System.Windows.Forms.ListBindingHelper.GetListItemPropertiesByEnumerable C# (CSharp) Method

        private static PropertyDescriptorCollection GetListItemPropertiesByEnumerable(IEnumerable enumerable) {
            PropertyDescriptorCollection pdc = null;
            Type targetType = enumerable.GetType();

            if (typeof(Array).IsAssignableFrom(targetType)) {
                pdc = TypeDescriptor.GetProperties(targetType.GetElementType(), BrowsableAttributeList);
            }
            else {
                ITypedList typedListEnumerable = enumerable as ITypedList;
                if (typedListEnumerable != null) {
                    pdc = typedListEnumerable.GetItemProperties(null);
                }
                else {
                    PropertyInfo indexer = GetTypedIndexer(targetType);

                    if (indexer != null && !typeof(ICustomTypeDescriptor).IsAssignableFrom(indexer.PropertyType)) {
                        Type type = indexer.PropertyType;
                        pdc = TypeDescriptor.GetProperties(type, BrowsableAttributeList);

                        // Reflection, and consequently TypeDescriptor would not return properties defined on the "base" interface,
                        // for example
                        // public interface IPerson {String FirstName { get; set; }}
                        // public interface ITeacher : IPerson {int ClassRoom { get; set; }}
                        // typeof (ITeacher).GetProperties() would return only the "ClassRoom" property

                        // DevDiv2 518025   
                        // if (type.IsInterface) {
                        //     Type[] interfaces = type.GetInterfaces();
                        //    // initialize the list to an arbitrary length greater than pdc.Count
                        //     List<PropertyDescriptor> merged = new List<PropertyDescriptor>(pdc.Count * 2 + 1);
                        //     foreach (Type baseInterface in interfaces) {
                        //         PropertyDescriptorCollection props = TypeDescriptor.GetProperties(baseInterface, BrowsableAttributeList);
                        //         if (props != null) {
                        //             foreach (PropertyDescriptor p in props) {
                        //                 merged.Add(p);
                        //             }
                        //         }
                        //     }
                        //     if (merged.Count != 0) {
                        //         PropertyDescriptor[] props = new PropertyDescriptor[pdc.Count];
                        //         pdc.CopyTo(props, 0);
                        //         merged.AddRange(props);
                        //         pdc = new PropertyDescriptorCollection(merged.ToArray());
                        //     }
                        // }

                    }
                }
            }

            // See if we were successful - if not, return the shape of the first
            // item in the list
            if (null == pdc) {
                object instance = GetFirstItemByEnumerable(enumerable);
                if (enumerable is string) {
                    pdc = TypeDescriptor.GetProperties(enumerable, BrowsableAttributeList);
                }
                else if (instance == null) {
                    pdc = new PropertyDescriptorCollection(null);
                } 
                else {
                    pdc = TypeDescriptor.GetProperties(instance, BrowsableAttributeList);

                    if (!(enumerable is IList) && (pdc == null || pdc.Count == 0)) {
                        pdc = TypeDescriptor.GetProperties(enumerable, BrowsableAttributeList);
                    }
                }
                
            }

            // Return results
            return pdc;
        }