inotifypropertychanged

问题 I have a textbox which is bound to an Int property in my viewmodel which gets a count of an ObservableCollection . Here is my Xaml binding: Text="{Binding ArticleCount, Mode=OneWay}" And my int property: private Int32 _ArticleCount; public int ArticleCount { get { if (this.ModelviewArticleObservableList == null) { return 0; } else { return this.ModelviewArticleObservableList.Count; } } } This works fine on application initialisation and I get the ObservableCollection count in my UI TextBox .

问题 I'm writing a few classes and I want to make them all "data-binding compliant" (for WPF, or even the probably rarer WinForms) by implementing INotifyPropertyChanged. The issue is the repeated code. I actually copy-paste the same method over and over again (I'm not joking). protected void OnPropertyChanged([CallerMemberName] String propertyName = null) { if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); } I had this issue for a while but today

问题 I'm writing a few classes and I want to make them all "data-binding compliant" (for WPF, or even the probably rarer WinForms) by implementing INotifyPropertyChanged. The issue is the repeated code. I actually copy-paste the same method over and over again (I'm not joking). protected void OnPropertyChanged([CallerMemberName] String propertyName = null) { if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); } I had this issue for a while but today

问题 I'm trying to bind a static property of some class to some control. I've tryied a few implementation but each has its problem: All examples use the next XAML: <Label Name="label1" Content="{Binding Path=text}"/> 1st approach - don't use INotifyPropertyChanged public class foo1 { public static string text { get; set; } } The problem is that when 'text' propery changes the control is not notified. Second approach - use INotifyPropertyChanged public class foo1 : INotifyPropertyChanged { public

问题 The MSDN reference page for ObservableCollection<T> notes: "The objects in your collection must satisfy the requirements described in the Binding Sources Overview. In particular, if you are using OneWay or TwoWay (for example, you want your UI to update when the source properties change dynamically), you must implement a suitable property changed notification mechanism such as the INotifyPropertyChanged interface." Since ObservableCollection<T> already implements INotifyPropertyChanged , why

问题 The MSDN reference page for ObservableCollection<T> notes: "The objects in your collection must satisfy the requirements described in the Binding Sources Overview. In particular, if you are using OneWay or TwoWay (for example, you want your UI to update when the source properties change dynamically), you must implement a suitable property changed notification mechanism such as the INotifyPropertyChanged interface." Since ObservableCollection<T> already implements INotifyPropertyChanged , why

问题 I have a Person class: public class Person : INotifyPropertyChanged { private string _name; public string Name{ get { return _name; } set { if ( _name != value ) { _name = value; OnPropertyChanged( "Name" ); } } private Address _primaryAddress; public Address PrimaryAddress { get { return _primaryAddress; } set { if ( _primaryAddress != value ) { _primaryAddress = value; OnPropertyChanged( "PrimaryAddress" ); } } //OnPropertyChanged code goes here } I have an Address class: public class

问题 I'm simply creating a Observable collection in Background and binding to it. All objects inherit from INotifyPropertyChanged. but nevertheless the Memory consumption is continuously raising. The following Objects instances are continuously raising WeakReference FrugalObjectList<WeakEventManager+Listener> ConditionalWeakTable<TKey, TValue>+Entry<Object, Object>[] WeakEventTable+EventKey ConditionalWeakTable<Object, Object> SingleItemList<WeakEventManager+Listener> Object Int32[]

问题 I have a ListView that display a list of CheckBoxes XAML below. The Checkbox is a custom class, the code is below. The initial state of the Checkbox is set correctly. However, when the Checkbox is clicked, it should become disabled (IsEnabled = False), but this doesn't happen, despite having implemented INotify code, shown below, in the custom class (although, I suspect the error is here somewhere, or the XAML markup is wrong). I have even tried to force a binding update on the Click event,

问题 In .NET 4.0, there isn't a single property defined by ObservableCollection<T> nor does it override any property of its parent or interfaces. So why does ObservableCollection<T> implement INotifyPropertyChanged ? One reason I can think of is that it makes it easier for subclasses to define their own properties and use the OnPropertyChanged method implemented by ObservableCollection<T> . But is this the main reason? 回答1: Of the properties Item , Items and Count , only Item actually has a setter