inotifycollectionchanged

问题 I have this object wrapper, whose instances I populate the collection with: public class Multimedia : INotifyPropertyChanged { //... constructor //... getters and setters for the properties public void OnCollectionChanged(object sender, NotifyCollectionChangedEventArgs e) { ObservableCollection<Multimedia> objSender = sender as ObservableCollection<Multimedia>; NotifyCollectionChangedAction action = e.Action; } } The collection: public class MultiMediaList : ObservableCollection<Multimedia> {

问题 I have a class as shown below. All the functions I have removed for brevity public class PersonCollection:IList<Person> {} Now I have one more Model class as shown below. AddValueCommand is class deriving from ICommand which again I am omiting. public class DataContextClass:INotifyCollectionChanged { private PersonCollection personCollection = PersonCollection.GetInstance(); public IList<Person> ListOfPerson { get { return personCollection; } } public void AddPerson(Person person) {

问题 I have a class as shown below. All the functions I have removed for brevity public class PersonCollection:IList<Person> {} Now I have one more Model class as shown below. AddValueCommand is class deriving from ICommand which again I am omiting. public class DataContextClass:INotifyCollectionChanged { private PersonCollection personCollection = PersonCollection.GetInstance(); public IList<Person> ListOfPerson { get { return personCollection; } } public void AddPerson(Person person) {

问题 Hi i am having some troube with DataTables. So What i need is to detect whenever i change any cell in the DataGrid of the DataTable that is binded. How to do it? With INotifyPropertyChanged or with INotifyCollectionChanged ? Note: I am trying with INotifyPropertyChanged but it only detects when i set some value in the DataTable, and never when i change any value of any cell in the DataGrid, i already have tried OneWay and TwoWay but nothing happens. Thanks in advance! 回答1: The datagrid would

问题 I observe an odd behaviour of WPF ItemsControls: If a set the ItemsSource to an object which implements INotifyCollectionChanged and after that set the ItemsSource to null, the CollectionView which was created to provide the data to the ItemsControl still listens to the CollectionChanged -event of the source object. If now the source collection is changed through a different thread, the CollectionView throws an exception (without being attached to any control). While I understand why this is

问题 I have a ListView that is databound to an ObservableCollection ... <ListView x:Name="List1" ItemsSource="{Binding MyList}" /> I can't seem to find any event that are triggered when the collection changes, so I'm thinking that somehow I need to hook into the collectionchanged notification somehow? I'm not really sure how to do that. Basically, when the collection changes I want to do additional work beyond what the ListView already does in updating it's list. 回答1: By default the ItemsSource is

问题 All, I have some test code that works with some test data defined as private ObservableCollection<TestClass> _testData = new ObservableCollection<TestClass>(); public ObservableCollection<TestClass> TestData { get { return _testData; } set { _testData = value; } } and is bound at design-time via <DataGrid x:Name="dataGrid" ItemsSource="{Binding TestData}".../> I have created a DataGrid which gets populated at run-time via dataGrid.ItemsSource = BuildDataGridColumns(cultureDict).Tables[0]

问题 I was just looking into the difference between BindingList and ObservableCollection following this question: Why NOT BindingList in WPF As part of this, I tested binding the ItemsSource of an ItemsControl to various types, including List, Collection, ObservableCollection and BindingList. What surprised me is that the interface updated when either the ObservableCollection or the BindingList were modified, but not when the others were. So what is WPF listening to that causes that update? It can

问题 I use DataContract with ObservableCollection: [DataContract(Namespace = Terms.MyNamespace)] public class MyContract { internal MyContract () { List = new ObservableCollection<string>(); } [DataMember] private ObservableCollection<string> list; [XmlArray("list")] public ObservableCollection<string> List { get { return list; } set { list = value; list.CollectionChanged += (s, e) => { Console.WriteLine("It is never happens!! Why?"); }; } } ... So, when I work with my collection like this.

问题 I am trying to bind observable collection to DataGrid, i want to notify when any row is edited in datagrid. My code works fine for notifing when record is added or removed but its not notifing when record is edited. Please let me know if this is the right way of binding using observable collection in MVVM and whether i am missing someting. Thanks in advance. public class studentViewModel : INotifyPropertyChanged { #region constructor public studentViewModel() { _student = new studentModel();