Caliburn.Micro Action with parameter not binding

c#, caliburn.micro, xaml

Solution

Your view model method takes two parameters, but you're only passing one.

Either change your view to pass the `$source`:

<i:Interaction.Triggers>
    <i:EventTrigger EventName="KeyUp">
        <cal:ActionMessage MethodName="OnKeyUp" >
           <cal:Parameter Value="$source" />
           <cal:Parameter Value="$eventArgs" />
        </cal:ActionMessage>
    </i:EventTrigger>
</i:Interaction.Triggers>

or change your method to just take the event arguments:

public void OnKeyUp(KeyEventArgs e) { ... }

You could also use the much nicer shorthand:

<TextBox cal:Message.Attach="[Event KeyUp] = [Action OnKeyUp($source, $eventArgs)]" />

Problem

I have a textbox with the following: ``` <i:Interaction.Triggers> <i:EventTrigger EventName="KeyUp" > <cal:ActionMessage MethodName="OnKeyUp" > <cal:Parameter Value="$eventArgs"/> </cal:ActionMessage> </i:EventTrigger> ``` If I run this, an error message is produced saying "No target found for Method OnKeyUp." If I remove the parameter from the message, and the method, then it runs fine. This is the method. ``` public void OnKeyUp(object sender, KeyEventArgs e) { MessageBox.Show(e.Key.ToString()); } ``` I don't see what the issue is.

Original source