It doesn’t claim to include the old items, because Reset doesn’t mean that the list has been cleared It means that some dramatic thing has taken place, and the cost of working out the add/removes would most likely exceed the cost of just re-scanning the list from scratch… so that’s what you should do. MSDN … Read more
This simple extension worked beautifully for me. I just had to make sure that MyObject was IComparable. When the sort method is called on the observable collection of MyObjects, the CompareTo method on MyObject is called, which calls my Logical Sort method. While it doesn’t have all the bells and whistles of the rest of … Read more
Please refer to the updated and optimized C# 7 version. I didn’t want to remove the VB.NET version so I just posted it in a separate answer. Go to updated version Seems it’s not supported, I implemented by myself, FYI, hope it to be helpful: I updated the VB version and from now on it … Read more
Here is a drop-in class that sub-classes ObservableCollection and actually raises a Reset action when a property on a list item changes. It enforces all items to implement INotifyPropertyChanged. The benefit here is that you can data bind to this class and all of your bindings will update with changes to your item properties. public … Read more
ObservableCollection is a collection that allows code outside the collection be aware of when changes to the collection (add, move, remove) occur. It is used heavily in WPF and Silverlight but its use is not limited to there. Code can add event handlers to see when the collection has changed and then react through the … Read more
An ObservableCollection can be updated from UI exactly like any collection. The true difference is rather straightforward: ObservableCollection<T> implements INotifyCollectionChanged which provides notification when the collection is changed (you guessed ^^) It allows the binding engine to update the UI when the ObservableCollection is updated. However, BindingList<T> implements IBindingList. IBindingList provides notification on collection changes, … Read more