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POHow do I use CallMethodAction to call a method inside the viewmodel when a custom routed event is fired from inside the usercontrol?
 

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  1. POHow do I use CallMethodAction to call a method inside the viewmodel when a custom routed event is fired from inside the usercontrol?
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    <p>I have a UserControl with a registered routed event: </p> <pre><code> public static readonly RoutedEvent OnVisualChartRangeChangedEvent = EventManager.RegisterRoutedEvent("OnVisualChartRangeChanged", RoutingStrategy.Bubble, typeof(OnScrollChangedHandler), typeof(ChartBehavior)); public event OnScrollChangedHandler OnVisualChartRangeChanged { add { AssociatedObject.AddHandler(OnVisualChartRangeChangedEvent, value); } remove { AssociatedObject.RemoveHandler(OnVisualChartRangeChangedEvent, value); } } </code></pre> <p>I fire this routed event from the user control like this:</p> <pre><code> protected virtual void OnScrollEvent(object oldValue, object newValue) { AssociatedObject.RaiseEvent(new DateTimeEventArgs(OnVisualChartRangeChangedEvent, minDate, maxDate)); } </code></pre> <p>I imbed this usercontrol inside my main view like this:</p> <pre><code> Title="MainWindow" Height="350" Width="525"&gt; &lt;Grid&gt; &lt;historicChart:HistoricChartControl&gt;&lt;/historicChart:HistoricChartControl&gt; &lt;/Grid&gt; </code></pre> <p>and I would like to handle the custom routed event by calling a method from my Viewmodel when this event is fired.</p> <p>I tried this at first: </p> <pre><code>&lt;Grid&gt; &lt;historicChart:HistoricChartControl behaviours:ChartBehavior.OnVisualChartRangeChanged="VisualChartRangeChanged"/&gt; &lt;/Grid&gt; </code></pre> <p>but this requires that I go against the MVVM since the handler method (VisualChartRangeChanged) would be placed in the View and not the Viewmodel.</p> <p>I then tried this:</p> <pre><code> Title="MainWindow" Height="350" Width="525"&gt; &lt;Grid&gt; &lt;!--behaviours:ChartBehavior.OnVisualChartRangeChanged="RoutedEventHandler"--&gt; &lt;historicChart:HistoricChartControl&gt; &lt;i:Interaction.Triggers&gt; &lt;i:EventTrigger EventName="OnVisualChartRangeChanged"&gt; &lt;ei:CallMethodAction TargetObject="{Binding}" MethodName="MyMethod"/&gt; &lt;/i:EventTrigger&gt; &lt;/i:Interaction.Triggers&gt; &lt;/historicChart:HistoricChartControl&gt; &lt;/Grid&gt; </code></pre> <p>but the event handler method (MyMethod) is not being called.</p> <p>Can someone please provide an example for how this is done?</p> <p>Thanks.</p> <hr> <p>EDITED</p> <p>So I modified the code as follows:</p> <pre><code> &lt;i:Interaction.Triggers&gt; &lt;i:EventTrigger EventName="{x:Static behaviours:ChartBehavior.OnVisualChartRangeChangedEvent}"&gt; &lt;ei:CallMethodAction TargetObject="{Binding}" MethodName="MyMethod"/&gt; &lt;/i:EventTrigger&gt; &lt;/i:Interaction.Triggers&gt; </code></pre> <p>Not only do I see this: <a href="http://i.stack.imgur.com/xR9DY.jpg" rel="nofollow">http://i.stack.imgur.com/xR9DY.jpg</a></p> <p>but even though it compiles despite the notification shown, I get this inner exception:</p> <p>{"'ChartBehavior.OnVisualChartRangeChanged' is not a valid value for property 'EventName'."}</p> <p>Is there a better technique to handle a routed event from a usercontrol by calling a handler method in the main view's viewmodel?</p>
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    1. USguerillacodester
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    1. COTry something like this `<i:EventTrigger EventName="{x:Static behaviours:ChartBehavior.OnVisualChartRangeChanged">` for your `i:EventTrigger`.
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      1. POHow do I use CallMethodAction to call a method inside the viewmodel when a custom routed event is fired from inside the usercontrol?
      1. USsthotakura
    2. COCan you be more specific? I did this and threw an exception:
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      1. POHow do I use CallMethodAction to call a method inside the viewmodel when a custom routed event is fired from inside the usercontrol?
      1. USguerillacodester
    3. COinstead of this `<i:EventTrigger EventName="OnVisualChartRangeChanged">`, try code from my prev. comment. And, what was the exception?
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      1. POHow do I use CallMethodAction to call a method inside the viewmodel when a custom routed event is fired from inside the usercontrol?
      1. USsthotakura
 

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