![]() Private void OnPropertåhanged() => this.Propertåhanged?.Invoke(this, new PropertåhangedEventArgs(nameof(this. My app needs to check a remote resource for new additions and when these arrive, update the GUI and store the items in a database. I have an ObservableCollection in my ViewModel which is being used by a Datagrid. => this.CollectionChanged?.Invoke(this, new NotifåollectionChangedEventArgs(NotifåollectionChangedAction.Reset)) Im building a WPF application according to MVVM. => this.CollectionChanged?.Invoke(this, new NotifåollectionChangedEventArgs(action, item, index)) Private void OnCollectionChanged(NotifåollectionChangedAction action, TItem item, int index) OnCollectionChanged(NotifåollectionChangedAction.Remove, result, 0) New public bool TryDequeue(out TItem? result) OnCollectionChanged(NotifåollectionChangedAction.Remove, removedItem, 0) I want the queue to process it FIFO once its in there. So if I have an order, say ID 001, and it has two different products, I would like to show this on a DataGrid, where the order ID is repeated by the number of products in the record. ObservableCollection orderItems new ObservableCollection () //and at the right event (key enter is pressed) the orderItem object is added to the orderItems orderItems.The user search for something and they click on the results that they want to add to the queue. Lets say I have a collection called Orders, and one of the members in the collection, is another collection called Products. I want to implement a queue that the app can add to it a file path to a file to process. Generic Namespace Understanding Collection Initialization Syntax Working with the List Class Working with the Stack Class Working with the Queue.OnCollectionChanged(NotifåollectionChangedAction.Add, item, this.Count - 1) I am new to WPF and I need some help on this problem that I am facing. Public event NotifåollectionChangedEventHandler? CollectionChanged Public event PropertåhangedEventHandler? Propertåhanged When I remove them, the items in the ObservableCollection that is binded to the DataGrid are removed correctly but they still appear in the DataGrid. You can use the following implementation: public class ObservableQueue : Queue, INotifåollectionChanged, INotifyPropertåhanged Im struggling to get the datagrid updated when I remove items from my ObservableCollection. You can extend Queue to add collection changed notifications. This makes using a native Queue the better option. The complexity of Queue.Dequeue is O(1) where Collection.RemoveAt is O(n). If (!(commandParameter is ModularPacket packet))įoreach (FileTransferModel transfer in (packet)) Is my best/only option just to use the ObservableCollection like a Queue, such as removing the first item after a file transfer is complete? public async void ExecuteRequestDownloadCommand(object commandParameter) I have a ListView control which has the source set to what is currently the Queue, and after doing Enqueue() the UI does not update. ![]() The problem here is the fact that unlike ObservableCollection, it does not automatically reflect the changes in the UI. ![]() The first choice would be to use a Queue. The user can add as many file transfers (both download/upload), and those will go in FIFO order. ![]()
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