WPF ----在UserControl的xaml里绑定依赖属性

Posted 2020-09-03 碎心炼心

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！