How to restore a minimized excel programmatically in c#

Question

I want to activate or make it visible(restore) of an existing open/minimized excel using a button click to avoid user open in another new instance.

For example, an workbook_A was minimized, the user click a button and the workbook_A will restored as usual instead of open in another new instance.

I tried to use below codes:

Excel.Application oExcelApp;
this.Activate();
oExcelApp =     (Excel.Application)System.Runtime.InteropServices.Marshal.GetActiveObject("Excel.Application");
oExcelApp.Visible = true;

But it's only open the empty excel.application, any idea how can I restore back my opened excel?

Please advice.. Thanks

Answer 1

Just simply go through workbooks collection and make their window state = maximaze like that

foreach (Excel.Workbook item in oExcelApp.Workbooks)
{
  item.Windows[1].WindowState = Excel.XlWindowState.xlMaximized;
}