inotifypropertychanged | 易学教程

How do I refresh visual control properties (TextBlock.text) set inside a loop?

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问题 With each loop iteration, I want to visually update the text of a textblock. My problem is that the WPF window or control does not visually refresh until the loop is complete. for (int i = 0; i < 50; i++) { System.Threading.Thread.Sleep(100); myTextBlock.Text = i.ToString(); } In VB6, I would call DoEvents() or control.Refresh . At the moment I'd just like a quick and dirty solution similar to DoEvents() , but I'd also like to know about alternatives or the "right" way to do this. Is there a

When nesting properties that implement INotifyPropertyChanged must the parent object propagate changes?

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问题 this question is going to show my lack of understanding of the expected behavior when implementing/using INotifyPropertyChanged: The question is - for binding to work as expected, when you have a class which itself implements INotifyPropertyChanged, that has nested properties of type INotifyPropertyChanged are you expected to internally subscribe to change notification for these properties and then propagate the notifications? Or is the binding infrastructure expected to have the smarts to

How to implement INotifyPropertyChanged in C# 6.0?

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The answer to this question has been edited to say that in C# 6.0, INotifyPropertyChanged can be implemented with the following OnPropertyChanged procedure: protected void OnPropertyChanged([CallerMemberName] string propertyName = null) { PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName)); } However, it isn't clear from that answer what the corresponding property definition should be. What does a complete implementation of INotifyPropertyChanged look like in C# 6.0 when this construction is used? After incorporating the various changes, the code will look like this. I've

When will the ValueConverter's Convert method be called in wpf

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问题 I have an ObservableCollection bound to a list box and a boolean property bound to a button . I then defined two converters , one that operates on the collection and the other operates on the boolean property. Whenever I modify the boolean property, the converter's Convert method is called, where as the same is not called if I modify the observable collection. What am I missing?? Snippets for your reference, xaml snipet, <Window.Resources> <local:WrapPanelWidthConverter x:Key=

BindableBase vs INotifyChanged

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问题 Does anyone know if BindableBase is still a viable or should we stick with INotifyChanged events? It seems like BindableBase has lost its luster quickly. Thanks for any info you can provide. 回答1: INotifyPropertyChanged The ViewModel should implement the INotifyPropertyChanged interface and should raise it whenever the propertychanges public class MyViewModel : INotifyPropertyChanged { private string _firstName; public event PropertyChangedEventHandler PropertyChanged; public string FirstName

Is there a good strongly typed way to do PropertyChanged events in C#?

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问题 It must be a somewhat common event to change the name of a property and expect the Rename functionality in Visual Studio to take care of all the necessary renaming, except for the property name of the PropertyChanged event of INotifyPropertyChanged. Is there a better way to somehow get it strongly typed so you don't need to remember to manually rename it? 回答1: Edit: nameof arrived in c# 6. Yay! There is no nameof / infoof etc; this is much discussed, but it is what it is. There is a way to do

Using INotifyPropertyChanged with Entity Framework 6 DbContext Generator

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问题 I know I can use ObjectContext instead, but I like the features of DbContext / DbSet. My application isn't large enough to warrant me writing complex view models, so I'd like to implement change notification on the EF generated models directly. How can I achieve this? 回答1: I've had great success using a NuGet package called PropertyChanged.Fody to get INPC implemented on the entity classes. Just install the package, then add the [ImplementPropertyChanged] attribute to any class and

INotifyPropertyChanged WPF

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What is the purpose of INotifyPropertyChanged. I know this event is fired whenever a property is changed but how can the View/UI knows that this event is fired: Here is my Customer class that implements the INotifyPropertyChanged event: public class Customer : INotifyPropertyChanged { private string _firstName; public string LastName { get; set; } public event PropertyChangedEventHandler PropertyChanged; protected void OnPropertyChanged(string propertyName) { if(PropertyChanged != null) PropertyChanged(this,new PropertyChangedEventArgs(propertyName)); } public string FirstName { get { return

How do you correctly update a databound datagridview from a background thread

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问题 I have a custom object that implements INotifyPropertyChanged. I have a collection of these objects where the collection is based on BindingList I have created a binding source for the collection, and set the datasources of the bindingsource and datagridview. Everything works great, except I need to update properties on the custom object from background threads. when I do so, I get the following error : BindingSource cannot be its own data source. Do not set the DataSource and DataMember

C#/WPF: PropertyChanged for all Properties in ViewModel?

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问题 I've a class like this: public class PersonViewModel : ViewModelBase //Here is the INotifyPropertyChanged Stuff { public PersonViewModel(Person person) { PersonEntity = person; } public Person PersonEntity { get { return PersonEntity.Name; } private set { PersonEntity.Name = value; RaisePropertyChanged("PersonEntity"); } public string Name { get { return PersonEntity.Name; } set { PersonEntity.Name = value; RaisePropertyChanged("Name"); } public int Age{ get { return PersonEntity.Age; } set {