[Small suggestion] VirtualDataCollection.LoadItems() should check, if list already contains same sequence

[Vitalii]

For example, if collection is inherited IEnumerable, then check SequenceEqual().

In my case, i'm facing with next problem: i'm reading, say, 3rd page from cache, and i'm sending server request for 3rd page (in case, server holds updated version). When getting answer, i do VirtualDataCollection.LoadItems(), that leads to screen blinking in all cases, even if elements are similar.

[Deyan]

Hi Vitalii,

Thanks for your suggestion.

According to MSDN SequenceEqual is not supported on Windows Phone:

http://msdn.microsoft.com/en-us/library/bb348567.aspx

Regards,
Deyan
Telerik

[Vitalii]

Wut.. but i'm using it :)
Hm, i'll re-check - maybe msdn is just outdated.

[Vitalii]

Just re-checked, it works fine

case AnswerDataServiceStatus.Ok:
                        status = string.Empty;

                        collectionsAnswer.Collections[0].name = "haha"; // Custom name (it is shown in the screen)
                        collectionsAnswer.Collections[0].id = "3"; // Custom id (it is used in Equals())

                        if ((_itemsList == null)
                            || !(_itemsList.SequenceEqual(collectionsAnswer.Collections))) // if not equal, update
                        {
                            _itemsList = new List<ProductSubCategoryItem>(collectionsAnswer.Collections);

                            DispatcherHelper.CheckBeginInvokeOnUI(() =>
                                RaisePropertyChanged("ItemsList", _itemsList, _itemsList, true));
                        }

                        break;

[Deyan]

Hi Vitalii,

We will revisit this functionality and will update the component accordingly.

We will consider this thread closed for now.

Let us know should you have further questions or need assistance.

Regards,
Deyan
Telerik