WPF 关于如何在MainView的xmal里面直接对UserControl里的某个控件的属性进行赋值

定义一个UserControl控件，将里面的值进行绑定

<UserControl x:Class="CeShiMvvmDeTest.Test"
             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" 
             xmlns:local="clr-namespace:CeShiMvvmDeTest"
             mc:Ignorable="d" 
             d:DesignHeight="450" d:DesignWidth="800">
    <StackPanel Background="White">
    	// 着重注意这句话
        <TextBlock Text="{Binding Id,RelativeSource={RelativeSource AncestorType=UserControl}}" FontSize="60"/>
    </StackPanel>
</UserControl>

这个UserControl还需要进入后端，设置依赖属性Id

public partial class Test : UserControl
    {
        public Test()
        {
            InitializeComponent();
        }



        // 猜想1：添加依赖属性，通过依赖属性绑定到Test后台代码
        // 定义依赖属性Id
        public int Id
        {
            get { return (int)GetValue(IdProperty); }
            set { SetValue(IdProperty, value); }
        }
        public static readonly DependencyProperty IdProperty =
            DependencyProperty.Register("Id", typeof(int), typeof(Test), new PropertyMetadata(null));

MainView里面引用

<StackPanel  Grid.Row="1">
            <local:Test Id="456"/>
            <local:Test Id="123"/>
        </StackPanel>