WPF自定义组件，自定义属性（依赖属性）

正常定义的以来属性，在XAML里设置值得时候是不触发Setter的，只能在code中用。

监听 PropertyChangedCallback事件可以感知XAML里的设置，这样才能code和XAML配合使用。
http://stackoverflow.com/questions/5644081/wpf-usercontrol-dependency-property-setter-not-triggering

http://msdn.microsoft.com/zh-cn/library/vstudio/ms745025.aspx

http://msdn.microsoft.com/zh-cn/library/vstudio/ms753358.aspx

<UserControl x:Class="WpfApplication1.UserControl1"

             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 

             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 

             mc:Ignorable="d" 

             d:DesignHeight="300" d:DesignWidth="300" Background="Black">

    <Grid>

        <Button Name="b" Content="Button" Margin="27,26,0,0" Click="b_Click" Height="22" VerticalAlignment="Top" HorizontalAlignment="Left" Width="75"/>



    </Grid>

</UserControl>

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using System.Windows.Navigation;

using System.Windows.Shapes;



namespace WpfApplication1

{

    /// <summary>

    /// UserControl1.xaml の相互作用ロジック

    /// </summary>

    public partial class UserControl1 : UserControl

    {

        public UserControl1()

        {

            InitializeComponent();

        }



        public static readonly DependencyProperty IsAAAProperty = 

            DependencyProperty.Register(

            "IsAAA", typeof(Boolean),

             typeof(UserControl1),

              new FrameworkPropertyMetadata(new PropertyChangedCallback(OnUriChanged)

                  

              )

            );



        private static void OnUriChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)

        {

            if ((bool)e.NewValue == true)

            {

                UserControl1 u = (UserControl1)d;

                u.b.Background = Brushes.Black;

            }

            MessageBox.Show("event");

        }



        public bool IsAAA

        {

            get {

                MessageBox.Show("get");

                return (bool)GetValue(IsAAAProperty);

            }

            set {

                MessageBox.Show("set");

                SetValue(IsAAAProperty, value);

            }

        }



        private void b_Click(object sender, RoutedEventArgs e)

        {



        }

    }

}

 http://www.cjavaphp.com/q/answers-dependency-property-not-working-trying-to-set-through-style-setter-1593523.html

The correct way of implementing a source for an Image in a user control in my opinion is not BitmapSouce. The easiest and best way (according to me again) is using Uri.

Change your dependency property to this (while also defining a change callback event):

ImageSourceProperty = DependencyProperty.Register(

    "ImageSource", typeof (Uri), typeof (MyButton),

    new FrameworkPropertyMetadata(new PropertyChangedCallback(OnImageSourceChanged)));

and the property to this:

public Uri ImageSource

{

    get

    {

           return (Uri)GetValue(ImageSourceProperty);

    }

    set

    {

           SetValue(ImageSourceProperty, value);

    }

}

Where your call back is like this:

private static void OnImageSourceChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)

{

    MyButton hsb = (MyButton)sender;



    Image image = hsb.tehImage;

    image.Source = new BitmapImage((Uri) e.NewValue);

}