Caliburn.micro和一个用户控件单击处理程序

Question

I have created a very simple user control, an ImageButton

<UserControl x:Class="SampleApp.Controls.ImageButton"
             Name="ImageButtonControl"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             d:DesignHeight="300"
             d:DesignWidth="300"
             mc:Ignorable="d">
    <Button>
        <Grid>
            <Grid.RowDefinitions>
                <RowDefinition Height="1*" />
                <RowDefinition Height="6*" />
                <RowDefinition Height="2*" />
                <RowDefinition Height="1*" />
            </Grid.RowDefinitions>
            <Image Grid.Row="1" Source="{Binding ElementName=ImageButtonControl, Path=Image}" VerticalAlignment="Stretch" HorizontalAlignment="Center" />
            <TextBlock Grid.Row="2" Text="{Binding ElementName=ImageButtonControl, Path=Text}" VerticalAlignment="Stretch" HorizontalAlignment="Center" />
        </Grid>
    </Button>
</UserControl>

With code behind:

using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;

namespace SampleApp.Controls
{
    /// <summary>
    /// Interaction logic for ImageButton.xaml
    /// </summary>
    public partial class ImageButton : UserControl
    {
        public ImageButton()
        {
            InitializeComponent();
        }

        public string Text
        {
            get { return (string)GetValue(TextProperty); }
            set { SetValue(TextProperty, value); }
        }

        public static readonly DependencyProperty TextProperty =
          DependencyProperty.Register("Text", typeof(string), typeof(ImageButton), new UIPropertyMetadata(""));

        public ImageSource Image
        {
            get { return (ImageSource)GetValue(ImageProperty); }
            set { SetValue(ImageProperty, value); }
        }

        public static readonly DependencyProperty ImageProperty =
           DependencyProperty.Register("Image", typeof(ImageSource), typeof(ImageButton), new UIPropertyMetadata(null)); 
    }
}

Now I want to use that in my little sample application like

xmlns:controls="clr-namespace:SampleApp.Controls"

<controls:ImageButton Grid.Row="1"
                              Grid.Column="1"
                              Margin="2"
                              Image="/Images/link.png"
                              Text="DoSomething">
            <i:Interaction.Triggers>
                <i:EventTrigger EventName="Click">
                    <cal:ActionMessage MethodName="DoSomething" />
                </i:EventTrigger>
            </i:Interaction.Triggers>
        </controls:ImageButton>

If I give it ax:Name, like

<controls:ImageButton x:Name="DoSomething" 

eg DoSomething the method DoSomething with that name is directly called when the view is shown, ie when I active the viewmodel that contains that button, just like I click the Button (if it was a normal button and not a usercontrol, it would work that way), but the button-click handler is never called on clicking.

Now I tried to add an ActionMessage as seen above, but it does not work either...

What is wrong here?

Answer 1

That's because there is no convention configured for your user control type. You could either add a convention via the ConventionManager (see http://caliburnmicro.codeplex.com/wikipage?title=All%20About%20Conventions ), or you could derive your type from Button instead.

You could also not use a custom user control and instead just add the image to the Content property of the Button in your view.