Writing and Executing VBA Macros on Excel without using Excel.Interop [duplicate]

Answer 1

I realise this question is a bit old, but in the interest of helping future visitors I'll add that the current version of EPPlus (4.0.4 at time of writing) supports the inclusion of VBA.

Where excelDoc is your ExcelPackage, you can drop it in using something along the lines of:

excelDoc.Workbook.CreateVBAProject();

StringBuilder vbaCode = new StringBuilder();

vbaCode.AppendLine("Private Sub Workbook_Open()");
vbaCode.AppendLine("    Application.DisplayFormulaBar = False");
vbaCode.AppendLine("End Sub");

excelDoc.Workbook.CodeModule.Code = vbaCode.ToString();

Hope this helps.

Answer 2

Rather than attempting to programatically write macros to an xlsm file, why don't you create a template that already contains the macros you want. Then generate your reports from this template.

When a user opens the report (and allows macros to run), then your macro will run and do the manipultations you want (your option A). Your Auto_Open macro could check some suitable condition (e.g. presence of a value in a specific location, perhaps on a VeryHidden sheet so the user can't easily interfere with it) before doing any work, so that it doesn't run when you open an "empty" template.

As for your option B (run the macro before providing the report to the user): this isn't feasible without Excel Automation.

Answer 3

1. Open Excel
2. Press Alt+F11

You will now be in the VBA IDE.

To run something on Auto Open:

1. Select ThisWorkbook From the VBAProject in Project Explorer on the Left of your screen

2. There are Two drop downs near the top of the window one will say (General) and The other (Declarations) click on (General) and select workbook

Excel should automatically bring you to the Open declaration.

Anything written in this sub will execute on open.