Behaviors are not working properly inside Style Setter

Behaviors are not working properly inside Style Setter

By : Gennaro De Biase
Date : November 22 2020, 10:48 AM
like below fixes the issue This won't work because behaviors, actions or triggers are designed to be attached to a single element. When you define it inside a style's setter, it's like you are trying to associate it with multiple elements and as you have already seen, the trigger is only called when you interact with the first element with this style.
There's a simple way to fix this. Basically, you need to make sure each element that's associated with this style has a new instance of the trigger you have created. You can have all this logic wrapped inside an attached property and then your style will only need to reference this property.
code :
<Style x:Name="DisplayImage" TargetType="ScrollViewer">
    <Setter Property="VerticalScrollBarVisibility" Value="Hidden" />
    <Setter Property="HorizontalAlignment" Value="Left" />
    <Setter Property="ZoomMode" Value="Disabled" />
    <Setter Property="local:FrameworkElementEx.AttachBehaviors" Value="True" />
public static class FrameworkElementEx
    public static bool GetAttachBehaviors(DependencyObject obj)
        return (bool)obj.GetValue(AttachBehaviorsProperty);

    public static void SetAttachBehaviors(DependencyObject obj, bool value)
        obj.SetValue(AttachBehaviorsProperty, value);

    public static readonly DependencyProperty AttachBehaviorsProperty =
        DependencyProperty.RegisterAttached("AttachBehaviors", typeof(bool), typeof(FrameworkElementEx), new PropertyMetadata(false, Callback));

    private static void Callback(DependencyObject d, DependencyPropertyChangedEventArgs e)
        var behaviors = Interaction.GetBehaviors(d);

        var eventTriggerBehavior = new EventTriggerBehavior
            EventName = "DoubleTapped"
        eventTriggerBehavior.Actions.Add(new ScrollViewerDoubleTap());


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@dynamic property needs setter with multiple behaviors

@dynamic property needs setter with multiple behaviors

By : user2017737
Date : March 29 2020, 07:55 AM
will be helpful for those in need The solution you've tried is not exactly wrong, but should look like this:
code :
if ([uidString respondsToSelector:@selector(addObject:)]) {
    // Already an array, so don't do anything - just assign users = uidString
if ([uidString isKindOfClass[NSArray class]])
Binding a Style Setter Value properly

Binding a Style Setter Value properly

By : Dat Nguyen
Date : March 29 2020, 07:55 AM
will help you You should put you properties into a singleton, this way you can bind to and edit them from anywhere in your application.
MySingleton.cs (ViewModelBase contains an implementation of INotifyPropertyChanged)
code :
public class MySingleton: ViewModelBase
    private static MySingleton instance;
    private static readonly object padlock = new object();

    private FontFamily _myFont = new FontFamily();

    public static MySingleton Instance
            lock (padlock)
                if (instance == null)
                    instance = new MySingleton();
            return instance;

    public FontFamily MyFont
        get { return _myFont ; }
            _myFont = value;
<Application ...
            <local:CurrentDataSingleton x:Key="Singleton"/>
                <ResourceDictionary Source="MyResourceDictionary.xaml"/>
    <ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

        <Style x:Key="NormalFontStyle">
            <Setter Property="Control.FontFamily" Value="{Binding Source={StaticResource  Singleton}, Path=Instance.MyFont}"/>

        <Style x:Key="BigFontStyle">
            <Setter Property="Control.FontFamily" Value="{Binding MyFont}"/>
            <Setter Property="Control.FontSize" Value="{Binding MyBigFontSize}"/>
`Style="{StaticResource stylename}"`
MySingleton.Instance.Property = ?
Binding Value in Style Setter not working

Binding Value in Style Setter not working

By : michaelpr
Date : March 29 2020, 07:55 AM
I hope this helps you . I used the Snoop to find the binding issues. Found that the outer listbox was getting the DataContext but was not accessible to the inner listbox. I replaced the below code
code :
<Setter Property="Foreground" Value="{Binding SelectedItemForegroundColor, Converter={StaticResource stringToBrushConverter}}"/>
<Setter Property="Foreground" Value="{Binding Path=DataContext.SelectedResultItemForegroundColor, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=ListBox}}"/>
UWP Binding in Style Setter not working

UWP Binding in Style Setter not working

By : wunder_awesome
Date : March 29 2020, 07:55 AM
help you fix your problem As noted in the section Migration notes on the Setter.Value property page on MSDN, UWP/Windows Runtime does not support bindings in Style Setters.
code :
public class BindingHelper
    public static readonly DependencyProperty GridColumnBindingPathProperty =
            "GridColumnBindingPath", typeof(string), typeof(BindingHelper),
            new PropertyMetadata(null, GridBindingPathPropertyChanged));

    public static readonly DependencyProperty GridRowBindingPathProperty =
            "GridRowBindingPath", typeof(string), typeof(BindingHelper),
            new PropertyMetadata(null, GridBindingPathPropertyChanged));

    public static string GetGridColumnBindingPath(DependencyObject obj)
        return (string)obj.GetValue(GridColumnBindingPathProperty);

    public static void SetGridColumnBindingPath(DependencyObject obj, string value)
        obj.SetValue(GridColumnBindingPathProperty, value);

    public static string GetGridRowBindingPath(DependencyObject obj)
        return (string)obj.GetValue(GridRowBindingPathProperty);

    public static void SetGridRowBindingPath(DependencyObject obj, string value)
        obj.SetValue(GridRowBindingPathProperty, value);

    private static void GridBindingPathPropertyChanged(
        DependencyObject obj, DependencyPropertyChangedEventArgs e)
        var propertyPath = e.NewValue as string;

        if (propertyPath != null)
            var gridProperty =
                e.Property == GridColumnBindingPathProperty
                ? Grid.ColumnProperty
                : Grid.RowProperty;

                new Binding { Path = new PropertyPath(propertyPath) });
    <Style TargetType="ContentPresenter">
        <Setter Property="local:BindingHelper.GridColumnBindingPath" Value="Level"/>
        <Setter Property="local:BindingHelper.GridRowBindingPath" Value="Row"/>
WPF style setter not working

WPF style setter not working

By : Steven Rosenberg
Date : March 29 2020, 07:55 AM
it should still fix some issue I have a custom user control that contains a combo box. I've added a ComboBoxWidth dependency property to allow developer to set width if they want. Using a style setter, I'd like to set the widths for all these combo boxes to the same value on another user control for size consistency. But, it is not working. It works if I set the size separately on each control. When the size is specified in the style setter, it is ignored. If I change the Property string from "ComboBoxWidth" to "Width", the entire width of all the controls are changed. So, it looks like the style formatting is correct. Am I missing something? This is the first time I've tried to apply a style to my own custom dependency property. , A so-called "local value" of a dependency property, like
code :
this.ComboBoxWidth = 175.0;
<Setter Property="ComboBoxWidth" Value="400"/>
public class AngleUserControl : ...
    static AngleUserControl()
            new PropertyMetadata(175d));
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