propertychanged

来源： https://stackoverflow.com/questions/9501928/monitor-a-change-in-the-property-of-a-telerik-scheduleview-control-in-wpf

来源： https://stackoverflow.com/questions/9501928/monitor-a-change-in-the-property-of-a-telerik-scheduleview-control-in-wpf

问题 I have a jFormattedTextField and I set setCommitsOnValidEdit to true then I added an event listener to "property change" on "value" property. At first focus of that jFormattedTextField it doesn't call event listener method when typing in it. But on "focusLost" it calls event listener and after that when it receives focus again it calls event listener when typing. I want the event listener be called after any change in any time in that jFormattedTextField (Even in the fist focus). What's the

问题 I'm developing an UI Automation application for Microsoft Word and I need to catch, for a RichEdit text box, the "AutoAddAutomationPropertyChanged" Event via a specific handler through method "AddAutomationPropertyChangedEventHandler". I have my AutomationElement "element" that represents the RichEdit control and I added the event on my class: Automation.AddAutomationPropertyChangedEventHandler(element, TreeScope.Subtree, OnPropertyChanged, new[] { ValuePattern.ValueProperty }); and my

问题 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 problem is that the PropertyChangedCallback is (on some systems) called before OnApplyTemplate so the control parts are still null. The workaround I'm currently using is to save e.NewValue from the PropertyChangedCallback to a member variable and then

问题 I need fast updates, so I was wondering which one is faster and more efficient. 回答1: I performed some measurements, and can proclaim, that using a converter in a binding is cheaper than not using it. We're talking about 9% time saving. Probably, finding / creating a default converter takes more time than taking an instance of a converter from a resource... 来源： https://stackoverflow.com/questions/8872600/which-is-faster-to-use-binding-using-converter-or-update-in-a-property-changed-c

问题 I have a property auto-generated from database in my edmx: Description . I then create a "partial class" .cs file for the entity and add a read-only property: ShortDescription . ShortDescription's getter simply processes Description (removes line feed, carriage return, etc). How can I raise property change notification for ShortDescription on the setter of Description? Thanks! 回答1: This is going to be a hack, but it can be done. First, you need to override ReportPropertyChanging and

问题 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 mode is not enough? can i write without using "UpdateSourceTrigger=PropertyChanged"? <Grid> <TextBox Height="23" HorizontalAlignment="Left" Margin="155,62,0,0" Name="txtSource" VerticalAlignment="Top" Width="120" /> <TextBox Height="23"

问题 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 += [number] } } } var test: Foo = Foo() { didSet { println("I want this to be printed after changing number in test") } } test.number = 1 // Nothing happens 回答1: Nothing happens because the observer is on test , which is a Foo instance. But you changed test.number , not test

问题 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 guessing the property changed is not hit for an Add to the List....how can I implement this in a way to get that property changed event hit??? Do I need to use some other type of collection?! Thanks for any help! namespace SVNQuickOpen.Configuration {