dependencyobject

Make dependency object properties bindable as a static resource?

由 混江龙づ霸主 提交于 2021-02-08 21:00:42
问题 How to make an array of dependency object properties bindable for later binding as a static resource? The code I have now, it seems that my DependencyObject bypasses the dependency property system... I have the following class: public class ValueMarker : DependencyObject { public static readonly DependencyProperty BrushProperty = DependencyProperty.Register("Brush", typeof(Brush), typeof(ValueMarker), new FrameworkPropertyMetadata(Brushes.Aqua)); public static readonly DependencyProperty

DependencyObject/DependencyProperty

由 陌路散爱 提交于 2021-01-13 00:38:58
DependencyProperty只能定义在DependencyObject对象中，WPF大多数基础类都是这个类的子类。比如UIElement.在WPF中定义的目标属性必须是依赖属性。 同时我们经常会更新座位源的底层数据，然后更新到界面，这是被绑源必须实现INotifyPropertyChanged接口。 当源数据更新时如果想更新界面需要触发PropertyChanged事件， WPF will subscribe to the PropertyChanged event when you bind to your object. This is the core way that databinding works. It actually does this via the PropertyChangedEventManager using the WeakEvent pattern in WPF. The INotifyPropertyChanged interface is used to notify clients, typically binding clients, which a property value has changed. The INotifyPropertyChanged interface contains an event called

WPF DependencyProperty Validation Binding to the object property

由 左心房为你撑大大i 提交于 2020-01-03 03:25:55
问题 I am trying to create a validation rule for a given control (in this scenario, it is the TextBox). I am not able to obtain a successful Binding to the property of an object, although appropriate steps were taken: ValidationRule and DepedencyProperty are taken advantage of. Kindly find code below. A side note is that "Is Required" in the custom Validation class is always False, unless I explicitly set the value in the XAML (no Binding, as per "Is Ranged" parameter). Any tips and suggestions

Can a class derived from DependencyObject marked as serializable?

由 天大地大妈咪最大 提交于 2019-12-25 09:42:15
问题 What des it mean by the following sentence DependencyObjects are not marked as serializable To my knowledge, I can have a class which inherits from DependencyObject...and I can mark it as serializable. Anyway serialize property is not inheritable. Could someone make me clear. Thanks in advance. 回答1: This means that a class that derives from DependencyObject cannot be serialized with standard serializers. As a workaround you could use XamlReader/XamlWriter as shown in this article. 回答2:

trainings DependencyObject - custom command

由 烂漫一生 提交于 2019-12-25 09:20:03
问题 I try to create Command which inherit from DependencyObject and ICommand. I have the following code: public class CustomCommand : DependencyObject, ICommand { public static readonly DependencyProperty CommandProperty; public static readonly DependencyProperty AfterCommandProperty; static CustomCommand() { var ownerType = typeof(CustomCommand); CommandProperty = DependencyProperty.RegisterAttached("Command", typeof(Action), ownerType, new PropertyMetadata(null)); AfterCommandProperty =

Set bindings for custom DependencyObjects

由 余生颓废 提交于 2019-12-25 08:23:31
问题 This is a continuation of a question here: Trying to setup a custom DependencyObject. Clearly missing something. It's not practical to edit the original question; changes are too great. So I'm starting a fresh question. I'm trying to setup bindings between custom DependencyObjects in my UWP app. The relevant code is below. I am seeing calls to ActualWidthPropertyChanged, but they are not triggering any call to WidthPropertyChanged. What am I missing? class WindowsElement: DependencyObject {

Specify Binding of DependencyProperty in UserControl itself

由 不打扰是莪最后的温柔 提交于 2019-12-24 12:23:07
问题 Following up on my previous question (Change brushes based on ViewModel property) In my UserControl I have have a DependencyObject . I want to bind that object to a property of my ViewModel . In this case a CarViewModel , property name is Status and returns an enum value. public partial class CarView : UserControl { public CarStatus Status { get { return (CarStatus)GetValue(CarStatusProperty); } set { SetValue(CarStatusProperty, value); } } public static readonly DependencyProperty

Child object property change fires parents DependencyPropertyChanged callback?

由 安稳与你 提交于 2019-12-23 06:06:03
问题 In defining a base class inheriting an the Animatable , class, I have discovered what I am finding to be some odd behavior. When I create a Child DependencyProperty within a 'Parent' class, then define an instance of that 'Parent' class, then alter a property on the parents child, the PropertyChangedCallback I defined for the Parents Child property fires. In compliance with the requisite Minimal, Complete and Verifiable Example: using System; using System.Collections.Generic; using System

Using Dependency object for color animation WP8

由 …衆ロ難τιáo~ 提交于 2019-12-14 01:46:31
问题 I'm using a button where I've shaped it, in its ControlTemplate. I've also added a storyboard in the controlTemplate. The storyboard changes the boarder of the element in my controlTemplate. I access this from the code behind and activate it, the problem is when I do this on the phone there is a lag. I've structured my code after the MVVM structure, my view is: <Button x:Name="Button1" BorderThickness="0" BorderBrush="Transparent"> <Button.Template> <ControlTemplate x:Name="Control"> <Path x

Frustrating error in WPF (.NET 4.0) internals: Hashtable insert failed. Load factor too high

由 梦想与她 提交于 2019-12-13 04:42:37
问题 I have built custom Rules Engine, where each element of this engine is a descendant of DependencyObject class, so that it could be described in XAML including support for dependency properties, markup extensions, bindings, and so on. The purpose of this Rules Engine is to process certain information which comes as an input and to return the output information back to the queue. The entire tree of object is being instantiated once (from XAML) in a single thread and the series of Input objects
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