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Ignore Failing Macro when Opening Excel File with C# Interop

I have been asked to write a script to crawl through a load of folder locations and list out all the Excel spreadsheets that have connections to a set of SQL and other data sources that are due to be upgraded to a new server.
In order to do this, I need to open each file, then check the connections and return those that match the criterion set. All this happens fine until I hit any file where the end user has made a macro to run on open that refers to a non-existent file - As the C# script opens the file, the file presents the following message:
If I manually click "End", the script moves on to the next file and all is ok, but I would much rather avoid any user input and record the fact that there was a problem with the macro... How would I go about doing that?
I have set the Excel property "Disable all macros without notification" to true on the computer that will be running the script, using the same username as will run it, which I thought would prevent this kind of thing happening. I also open Excel with DisplayAlerts=false, so that isn't the problem...
I don't need to run the macro at all and would rather not..!
for context, the code snippet that opens each file looks like this:
var app = new Application
{
Visible = false,
DisplayAlerts = false,
ScreenUpdating = false
};
Workbook thisFile = null;
try
{
//send a false password to stop Excel asking for one - when it is wrong, the error will be caught.
thisFile = app.Workbooks.Open(file.FullName, ReadOnly: true, Password: "FakePassword");
foreach (WorkbookConnection connection in thisFile.Connections)
{
EDIT: It occurs to me that maybe I could do something with a timeout..? If there were some way to close the popup box from the script, that would do the job - I could just record that the timer expired in the output, which would be enough. So... alternatively is there a way to just close the box after it has popped up?

I have been able to disable startup macros when I open the workbook by holding down shift when opening the file.
I believe the interop way to handle this is to use the application AutomationSecurity property:
Excel.Application app = new Excel.Application();
app.Visible = true;
app.AutomationSecurity = Microsoft.Office.Core.MsoAutomationSecurity.msoAutomationSecurityForceDisable;
I tested this on a simple workbook that popped up a message box and put the current time in A1, and it seemed to work properly.
Excel.Workbook wb = app.Workbooks.Open("c:/cdh/foot.xlsm");
Default, the message box popped up and A1 had a value, and when I set it to disable neither happened.

I cannot use the formula from external addins(ex. bloomberg) when i open excel with (C#)

I have to use the data from third-party DB.
and they provide us excel format with addins, when i open the excel, then i can see the data after few seconds( just like bloomberg).
NORMAL_OPEN_Without_C#
But_like_this_TT
and now i want to use this data automatically but they don't have api provide.
so i try to open the excel with C# programming ,and save&quit the file after few minutes later.
but i cannot see the ribbon menu when i open the file with C# program, the result of the formula also does not work .
a.cs
Application app = new Application();
app.Visible = true;
Workbook wb = app.Workbooks.Open(Filename: #"C:\nn\a.xlsx");
Console.ReadLine();
wb.Save();
wb.Close();
app.Quit();
i want to know the way to have the result of formula from external-addins.
if there is another way to have the result plz. let me know TT
thanks.

Save Excel as PDF

I open an Excel file in c#, make some changes and I want to save it as pdf file.
I have searched about it and find this:
Microsoft.Office.Interop.Excel._Workbook oWB;
oWB.ExportAsFixedFormat(XlFixedFormatType.xlTypePDF, "D:\\xxxxx.pdf");
but this code sometimes opens a form and a printer must be selected! I don't know why?!
Is there any other way for exporting PDF from Excel?
I saw that Workbook.saveas() has a Fileformat object. How can we use it?

Check out Spire.Xls, below is the code for converting Excel to PDF.
Workbook workbook = new Workbook();
workbook.LoadFromFile("Sample.xlsx");
//If you want to make the excel content fit to pdf page
//workbook.ConverterSetting.SheetFitToPage = true;
workbook.SaveToFile("result.pdf", Spire.Xls.FileFormat.PDF);
It has a free version which you can use without charge:
https://www.e-iceblue.com/Introduce/free-xls-component.html (Also available on NuGet)

Use iTextSharp. It is native .NET code. Doesn't require any Excel interop -
https://www.nuget.org/packages/itextsharp/

If you're looking for an alternative approach, then check out GemBox.Spreadsheet:
https://www.nuget.org/packages/GemBox.Spreadsheet/
Here is how you can save Excel to PDF with it:
ExcelFile excel = ExcelFile.Load("D:\\xxxxx.xlsx");
excel.Save("D:\\xxxxx.pdf");
Or you can write it as following:
XlsxLoadOptions loadOptions = new XlsxLoadOptions();
ExcelFile excel = ExcelFile.Load("D:\\xxxxx.xlsx", loadOptions);
PdfSaveOptions saveOptions = new PdfSaveOptions();
excel.Save("D:\\xxxxx.pdf", saveOptions);

You can do this using this API. Please see documentation for further detail.
http://cdn.bytescout.com/help/BytescoutPDFExtractorSDK/html/55590148-5bef-4338-ac16-1de4056a952b.htm

SpreadsheetGear.Factory.GetWorkbook(filename) replacing empty value with 0 in excel file

I have DevEx gridControl with some data from DB.
gridControl.ExportToXlsx(filename, new XlsxExportOptions(TextExportMode.Value));
this code block Works fine and export data to excel. after export, I am opening and closing excel file using SpreadsheetGear like below...
WorkBook = Factory.GetWorkbook(filename);
WorkBook.Save();
WorkBook.Close();
My intention is to perform some task after opening excel file but This opening and closing of excel file replacing all empty values in excel file with 0 (zero).
Can anyone help me to understand why this is happening and how can I fix this.
one more point to add, if I export data with TextExportMode.Text option then SpreadsheetGear is not replacing empty values with 0 but exporting as Text will not solve my purpose.
Thanks in advance.

Extracting Excel workbook name before it actually opens

I am trying to get the name of the workbook before it actually opens up.
((Excel.AppEvents_Event)this.Application).WorkbookOpen += new Excel.AppEvents_WorkbookOpenEventHandler(App_WorkBookOpen);
private void App_WorkBookOpen(Excel.Workbook Wb)
{
System.Windows.Forms.MessageBox.Show("Shakti " + " " + Wb.Name);
}
With the handler as shown above, Excel application shows the workbook name when it is opened completely.My intention is to do some formal check before it is actually opened up and data is shown to the user.
Is there any way or mechanism to extract the file name before the contents are loaded on to Excel and shown to the user? Any sort of help is highly appreciated.Thanks.

AFAIK you can't do that. But like I mentioned in my comment you could hide the workbook the moment it is visible. So the user will see the workbook open for a split second and then go invisible. In that split second you can read the name of the workbook and then hide the workbook.
Based on your calculations/conclusion you can then close/unhide the workbook as required.
You can hide the workbook using
Wb.Windows[1].Visible = false;

No you can't.
You anyway could create a Macro on a WorkBook Module with Open class tag as here:
Private Sub Workbook_Open()
Dim ws As Workbooks
For Each ws In ActiveWorkbook.Worksheets
MsgBox ws.Name
Next
ActiveWorkbook.Worksheets.Close
End Sub
Then call this sub via c# on opening the file, this sub runs before loading the workbook then it closes it. It has not that sense, because you'll never access the wb again...
Maybe with some tweaking here and there you could accomplish your task, but it depends to you.
Hope it helps...

Isn't Wb.name the same as the filename? In which case, since you must know the filename/location in order to open it, you can check it beforehand?