.net / .net core excel转pdf

方法1，调用Microsoft.Office.Interop.Excel，缺点是需要安装excel，不支持.net core

private static bool ExcelToPdfWithExcel(string excelFile, string pdfFile)
        {
            Microsoft.Office.Interop.Excel.Application application = null;
            Microsoft.Office.Interop.Excel.Workbooks workbooks = null;
            Microsoft.Office.Interop.Excel.Workbook workbook = null;
            try
            {
                application = new Microsoft.Office.Interop.Excel.Application();
                application.Visible = false;
                workbooks = application.Workbooks;
                workbook = workbooks.Open(excelFile, false, true);
                workbook.ExportAsFixedFormat(Microsoft.Office.Interop.Excel.XlFixedFormatType.xlTypePDF, pdfFile);
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (workbook != null)
                {
                    workbook.Close();
                    System.Runtime.InteropServices.Marshal.ReleaseComObject(workbook);
                    workbook = null;
                }
                if (workbooks != null)
                {
                    workbooks.Close();
                    System.Runtime.InteropServices.Marshal.ReleaseComObject(workbooks);
                    workbooks = null;
                }
                if (application != null)
                {
                    application.Quit();
                    System.Runtime.InteropServices.Marshal.ReleaseComObject(application);
                    application = null;
                }

                GC.Collect();
                GC.WaitForPendingFinalizers();
            }

            return true;
        }

方法2，调用FreeSpire.XLS，缺点是免费版只能转3页pdf

private static bool ExcelToPdfWithFreeSpire(string excelFile, string pdfFile)
        {
            try
            {
                Workbook workbook = new Workbook();
                workbook.LoadFromFile(excelFile);
                workbook.SaveToFile(pdfFile, Spire.Xls.FileFormat.PDF);

                //判断是否超过免费版限制，3页pdf
                PdfDocument pdfDocument = new PdfDocument(pdfFile);
                if (pdfDocument.Pages.Count > 3)
                {
                    pdfDocument.Close();
                    return false;
                }
            }
            catch (Exception ex)
            {
                return false;
            }

            return true;
        }

方法3，调用NPOI+iTextSharp，缺点是免费版iTextSharp(itext5)不支持.net core，目前最新版itext7已商用（未亲自试过）

https://blog.csdn.net/weixin_43663915/article/details/86599334

方法4，调用OpenOffice，缺点是服务器需要额外装OpenOffice、Java等，配置多，需要额外打开端口（未亲自试过）

https://blog.csdn.net/qq_37319035/article/details/79225024

方法5，调用WPS（未亲自试过）

https://blog.csdn.net/lqw_6/article/details/77941365