inotifypropertychanged

问题 I have two ComboBoxes, A & B, each bound to an Observable Collection. Each has a SelectionChanged trigger is attached which is intended to catch when the user changes a selection. The trigger passes the selection to a Command. The collections implement INotifyPropertyChanged in that, in the Setter of each, an NotifyPropertyChanged event is fired. This is needed (in the MVVM approach) to notify the UI (the View) that the ComboBox's contents have changed. The two ComboBoxes are interdependent -

问题 I have: public class Vm { private ObservableCollection<Thing> _things; public ObservableCollection<Thing> Things { get { return _things ?? (_things = new ObservableCollection<Thing>()); } } } And public class Thing :INotifyPropertyChanged { private string _value; public string Value { get { return _value; } set { if (value == _value) return; _value = value; OnPropertyChanged(); } } public event PropertyChangedEventHandler PropertyChanged; [NotifyPropertyChangedInvocator] protected virtual

问题 I have: public class Vm { private ObservableCollection<Thing> _things; public ObservableCollection<Thing> Things { get { return _things ?? (_things = new ObservableCollection<Thing>()); } } } And public class Thing :INotifyPropertyChanged { private string _value; public string Value { get { return _value; } set { if (value == _value) return; _value = value; OnPropertyChanged(); } } public event PropertyChangedEventHandler PropertyChanged; [NotifyPropertyChangedInvocator] protected virtual

问题 I have the INotifyPropertyChanged implemented using CallerMemberName public event PropertyChangedEventHandler PropertyChanged; protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null) { if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); } } So this could be called in the setter of any property as - OnPropertyChanged() which would notify property changed event whenever it is being set. This is not the case for a

问题 I have found an implementation of Propperty Changed Event, where i can Call Property changed without the Name of the Property in the web. And then i have build a Extension Method with it wich is here public static void OnPropertyChanged(this INotifyPropertyChanged iNotifyPropertyChanged, string propertyName = null) { if (propertyName == null) propertyName = new StackTrace().GetFrame(1).GetMethod().Name.Replace("set_", ""); FieldInfo field = iNotifyPropertyChanged.GetType().GetField(

问题 There have been plenty of articles about how to use reflection and LINQ to raise PropertyChanged events in a type-safe way, without using strings. But is there any way to consume PropertyChanged events in a type-safe manner? Currently, I'm doing this void model_PropertyChanged(object sender, PropertyChangedEventArgs e) { switch (e.PropertyName) { case "Property1": ... case "Property2": ... .... } } Is there any way to avoid hard-coding strings in a switch statement to handle the different

问题 I am trying to understand how to update the UI if I have a read-only property that is dependent on another property, so that changes to one property update both UI elements (in this case a textbox and a read-only textbox. For example: public class raz : INotifyPropertyChanged { int _foo; public int foo { get { return _foo; } set { _foo = value; onPropertyChanged(this, "foo"); } } public int bar { get { return foo*foo; } } public raz() { } public event PropertyChangedEventHandler

问题 Winforms .net 3.5 app. In my app I have a generic class that looks like so: public class FilterItem { public FilterItem() { } public string FilterProperty { get; set; } public bool FilterPropertyChecked { get; set; } public ComparitiveOperator FilterOperator { get; set; } public string FilterValue { get; set; } } and I use it in all of my dialog boxes when I want to implement some sort of filter functionality. So I call the dialog form with a pre-poulated List<FilterItem> passed in the

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 Suppose I have simple class Order, that have a TotalPrice calculated property, which can be bound to WPF UI public class Order : INotifyPropertyChanged { public decimal ItemPrice { get { return this.itemPrice; } set { this.itemPrice = value; this.RaisePropertyChanged("ItemPrice"); this.RaisePropertyChanged("TotalPrice"); } } public int Quantity { get { return this.quantity; } set { this.quantity= value; this.RaisePropertyChanged("Quantity"); this.RaisePropertyChanged("TotalPrice"); } } public