using BF = System.Reflection.BindingFlags;

namespace ExcelLateBinding
{
    public static class LateBindings
    {
        public static object GetInstance(string appName)
        {
            return System.Runtime.InteropServices.Marshal.GetActiveObject(appName);
        }

        public static object CreateInstance(string appName)
        {
            return System.Activator.CreateInstance(System.Type.GetTypeFromProgID(appName));
        }

        public static object GetOrCreateInstance(string appName)
        {
            try { return GetInstance(appName); }
            catch { return CreateInstance(appName); }
        }

        public static object Get(object obj, string propName)
        {
            return Get(obj, propName, null);
        }

        public static object Get(object obj, string propName, object parameter)
        {
            return Get(obj, propName, new object[1] { parameter });
        }

        public static object Get(object obj, string propName, object[] parameter)
        {
            return obj.GetType().InvokeMember(propName, BF.GetProperty, null, obj, parameter);
        }

        public static void Set(object obj, string propName, object parameter)
        {
            Set(obj, propName, new object[1] { parameter });
        }

        public static void Set(object obj, string propName, object[] parameter)
        {
            obj.GetType().InvokeMember(propName, BF.SetProperty, null, obj, parameter);
        }

        public static object Invoke(object obj, string methName)
        {
            return Invoke(obj, methName, null);
        }

        public static object Invoke(object obj, string methName, object parameter)
        {
            return Invoke(obj, methName, new object[1] { parameter });
        }

        public static object Invoke(object obj, string methName, object[] parameter)
        {
            return obj.GetType().InvokeMember(methName, BF.InvokeMethod, null, obj, parameter);
        }

        public static void ReleaseInstance(object obj)
        {
            System.Runtime.InteropServices.Marshal.ReleaseComObject(obj);
        }
    }
}