获取类型的形状下拉列表

这是我想改进的一些可怕的代码：

Excel.Shapes theShapes = excelSheet.Shapes;
foreach (Excel.Shape aShape in theShapes)
{    
    foreach (var groupItem in aShape.GroupItems)
    {
        //Console.WriteLine(Microsoft.VisualBasic.Information.TypeName(groupItem));       
        var s = (Excel.Shape) groupItem;
        if (s is Excel.OLEObject) continue;
        try
        {
            if (s.FormControlType == Excel.XlFormControl.xlDropDown)
            {
                Console.WriteLine("### " + s.Name);
            }
        }
        catch (Exception e)
        {
        }
    }
}

有没有一种方法可以更容易地获得下拉列表？当我尝试获取FormControlType时，如何避免上述异常？

Excel.Shapes theShapes = excelSheet.Shapes;
foreach (Excel.Shape aShape in theShapes)
{    
    foreach (var groupItem in aShape.GroupItems)
    {
        var s = (Excel.Shape) groupItem;
        if (s is Excel.OLEObject) continue;
        if (s.Type == Microsoft.Office.Core.MsoShapeType.msoFormControl)
        {
           if (s.FormControlType == Excel.XlFormControl.xlDropDown)
           {
               Console.WriteLine("### " + s.Name);
           }
        }
    }
}