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Asked: 2026-06-02T17:42:28+00:00

I am creating an instance of Microsoft Excel in a .NET application (WPF if

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I am creating an instance of Microsoft Excel in a .NET application (WPF if it matters) and I am embedding it inside like this :

        var excelType = Type.GetTypeFromProgID("Excel.Application");
        var excelObj = Activator.CreateInstance(excelType);
        excelType.InvokeMember("Visible", BindingFlags.SetProperty, null, excelObj, new object[] { true }, ComCulture);
        var excelHwnd = new IntPtr((int)excelType.InvokeMember("Hwnd", BindingFlags.GetProperty, null, excelObj, new object[0], ComCulture));
        var managedWindowHwnd = new WindowInteropHelper(Application.Current.MainWindow).Handle;
        SetParent(excelHwnd, managedWindowHwnd);
        MoveWindow(excelHwnd, 0, 0, Convert.ToInt32(Width), Convert.ToInt32(Height), true);

All works except Excel does not load the add-ins installed. If I run Excel via the start menu it loads the add-ins.

I guess I need to specify some arguments to Excel to enable the add-ins loading. But I have no idea what/how…

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1 Answer

  1. Editorial Team

    you may do this manually using interop, you may refer to my post at Get the excel cell address from a UDF to get handle to excel’s Application object. Once you have application you can manually enable addins by looping through application.AddIns and and application.ComAddIns and seting installed/connect property to true for each item

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