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最新评论
As discussed in my previous post, - wpf - Dependency Property Value Precedence, and the original article on Dependency Property Value Precedence; There exists situation where the value of some DependencyProperty is determined by at runtime according to the list of precedence. e..g the background of a TextBlock in a ToolWindow is null, but because the ToolWindow has background property overriden, you ends up saying the TextBlock to have the background of the ToolWindow.
Below shows the method that return an effective value of DependencyProperty identified by the propertyName parameter.
/// <summary> /// Get the effective property from the Dependency Property and the Metadata system /// </summary> /// <typeparam name="T"></typeparam> /// <param name="propertyName"></param> /// <param name="element"></param> /// <returns></returns> public static T GetEffectiveDependencyPropertyValue<T>(string propertyName, FrameworkElement element) { if (element == null) throw new ArgumentNullException("element"); if (propertyName == null) throw new ArgumentNullException("propertyName"); var visual = (DependencyObject)element; while (visual != null) { var propertyDescriptor = DependencyPropertyDescriptor.FromName(propertyName, visual.GetType(), visual.GetType(), true); var propertyValue = propertyDescriptor.GetValue(visual); if (propertyValue != null) { return (T)propertyValue; } visual = LogicalTreeHelper.GetParent(visual); } return default(T); }
To use it, you just do
FrameworkElement visua = ... var background = GetEffectiveDependencyPropertyValue<Brush>("Background", visual);
发表评论
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wpf - example to enhance ComboBox for AutoComplete
2014-09-19 15:56 1977first let’s see an example ... -
WPF – Virtualization – VirutalizationStackPanel and ItemsPanelTemplate
2013-08-05 21:55 1411Topic: WPF – Virtualization – ... -
wpf - BehaviorBase and one use examples
2013-06-18 18:41 1313Behavior is something that we ... -
WPF - Setting foreground color of Entire window
2013-06-13 16:00 1920You might as well as I would s ... -
WPF - Enhanced TabControl - TabControlEx aka Prerendering TabControl
2013-06-13 13:12 5331As an opening word, let's che ... -
wpf - ControlTemplate and AddLogicChild/RemoveLogicalChild
2013-06-10 15:42 1186Recently I was trying to debug ... -
wpf - default implicit style
2013-05-10 10:24 795We know that if you left out ... -
wpf - Style setter on the attached property
2013-05-08 14:54 2852I believe that you are familia ... -
wpf - specify enum values in xaml
2013-05-08 11:31 3588Many a situation you find tha ... -
wpf - IG xamDataGrid bind to XmlDataProvider with Xml Island
2012-12-18 14:28 1287Sometimes you may bind to some ... -
wpf - translate winform button/mouse event to wpf events
2012-12-12 17:37 2162It is common that we sometimes ... -
wpf - Freezable and its meaning
2012-09-27 12:38 0This article is based on the di ... -
wpf - Customize the grid lines for original wpf Grid control
2012-09-27 12:01 1458The System.WIndows.Controls.Gri ... -
c# - Convert from System.Drawing.Image to System.WIndows.Media.ImageSource
2012-09-25 14:27 7417In Previous discussion, we have ... -
wpf - Default(Theme) style and its DefaultStyleKey
2012-08-28 17:54 1387As dicsused in the subsection o ... -
wpf - Dependency Property Value Precedence
2012-08-28 18:56 882A dependency property to an Dep ... -
wpf - WPF TemplateBinding vs RelativeSource TemplatedParent
2012-08-28 14:20 3714This is a post that summarizes ... -
wpf - ICutomTypeDescriptor , PropertyDescriptor and its use in PropertyGrid
2012-08-28 14:04 3582The type ICustomTypeDe ... -
wpf - tips to convert UI controls in WPF/Silverlight/Winforms into a Bitmap
2012-08-27 17:44 976In previous discussion, we have ... -
wpf - input binding examples
2012-08-27 11:47 1223Input binding is the mechanism ...
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