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Questions tagged [propertychanged]

221 questions
53
votes
2 answers

In WPF, why doesn't TemplateBinding work where Binding does?

Ok... this is leaving me scratching my head. I have two WPF controls--one's a user control and the other's a custom control. Let's call them UserFoo and CustomFoo. In the control template for CustomFoo, I use an instance of UserFoo which is a…
Mark A. Donohoe
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4 answers

List INotifyPropertyChanged event

I have a simple class with a string property and a List property and I have the INofityPropertyChanged event implemented, but when I do an .Add to the string List this event is not hit so my Converter to display in the ListView is not hit. I am…
theDoke
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How to use PropertyChangedCallBack

I have a TextBox Binded to a dependancy property, I have implemented a PropertyChangedCallBack function, when the text changes I need to call textbox.ScrollToEnd() but I cant since the PropertChanged function need to be static, is there a way around…
Eamonn McEvoy
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how does PropertyChangedEventHandler work?

This is a really simple question, but I was wondering if someone could explain what the 4th line is actually doing? so the first line gives an event to the handler. I don't really know in what circumstances handler will return null or what the last…
James Joshua Street
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4 answers

Why can't I invoke PropertyChanged event from an Extension Method?

I've tried to code a class to avoid a method like "RaisePropertyChanged". I know that I can inherit from a class that has that implementation but in some cases I can't. I've tried with a Extension Method but Visual Studio complain. public static…
Vitor Canova
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Why am i using UpdateSourceTrigger=PropertyChanged ,TwoWay is not enough?

hi; there are Source and target textbox txttarget has a binding to txtsource. when writing something in txtsource, txttarget is changed.Everything is good. But writing on txttarget, i dont see any changes at txttarget? there is TwoWay mode. Twoway…
loki
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2 answers

Monitor a change in the property of a Telerik ScheduleView control in WPF

I have 2 properties to a class (WPF control): HorizontalOffset and VerticalOffset (both public Double's). I would like to call a method whenever these properties change. How can I do this? I know of one way - but I'm pretty sure it's not the right…
user1017882
13
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1 answer

Text on TextBox with UpdateSourceTrigger=PropertyChanged is not updated when coercion of text input results in unchanged source value

I have a text box whose Text property has a TwoWay MultiBinding with UpdateSourceTrigger set to PropertyChanged. The first Binding is to a dependency property (Value) which has a PropertyChangedCallBack function that rounds the value to one decimal…
Neo
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TextBox bound to Decimal with UpdateSourceTrigger=PropertyChanged

I've been battling this issue for a while now and seem not to be able to come up with a concrete workaround - I have a TextBox which is bound to a decimal, and the binding has UpdateSourceTrigger set to PropertyChanged and is so by necessity…
Aaj
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11
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4 answers

ObservableCollection PropertyChanged event

I want to subclass ObservableCollection to add a property to it. Unfortunately, the PropertyChanged event is protected. Basically, I want to subclass it to have a SelectedItem that I can bind to for lists in my MVVM WPF app. Here's the skeleton of…
Jose
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WPF: PropertyChangedCallback triggered only once

I have a user control, which exposes a DependencyProperty called VisibileItems Every time that property gets updated, i need to trigger another event. To achieve that, i added a FrameworkPropertyMetadata with PropertyChangedCallback event. For…
Sonic Soul
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WPF CustomControl: OnApplyTemplate called after PropertyChangedCallback

I am creating a WPF CustomControl that has a dependency property with PropertyChangedCallback. In that Callback method I try to set values on some of the control's parts that I retrieve from OnApplyMethod using the GetTemplateChild() method. The…
Albert Hofmann
9
votes
3 answers

WPF application hang by PropertyChangedEventManager in concurrent environments

I'm working on a complex WPF application which hangs in production once several days. There's a thread other than GUI thread filling data to models bind to the grid and triggers INotifyPropertyChanged.PropertyChanged event. I wrote a script to…
Jeffrey Zhao
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1 answer

Is there a way to get didSet to work when changing a property in a class?

I have a class as property with a property observer. If I change something in that class, is there a way to trigger didSet as shown in the example: class Foo { var items = [1,2,3,4,5] var number: Int = 0 { didSet { items…
Henny Lee
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WPF Update Binding when Bound directly to DataContext w/ Converter

Normally when you want a databound control to 'update,' you use the "PropertyChanged" event to signal to the interface that the data has changed behind the scenes. For instance, you could have a textblock that is bound to the datacontext with a…
Adam
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