microsoft.Office.Interop.Word.WdExportFormat.wdExportFormatPDF;
            Microsoft.Office.Interop.Word.ApplicationClass application = null;  

            Microsoft.Office.Interop.Word.Document document = null;
            try
            {
                application = new Microsoft.Office.Interop.Word.ApplicationClass();
                application.Visible = false;
                document = application.Documents.Open(sourcePath);
                document.SaveAs2();
                document.ExportAsFixedFormat(targetPath, exportFormat);
                result = true;
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
                result = false;
            }
            finally
            {
                if (document != null)
                {
                    document.Close();
                    document = null;
                }
                if (application != null)
                {
                    application.Quit();
                    application = null;
                }
                GC.Collect();
                GC.WaitForPendingFinalizers();
                GC.Collect();
                GC.WaitForPendingFinalizers();
            }
            return result;
        }  

        /// <summary>
        /// 把Microsoft.Office.Interop.Excel文件转换成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>
        public static bool ExcelToPDF(string sourcePath, string targetPath)
        {
            bool result = false;
            Microsoft.Office.Interop.Excel.XlFixedFormatType targetType = Microsoft.Office.Interop.Excel.XlFixedFormatType.xlTypePDF;
            object missing = Type.Missing;
            Microsoft.Office.Interop.Excel.ApplicationClass application = null;
            Microsoft.Office.Interop.Excel.Workbook workBook = null;
            try
            {
                application = new Microsoft.Office.Interop.Excel.ApplicationClass();
                application.Visible = false;
                workBook = application.Workbooks.Open(sourcePath);
                workBook.SaveAs();
                workBook.ExportAsFixedFormat(targetType, targetPath);
                result = true;
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
                result = false;
            }
            finally
            {
                if (workBook != null)
                {
                    workBook.Close(true, missing, missing);
                    workBook = null;
                }
                if (application != null)
                {
                    application.Quit();
                    application = null;
                }
                GC.Collect();
                GC.WaitForPendingFinalizers();
                GC.Collect();
                GC.WaitForPendingFinalizers();
            }
            return result;
        }
        /// <summary>
        /// 把PowerPoint文件转换成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>
        public static bool PowerPointToPDF(string sourcePath, string targetPath)
        {
            bool result;
            Microsoft.Office.Interop.PowerPoint.PpSaveAsFileType targetFileType = Microsoft.Office.Interop.PowerPoint.PpSaveAsFileType.ppSaveAsPDF;
            object missing = Type.Missing;
            Microsoft.Office.Interop.PowerPoint.ApplicationClass application = null;
            Microsoft.Office.Interop.PowerPoint.Presentation persentation = null;
            try
            {
                application = new Microsoft.Office.Interop.PowerPoint.ApplicationClass();
                //application.Visible = MsoTriState.msoFalse;
                persentation = application.Presentations.Open(sourcePath, MsoTriState.msoTrue, MsoTriState.msoFalse, MsoTriState.msoFalse);
                persentation.SaveAs(targetPath, targetFileType, Microsoft.Office.Core.MsoTriState.msoTrue);  

                result = true;
            }
            catch(Exception e)
            {
                Console.WriteLine(e.Message);
                result = false;
            }
            finally
            {
                if (persentation != null)
                {
                    persentation.Close();
                    persentation = null;
                }
                if (application != null)
                {
                    application.Quit();
                    application = null;
                }
                GC.Collect();
                GC.WaitForPendingFinalizers();
                GC.Collect();
                GC.WaitForPendingFinalizers();
            }
            return result;
        }  

        /// <summary>
        /// 把Visio文件转换成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>
        public static bool VisioToPDF(string sourcePath, string targetPath)
        {
            bool result;
            Microsoft.Office.Interop.Visio.VisFixedFormatTypes targetType = Microsoft.Office.Interop.Visio.VisFixedFormatTypes.visFixedFormatPDF;
            object missing = Type.Missing;
            Microsoft.Office.Interop.Visio.ApplicationClass application = null;
            Microsoft.Office.Interop.Visio.Document document = null;
            try
            {
                application = new Microsoft.Office.Interop.Visio.ApplicationClass();
                application.Visible = false;
                document = application.Documents.Open(sourcePath);
                document.Save();
                document.ExportAsFixedFormat(targetType, targetPath, Microsoft.Office.Interop.Visio.VisDocExIntent.visDocExIntentScreen, Microsoft.Office.Interop.Visio.VisPrintOutRange.visPrintAll);
                result = true;
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
                result = false;
            }
            finally
            {
                if (application != null)
                {
                    application.Quit();
                    application = null;
                }
                GC.Collect();
                GC.WaitForPendingFinalizers();
                GC.Collect();
                GC.WaitForPendingFinalizers();
            }
            return result;
        }