C# e是你的UserControl，也许它根本不应该是UserControl。您可以编写一个包含XAML的数据模板并使用它，也可以为ListBox编写一个样式。如果你需要这些事件，那么用户控件是有意义的，但你可能实际上并不需要这些事件。总而言之，您的意思是我应

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e是你的UserControl，也许它根本不应该是UserControl。您可以编写一个包含XAML的数据模板并使用它，也可以为ListBox编写一个样式。如果你需要这些事件，那么用户控件是有意义的，但你可能实际上并不需要这些事件。总而言之，您的意思是我应该始终使用

DataTemplate

设置我的

DataContext

，并且从不（除此之外）直接绑定

DataContext

。应该为您的模型或视图模型设计用户控件。您不应该为UserControl设计视图模型。TextBox是否具有TextBoxViewModel？不，这有一个很好的理由。有关此反模式的实际示例以及其失败原因，请阅读。应为您的模型或视图模型设计用户控件。您不应该为UserControl设计视图模型。TextBox是否具有TextBoxViewModel？不，这有一个很好的理由。这是一个反模式的真实例子，以及它为什么会失败。

<Window x:Name="FCTWindow" x:Class="CatalogInterface.MainWindow"
        xmlns:local="clr-namespace:CatalogInterface"
        xmlns:vm="clr-namespace:CatalogInterface.ViewModels"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="532">

    <Window.Resources>
        <vm:MainWindowViewModel x:Key="ViewModel" />
    </Window.Resources>

    <Grid DataContext="{Binding Path=ViewModel.DirFilesListBoxViewModel}" x:Name="BodyGridLeft" Grid.Row="0" Grid.Column="0">
        <local:ctlDirFilesListBox>
            <!--
                Need to access the `ItemsSource="{Binding }"` and
                 `SelectedItem="{Binding Path=}"` of the ListBox in 
                 `ctlDirFilesListBox` view -->
        </local:ctlDirFilesListBox>
</Window>

<UserControl x:Class="CatalogInterface.ctlDirFilesListBox"
         xmlns:local="clr-namespace:CatalogInterface"
         xmlns:vm="clr-namespace:CatalogInterface.ViewModels"
         mc:Ignorable="d" 
         d:DesignHeight="300" d:DesignWidth="300">

<Grid x:Name="MainControlGrid">           
    <ListBox SelectionChanged="ListBoxItem_SelectionChanged" 
                         HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Background="#FFFFFF"
                         Grid.Row="2" Grid.Column="1" Grid.ColumnSpan="3" BorderThickness="0">
        <ListBox.ItemContainerStyle>
            <Style TargetType="{x:Type ListBoxItem}" BasedOn="{StaticResource {x:Type ListBoxItem}}">
                <EventSetter Event="MouseDoubleClick" Handler="ListBoxItem_MouseDoubleClick"/>
                <EventSetter Event="KeyDown" Handler="ListBoxItem_KeyDown"/>
            </Style>
        </ListBox.ItemContainerStyle>
    </ListBox>
</Grid>
</UserControl>

using System;
using System.Text;

namespace CatalogInterface.ViewModels
{
    class MainWindowViewModel
    {
        public DirFilesViewModel DirFilesViewModel { get; set; }

        public MainWindowViewModel()
        {
            DirFilesViewModel = new DirFilesViewModel();
        }
    }
}

public MainWindow()
{
    InitializeComponent();

    DataContext = new MainWindowViewModel();
}

<Window.DataContext>
    <vm:MainWindowViewModel />
<Window.DataContext>

<Grid
    DataContext="{Binding Source={StaticResource ViewModel}}"
    >

<!-- No x:Key, just DataType: It'll be implicitly used for that type. -->
<DataTemplate DataType="{x:Type vm:DirFilesViewModel>
    <local:ctlDirFilesListBox />
</DataTemplate>

<UserControl 
    Grid.Row="0"
    Grid.Column="0"
    Content="{Binding DirFilesViewModel}" 
    />

<ContentControl Content="{Binding SelectedChildVM}" />

        <!--
            Need to access the `ItemsSource="{Binding }"` and
             `SelectedItem="{Binding Path=}"` of the ListBox in 
             `ctlDirFilesListBox` view -->

<UserControl x:Class="CatalogInterface.ctlDirFilesListBox"
         xmlns:local="clr-namespace:CatalogInterface"
         xmlns:vm="clr-namespace:CatalogInterface.ViewModels"
         mc:Ignorable="d" 
         d:DesignHeight="300" d:DesignWidth="300">
<Grid x:Name="MainControlGrid">           
    <ListBox 
        ItemsSource="{Binding Files}"
        SelectedItem="{Binding SelectedFile}"
        SelectionChanged="ListBoxItem_SelectionChanged" 
        HorizontalAlignment="Stretch" 
        VerticalAlignment="Stretch" 
        Background="#FFFFFF"
        Grid.Row="2" 
        Grid.Column="1" 
        Grid.ColumnSpan="3" 
        BorderThickness="0"
        >
        <ListBox.ItemContainerStyle>
            <Style TargetType="{x:Type ListBoxItem}" BasedOn="{StaticResource {x:Type ListBoxItem}}">
                <EventSetter Event="MouseDoubleClick" Handler="ListBoxItem_MouseDoubleClick"/>
                <EventSetter Event="KeyDown" Handler="ListBoxItem_KeyDown"/>
            </Style>
        </ListBox.ItemContainerStyle>
    </ListBox>
</Grid>
</UserControl>

<local:ctlDirFilesListBox ItemsSource="{Binding Property}" SelectedItem="{Binding Property}" />

<ListBox SelectionChanged="ListBoxItem_SelectionChanged" 
                 HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Background="#FFFFFF"
                 Grid.Row="2" Grid.Column="1" Grid.ColumnSpan="3" BorderThickness="0"
                 ItemsSource="{Binding ItemsSource, RelativeSource={RelativeSource AncestorType=UserControl}}"
                 SelectedItem="{Binding SelectedItem, RelativeSource={RelativeSource AncestorType=UserControl}}">
    <ListBox.ItemContainerStyle>
        <Style TargetType="{x:Type ListBoxItem}" BasedOn="{StaticResource {x:Type ListBoxItem}}">
            <EventSetter Event="MouseDoubleClick" Handler="ListBoxItem_MouseDoubleClick"/>
            <EventSetter Event="KeyDown" Handler="ListBoxItem_KeyDown"/>
        </Style>
    </ListBox.ItemContainerStyle>
</ListBox>

public class ctlDirFilesListBox : UserControl
{
    //...

    public static readonly DependencyProperty ItemsSourceProperty =
         DependencyProperty.Register("ItemsSource", typeof(IEnumerable), typeof(ctlDirFilesListBox));

    public IEnumerable ItemsSource
    {
        get { return (IEnumerable)GetValue(ItemsSourceProperty); }
        set { SetValue(ItemsSourceProperty, value); }
    }

    public static readonly DependencyProperty SelectedItemProperty =
        DependencyProperty.Register("ItemsSource", typeof(object), typeof(ctlDirFilesListBox));

    public object SelectedItem
    {
        get { return GetValue(SelectedItemProperty); }
        set { SetValue(SelectedItemProperty, value); }
    }
}