WPF将内部控件与父数据上下文绑定

I made a user control

我做了一个用户控件

<UserControl x:Class="MyApp.MyControl"
         xmlns="https://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="https://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:mc="https://schemas.openxmlformats.org/markup-compatibility/2006" 
         xmlns:d="https://schemas.microsoft.com/expression/blend/2008" 
         mc:Ignorable="d"  x:Name="uc">
<Grid Width="Auto" Height="Auto">
    <TextBlock Text="{Binding Path=DataContext.TextContent, ElementName=uc}"/>
    <TextBlock Text="{Binding Path=DataContext.TextContent2, ElementName=uc}"/>
</Grid>
<UserContro