NotifåollectionChangedAction.Replace, sender, sender, this.Items. NotifåollectionChangedEventArgs arg = new NotifåollectionChangedEventArgs( If (sortDescription.PropertyName = e.PropertyName) Private void OnItemPropertåhanged(object sender, PropertåhangedEventArgs e)įoreach (SortDescription sortDescription in _view.SortDescriptions) Obj.Propertåhanged -= OnItemPropertåhanged Private void RemovePropertåhanged(IEnumerable items) Obj.Propertåhanged += OnItemPropertåhanged For example, you can use the Queue class from the queue module as a thread-safe FIFO queue: However, you could use a regular list as a FIFO queue as well. It stores objects in a first in first out (FIFO) manner. Private void AddPropertåhanged(IEnumerable items) In Python, a FIFO queue is a linear data structure. This is especially useful for UIs implemented using WPF, because esentially, when an object is. What makes ObservableCollection special is that it 'tells' observers when a new object is added or when an object is removed. Protected override void OnCollectionChanged(NotifåollectionChangedEventArgs e)Ĭase NotifåollectionChangedAction.Remove:Ĭase NotifåollectionChangedAction.Replace:Ĭase NotifåollectionChangedAction.Reset: The ObservableCollection class is a collection type (like List) which means that it holds objects of a given type T._(new SortDescription(propertyName, sortDirection)) Public void Sort(string propertyName, ListSortDirection sortDirection) _view = CollectionViewSource.GetDefaultView(this) public class MessageCollection : ObservableCollection I also added 'smart' sorting, that only Calls OnCollectionChanged() if the property changed is the value that's being currently used in SortDescription. ObservableCollection and Item Propertåhanged.ObservableCollection not noticing when Item in it changes (even with INotifyPropertåhanged).In the end, I combined the answers from these two threads: That user's solution was to manually call OnCollectionChanged(). It's the CollectionChanged event that forces re-sorting, but modifying an item that's already in the collection won't trigger this particular event, and hence no sorting will be performed.Ĭ# WPF Datagrid doesn't dynamically sort on data update It only deals with updating displayed data, but doesn't trigger sorting it. As you can see, the need here is to show in DataGrid a column that concatenates two properties of Address database entity: Street and Number, and giving that value to Address property of PersonViewModel class to show as a column in the DataGrid. INotifyPropertåhanged has no bearing on sorting updates. In other words, when you first add your item, it will be sorted and placed in the correct spot, but if you change a property of the item, it will not get re-sorted. You could actually use commands that fire the CRUD operations and events that notify of their success and modify the ObservableCollection even doing so with a service layer. It will not automatically re-sort the collection when underlying data changes. Well, that depends on the complexity of your implementation. So I did a bit more investigating, and it turns out my problem is due to limitation of WPF datagrid.
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