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！