using Microsoft.Office.Interop.Word;

/// <summary>
    /// 把Word文件轉換成pdf文件
    /// </summary>
    /// <param name="sourcePath">需要轉換的文件路徑和文件名稱</param>
    /// <param name="targetPath">轉換完成后的文件的路徑和文件名名稱</param>
    /// <returns>成功返回true,失敗返回false</returns>
    public static bool WordToPdf(string sourcePath, string targetPath)
    {
        bool result = false;
        WdExportFormat wdExportFormatPDF = WdExportFormat.wdExportFormatPDF;//轉換格式1.wdExportFormatPDF轉換成pdf格式 2.wdExportFormatXPS轉換成xps格式
        object missing = Type.Missing;
        Microsoft.Office.Interop.Word.ApplicationClass applicationClass = null;
        Document document = null;
        try
        {
            applicationClass = new Microsoft.Office.Interop.Word.ApplicationClass();
            object inputfileName = sourcePath;//需要轉格式的文件路徑
            string outputFileName = targetPath;//轉換完成后PDF或XPS文件的路徑和文件名名稱
            WdExportFormat exportFormat = wdExportFormatPDF;//導出文件所使用的格式
            bool openAfterExport = false;//轉換完成后是否打開
            WdExportOptimizeFor wdExportOptimizeForPrint = WdExportOptimizeFor.wdExportOptimizeForPrint;//導出方式1.wdExportOptimizeForPrint針對打印進行導出，質量較高，生成的文件大小較大。2.wdExportOptimizeForOnScreen 針對屏幕顯示進行導出，質量較差，生成的文件大小較小。
            WdExportRange wdExportAllDocument = WdExportRange.wdExportAllDocument;//導出全部內容（枚舉）
            int from = 0;//起始頁碼
            int to = 0;//結束頁碼
            WdExportItem wdExportDocumentContent = WdExportItem.wdExportDocumentContent;//指定導出過程中是否只包含文本或包含文本的標記.1.wdExportDocumentContent:導出文件沒有標記,2.導出文件有標記
            bool includeDocProps = true;//指定是否包含新導出的文件在文檔屬性
            bool keepIRM = true;//
            WdExportCreateBookmarks wdExportCreateWordBookmarks = WdExportCreateBookmarks.wdExportCreateWordBookmarks;//1.wdExportCreateNoBookmarks:不要在導出文件中創建書簽,2.wdExportCreateHeadingBookmarks：標題和文本框導出的文件中創建一個書簽，3.wdExportCreateWordBookmarks每個字的書簽，其中包括除包含頁眉和頁腳中的所有書簽導出的文件中創建一個書簽。
            bool docStructureTags = true;
            bool bitmapMissingFonts = true;
            bool UseISO19005_1 = false;//生成的文檔是否符合 ISO 19005-1 (PDF/A)
            document = applicationClass.Documents.Open(ref inputfileName, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing);
            if (document != null)
            {
                document.ExportAsFixedFormat(outputFileName, exportFormat, openAfterExport, wdExportOptimizeForPrint, wdExportAllDocument, from, to, wdExportDocumentContent, includeDocProps, keepIRM, wdExportCreateWordBookmarks, docStructureTags, bitmapMissingFonts, UseISO19005_1, ref missing);
            }
            result = true;
        }
        catch
        {
            result = false;
        }
        finally
        {
            if (document != null)
            {
                document.Close(ref missing, ref missing, ref missing);
                document = null;
            }
            if (applicationClass != null)
            {
                applicationClass.Quit(ref missing, ref missing, ref missing);
                applicationClass = null;
            }
        }
        return result;
    }

/// <summary>
    /// 把Word文件轉換成pdf文件
    /// </summary>
    /// <param name="sourcePath">需要轉換的文件路徑和文件名稱</param>
    /// <param name="targetPath">轉換完成后的文件的路徑和文件名名稱</param>
    /// <returns>成功返回true,失敗返回false</returns>
    public static bool WordToPdf(object sourcePath, string targetPath)
    {
        bool result = false;
        WdExportFormat wdExportFormatPDF = WdExportFormat.wdExportFormatPDF;
        object missing = Type.Missing;
        Microsoft.Office.Interop.Word.ApplicationClass applicationClass = null;
        Document document = null;
        try
        {
            applicationClass = new Microsoft.Office.Interop.Word.ApplicationClass();
            document = applicationClass.Documents.Open(ref sourcePath, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing);
            if (document != null)
            {
                document.ExportAsFixedFormat(targetPath, wdExportFormatPDF, false, WdExportOptimizeFor.wdExportOptimizeForPrint, WdExportRange.wdExportAllDocument, 0, 0, WdExportItem.wdExportDocumentContent, true, true, WdExportCreateBookmarks.wdExportCreateWordBookmarks, true, true, false, ref missing);
            }
            result = true;
        }
        catch
        {
            result = false;
        }
        finally
        {
            if (document != null)
            {
                document.Close(ref missing, ref missing, ref missing);
                document = null;
            }
            if (applicationClass != null)
            {
                applicationClass.Quit(ref missing, ref missing, ref missing);
                applicationClass = null;
            }
        }
        return result;
    }

OfficeToPdf.WordToPdf("d://1234.doc", "d://1234.pdf");