生成的excel转成Pdf（接上篇）

Npoi生成的Excel

  /// <summary>
        /// excel To PDf
        /// </summary>
        /// <param name="excelPath">l源文件路径</param>
        /// <param name="pdfPath">目的文件路径</param>
        /// <returns></returns>
        public static bool ConverterToPdf(string excelPath, string pdfPath)
        {
            Application excelApp = null;
            Workbooks excelWorkBooks = null;
            Workbook excelWorkBook = null;
            string lstrTemp = string.Empty;
            object lobjMissing = System.Reflection.Missing.Value;
            try
            {
                excelApp = new Application();
                //hide all excel(appliction)
                excelApp.Visible = true;
                excelWorkBooks = excelApp.Workbooks;
                //打开excel，得到WorkBook对象
                excelWorkBook = excelWorkBooks.Open(excelPath, true, true, lobjMissing, lobjMissing, lobjMissing, true,
                    lobjMissing, lobjMissing, lobjMissing, lobjMissing, lobjMissing, false, lobjMissing, lobjMissing);

                lstrTemp = Path.GetTempPath() + Guid.NewGuid().ToString() + ".xls" +
                           (excelWorkBook.HasVBProject ? 'm' : 'x');
                //lstrTemp = System.IO.Path.GetTempPath() + Guid.NewGuid().ToString() + ".xls";

                excelWorkBook.SaveAs(lstrTemp, XlFileFormat.xlExcel4Workbook, Type.Missing, Type.Missing, Type.Missing,
                    false, XlSaveAsAccessMode.xlNoChange, Type.Missing, false, Type.Missing, Type.Missing,
                    Type.Missing);

                //输出为PDF
                excelWorkBook.ExportAsFixedFormat(XlFixedFormatType.xlTypePDF, pdfPath,
                    XlFixedFormatQuality.xlQualityStandard, Type.Missing, false, Type.Missing, Type.Missing, false,
                    Type.Missing);

                //关闭workbooks
                excelWorkBooks.Close();
                //退出excel
                excelApp.Quit();
            }
            catch (Exception ex)
            {
                //其他日志操作；
                return false;
            }
            finally
            {
                if (excelWorkBook != null)
                {
                    Marshal.ReleaseComObject(excelWorkBook);
                    excelWorkBook = null;
                }

                if (excelWorkBooks != null)
                {
                    excelWorkBooks.Close();
                    Marshal.ReleaseComObject(excelWorkBooks);
                    excelWorkBooks = null;
                }

                if (excelApp != null)
                {
                    excelApp.Quit();
                    Marshal.ReleaseComObject(excelApp);
                    excelApp = null;
                }
                //删掉转换之前的excel
                if (File.Exists(excelPath))
                {
                    File.Delete(excelPath);
                }

                //主动激活垃圾回收器，主要是避免超大批量转文档时，内存占用过多，而垃圾回收器并不是时刻都在运行！
                GC.Collect();
                GC.WaitForPendingFinalizers();
            }

            return true;
        }

　　反正就不明绝厉，要注意COM组件的注册。

摘别人的：

https://blog.csdn.net/cyj0531/article/details/53423753

对了，需要安装包。 Microsoft office interop.Excel packages.