在WPF中从子级执行父级用户控件中的方法

Question

I have a user control named Display in MainWindow.xaml . Display user control itself has a custom class Workspace.cs in it like this:

<UserControl x:Class="Program.Main.Controls.Display.Display"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:workspaces="clr-namespace:Program.Workspaces">

    <Border>
        <Grid>
            <workspaces:Workspace x:Name="MyWorkspace" ClipToBounds="True"/>
        </Grid>
    </Border>
</UserControl>

In my custom class that is Worskspace.cs I'm rising a MouseLeftButtonDown event, I want to execute the ThisCommandCameFromWorkspace method in Display.xaml.cs when rising this event.

What is the best approach to do this? And What is the easiest?

Updated:

In my Workspace.cs I have

public event Action MyEventHandler;

private void OnMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
    {
            if (MyEventHandler!= null)
                MyEventHandler();
    }

Now I want to capture this in Display user control and execute a method of its code-behind.

Answer 1

I'd suggest not to use Action as event delegate type, but instead use the common type EventHandler . And don't call it MyEventHandler as it is not a handler, but just the event:

public event EventHandler MyEvent;

private void OnMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    if (MyEvent != null)
    {
        MyEvent(this, EventArgs.Empty);
    }
}

Now you would easily attach a handler for the event in the Display's XAML (supported by Intellisense in Visual Studio):

<workspaces:Workspace ... MyEvent="Display_MyEvent"/>