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EventSetter Class

Represents an event setter in a style. Event setters invoke the specified event handlers in response to events.

Namespace:  System.Windows
Assembly:  PresentationFramework (in PresentationFramework.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation

public class EventSetter : SetterBase
<EventSetter .../>

Event setters invoke the specified event handlers in response to routed events, which apply to all elements that reference the Style rather than requiring you to attach instance handlers to each individual element. Only Style.Setters support EventSetter objects.

You can only declare event setters for events that are routed events. You can declare event setters for routed events with a direct routing strategy, bubbling events, or tunneling events.

Instances of the EventSetter class are usually created through Extensible Application Markup Language (XAML), as an object element within a style defined through XAML. An EventSetter might also be instantiated from code.

Event setters cannot be used in a style that is contained in a theme resource dictionary. This is because a theme resource dictionary at run time is often loose binary XAML (BAML) files, and does not have any scope defined where accompanying code-behind that defines the handlers can exist.

Handlers attached through event setters are invoked after any class handlers for an event, and also after any instance handlers. As a result, if a class handler or instance handler marks an event handled in its arguments, then the handler declared by an event setter is not invoked, unless the event setter specifically sets HandledEventsToo true.

Event setters may also come from BasedOn styles. The event setter handlers from the style specified as BasedOn will be invoked after the handlers on the immediate style.

Note that only Style.Setters supports EventSetter objects. Triggers (TriggerBase and derived classes) do not support EventSetter.

The following example establishes a single EventSetter within a page-level style.

<StackPanel
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  x:Class="SDKSample.EventOvw2"
  Name="dpanel2"
>
  <StackPanel.Resources>
    <Style TargetType="{x:Type Button}">
      <EventSetter Event="Click" Handler="b1SetColor"/>
    </Style>
  </StackPanel.Resources>
  <Button>Click me</Button>
  <Button Name="ThisButton" Click="HandleThis">
    Raise event, handle it, use handled=true handler to get it anyway.
  </Button>
</StackPanel>

The following shows the example event handlers:

void b1SetColor(object sender, RoutedEventArgs e)
{
  Button b = e.Source as Button;
  b.Background = new SolidColorBrush(Colors.Azure);
}

void HandleThis(object sender, RoutedEventArgs e)
{
  e.Handled=true;
}

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0

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