场景：在定义wpf 用户控件的时候，希望使用时设置自定义的属性来改变用户控件里的状态或内容等。

下面直接上实例代码：

用户控件的后台代码，定义依赖属性

   public partial class MyUserControl : UserControl    {        public MyUserControl()        {            InitializeComponent();        }        public string MyProperty        {            get { return (string)GetValue(MyPropertyProperty); }            set { SetValue(MyPropertyProperty, value); }        }        // Using a DependencyProperty as the backing store for MyProperty.  This enables animation, styling, binding, etc...        public static readonly DependencyProperty MyPropertyProperty =            DependencyProperty.Register("MyProperty", typeof(string), typeof(MyUserControl), new PropertyMetadata(""));            }}

Xaml 代码中绑定依赖属性 

<UserControl x:Class="WPFTest.MyUserControl"             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"             xmlns:myCtl="clr-namespace:WPFTest"             d:DesignHeight="300"             d:DesignWidth="300"             mc:Ignorable="d">    <StackPanel>        <TextBlock Text="{Binding RelativeSource={RelativeSource   Mode= FindAncestor,  AncestorType={x:Type myCtl:MyUserControl}}, Path=MyProperty}" />    </StackPanel></UserControl>

下面是自定义控件的使用实例：

<Window x:Class="WPFTest.MainWindow"        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"        xmlns:WPFTest="clr-namespace:WPFTest"        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"        Title="MainWindow"        Width="525"        Height="350"        mc:Ignorable="d">    <Grid>        <WPFTest:MyUserControl MyProperty="ddd" />    </Grid></Window>

希望对大家有用！

WPF ----在UserControl的xaml里绑定依赖属性