inotifypropertychanged

When to use a WPF Dependency Property versus INotifyPropertyChanged

一笑奈何 提交于 2019-11-28 05:45:18
Do folks have any guidance on when a simple .NET property that fires INotifyPropertyChanged.PropertyChanged is sufficient in a view model? Then when do you want to move up to a full blown dependency property? Or are the DPs intended primarily for views? Lukasz Madon There are a few approaches: 1. The dependency property While you using the dependency property it makes the most sense in elements-classes that have a visual appearance ( UIElement s). Pros: WPF do the logic stuff for you Some mechanism like animation use only dependency property 'Fits' ViewModel style Cons: You need to derive form

ObservableDictionary for c#

核能气质少年 提交于 2019-11-28 03:53:47
问题 I'm trying to use following implementation of the ObservableDictionary: ObservableDictionary (C#). When I'm using following code while binding the dictionary to a DataGrid: ObserveableDictionary<string,string> dd=new ObserveableDictionary<string,string>(); .... dd["aa"]="bb"; .... dd["aa"]="cc"; at dd["aa"]="cc"; I'm getting following exception Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index This exception is thrown in

Adding INotifyPropertyChanged to Model?

守給你的承諾、 提交于 2019-11-28 03:40:55
问题 I'm facing some design questions in my wpf MVVM (Prism based) application, would be happy to get your advice. My model is very simple: public class Customer { public string FirstName {get;set;} public string LastName {get;set;} } As you can see, I don't have any INotifyPropertyChnaged support for my Model class. I also have ViewModel for the CustomerDetails screen, that support INotifyPropertyChanged. public class CustomerDetailsViewModel:INotifyPropertyChanged /*Or NotificationObject*/ { /

Updating a PropertyGrid

邮差的信 提交于 2019-11-28 03:25:59
问题 How can I have a property grid update automatically when the object in its SelectedObject property changes? I've tried implementing INotifyPropertyChanged in my class but the property grid does not actually show the new propertyies of the object in the background until I click on it. I've tried subscribing to the PropertyChanged event of my object directly, and calling the Refresh() method of the PropertyGrid when it is envoked. But some of my properties are related. Meaning changing one

BindableBase vs INotifyChanged

北城余情 提交于 2019-11-27 21:26:17
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. Rohit 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 { get { return _firstName; } set { if (_firstName == value) return; _firstName = value;

Implementing NotifyPropertyChanged without magic strings [duplicate]

眉间皱痕 提交于 2019-11-27 19:08:16
Possible Duplicate: typesafe NotifyPropertyChanged using linq expressions I'm working on a large team application which is suffering from heavy use of magic strings in the form of NotifyPropertyChanged("PropertyName") , - the standard implementation when consulting Microsoft. We're also suffering from a great number of misnamed properties (working with an object model for a computation module that has hundreds of stored calculated properties) - all of which are bound to the UI. My team experiences many bugs related to property name changes leading to incorrect magic strings and breaking

Subscribe to INotifyPropertyChanged for nested (child) objects

好久不见. 提交于 2019-11-27 18:46:41
I'm looking for a clean and elegant solution to handle the INotifyPropertyChanged event of nested (child) objects. Example code: public class Person : INotifyPropertyChanged { private string _firstName; private int _age; private Person _bestFriend; public string FirstName { get { return _firstName; } set { // Short implementation for simplicity reasons _firstName = value; RaisePropertyChanged("FirstName"); } } public int Age { get { return _age; } set { // Short implementation for simplicity reasons _age = value; RaisePropertyChanged("Age"); } } public Person BestFriend { get { return

Simplest way to achieve automatic notification of property change

我是研究僧i 提交于 2019-11-27 17:37:48
I know that there are solutions out there for implementing INotifyPropertyChanged, but none of them are as simple as: reference this library, create/add this attribute, done (I'm thinking Aspect-Oriented Programming here). Does anyone know of a really simple way to do this? Bonus points if the solution is free. Here are some relevant links (none of which provide a simple enough answer): Aspect Examples (INotifyPropertyChanged via aspects) LinFu INotifyPropertyChanged auto wiring or how to get rid of redundant code INotifyPropertyChanged With Unity Interception AOP Try this https://github.com

PropertyChanged event always null

本小妞迷上赌 提交于 2019-11-27 15:36:58
问题 I have the following (abbreviated) xaml: <TextBlock Text="{Binding Path=statusMsg, UpdateSourceTrigger=PropertyChanged}"/> I have a singleton class: public class StatusMessage : INotifyPropertyChanged { private static StatusMessage instance = new StatusMessage(); private StatusMessage() { } public static StatusMessage GetInstance() { return instance; } public event PropertyChangedEventHandler PropertyChanged; private void OnPropertyChanged(string status) { if (PropertyChanged != null) {

typesafe NotifyPropertyChanged using linq expressions

ⅰ亾dé卋堺 提交于 2019-11-27 14:30:17
Form Build your own MVVM I have the following code that lets us have typesafe NotifyOfPropertyChange calls: public void NotifyOfPropertyChange<TProperty>(Expression<Func<TProperty>> property) { var lambda = (LambdaExpression)property; MemberExpression memberExpression; if (lambda.Body is UnaryExpression) { var unaryExpression = (UnaryExpression)lambda.Body; memberExpression = (MemberExpression)unaryExpression.Operand; } else memberExpression = (MemberExpression)lambda.Body; NotifyOfPropertyChange(memberExpression.Member.Name); } How does this approach compare to standard simple strings