Set values(Setters) in Event Triggers

In C# ASP.NET, setting properties of a control on event occurrence is done with C#(.cs) file which is called as back end code. But in Windows Presentation Foundation(WPF),we have a feasibility to set the properties of a control in XAML file itself without the use of C#(.cs) file.

Let us see the implementation of Button click event:

• A general Trigger to set a property when a property is changed is as follows:

               <ControlTemplate.Triggers>
                   <Trigger Property="Background" Value="White">
                       <Setter Property="Foreground" Value="Black" />
                   </Trigger>
               </ControlTemplate.Triggers> 

• Event Trigger(Which is desired and cannot be possible to implement) 

                <ControlTemplate.Triggers>
                   <EventTrigger RoutedEvent="Button.Click">
                       <Setter Property="Foreground" Value="Black" />
                   </EventTrigger>
               </ControlTemplate.Triggers>

•  But the above code cannot be implemented as the Event Triggers doesn't support Setter tags, Hence, we have another approach in Event Triggers to set any property of a control as follows:

               <EventTrigger RoutedEvent="Button.Click">
                   <BeginStoryboard>
                       <Storyboard>
                           <ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetName="ButtonGrid"

                                    Storyboard.TargetProperty="Background">
                                <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource BlackBrush}" />
                            </ObjectAnimationUsingKeyFrames>
                        </Storyboard>
                    </BeginStoryboard>
               </EventTrigger>