observablecollection

问题 I have a following class : [DataContract] public class Pair<TKey, TValue> : INotifyPropertyChanged, IDisposable { public Pair(TKey key, TValue value) { Key = key; Value = value; } #region Properties [DataMember] public TKey Key { get { return m_key; } set { m_key = value; OnPropertyChanged("Key"); } } [DataMember] public TValue Value { get { return m_value; } set { m_value = value; OnPropertyChanged("Value"); } } #endregion #region Fields private TKey m_key; private TValue m_value; #endregion

问题 I've got an ObservableCollection<A> a_collection; The collection contains 'n' items. Each item A looks like this: public class A : INotifyPropertyChanged { public ObservableCollection<B> b_subcollection; Thread m_worker; } Basically, it's all wired up to a WPF listview + a details view control which shows the b_subcollection of the selected item in a separate listview (2-way bindings, updates on propertychanged etc.). The problem showed up for me when I started to implement threading. The

问题 In an UWP app I'm trying to sort an ObservableCollection that is bound to a ListView - therefore collection.OrderBy(..) (which creates a new collection) is not an option. Until now I used this extension-method: public static void Sort<TSource, TKey>(this ObservableCollection<TSource> source, Func<TSource, TKey> keySelector) { List<TSource> sortedList = source.OrderBy(keySelector).ToList(); source.Clear(); foreach (var sortedItem in sortedList) { source.Add(sortedItem); } } Unfortunately this

问题 In my program I have a UserControl that contains a TreeView . That TreeView has a ViewModel and a Model relating to it. I would like to make it so that by clicking buttons, I can shift nodes up and down throughout the tree. This is similar to what one might implement on a listBox . As a guide, I am using this article. I am implementing the following functions into the code-behind of the UserControl for which the TreeView exists. //Move up private void moveUp_Click(object sender,

问题 I have a ComboBox which has its ItemsSource bound to an ObservableCollection<CustomObject> where CustomObject has a few properties. Sample class: public class CustomObject : INotifyPropertyChanged { public string Property1 { /*...omitted for brevity...*/ } public string Property2 { /*...omitted for brevity...*/ } public string Property3 { /*...omitted for brevity...*/ } } The SelectedItem property of my ComboBox is bound to a CustomObject property which appears in a DataGrid row. Sample class

问题 I try to add strings that are in a string array to an ObservableCollection. The way i do it is: In my constructor i instantiate the collection and add the eventhandler to call my method that adds the strings from the array to the list: public CLoggerViewModel() { this._currenLogContent = new ObservableCollection<string>(); this._memoryAppender.LogContentChanged += new LoggingEventHandler(OnLogContentChanged); } In the eventhandler i want to iterate through the string array and add each string

问题 I have a simple MVVM project I am learning on. I am trying to add to an ObservableCollection through an ICommand command, but I am unable to? MainWindow.cs I haven't added anything* <Window x:Class="WpfApplication1.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:Local="clr-namespace:WpfApplication1" Title="MainWindow" Height="350" Width="525"> <Grid> <Grid.DataContext> <Local:ViewModel></Local:ViewModel

问题 I'm trying to use scala.collection.mutable.ObservableMap. I grabbed the snippet below from scala-user and copied it to the REPL. The email mentions ticket 2704 which has been marked as fixed but this snippet does not work. So has the syntax changed or is subscribe being called incorrectly? This is on 2.9.0.final scala> import scala.collection.mutable._ import scala.collection.mutable._ scala> import scala.collection.script._ import scala.collection.script._ scala> class MyMap extends HashMap

问题 i found a piece of code that use ObservableCollection but they can use list or any other collection related classes. can anyone tell me what is the benifit of using ObservableCollection. ObservableCollection<Employee> empData = new ObservableCollection<Employee> { new Employee{Name="Diptimaya Patra", Contact="0000", EmailID="diptimaya.patra@some.com", Country="India"}, new Employee{Name="Dhananjay Kumar", Contact="00020", EmailID="dhananjay.kumar@some.com", Country="India"}, new Employee{Name

问题 I am adding to an observablecollection in an alternate thread and this collection is bound to a datagrid from the wpftoolkit. The oncollectionchanged is invoking through the main gui thread when such an event occurs. The problem I am seeing is that most of the time the application will throw: System.ArgumentOutOfRangeException was unhandled Message=Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index Source=mscorlib ParamName=index