我检查了一下，对于之前的ScrollBar.Scroll="TvProperties_Scroll" MouseDown="ScrollViewer_MouseDown"都是我做测试，来测试鼠标拖动滚动条时是否会响应，但我并没有得到和你一样的结论，我无法触发到TvProperties_Scroll事件。
private void TvProperties_Scroll(object sender, System.Windows.Controls.Primitives.ScrollEventArgs e)
{
Console.WriteLine("nihao");
}
这是函数的内容，我只想测试鼠标拖动滚动条是否能触发。

那想会不会是哪边截取了这个响应导致TvProperties_Scroll无法接收到响应呢

@Maoey:

        <Window x:Class="WpfApp2.MainWindow"
    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:local="clr-namespace:WpfApp2"
    mc:Ignorable="d"
    Title="MainWindow" Height="450" Width="800">
<Grid>
    <TreeView ItemsSource="{Binding List}" ScrollViewer.VerticalScrollBarVisibility="Auto" ScrollViewer.PanningMode="Both" Background="Transparent" x:Name="tvProperties" Width="260" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="-1,20,0,0"  >
        <TreeView.ItemContainerStyle>
            <Style TargetType="{x:Type TreeViewItem}">
                <Setter Property="IsExpanded" Value="True"></Setter>
                <Setter Property="TextBlock.Foreground" Value="White"/>
            </Style>

        </TreeView.ItemContainerStyle>
        <TreeView.ItemTemplate>
            <HierarchicalDataTemplate >
                <StackPanel Orientation="Horizontal">
                    <TextBlock VerticalAlignment="Center" Name="nodeName" Text="{Binding text}"></TextBlock>
                </StackPanel>

            </HierarchicalDataTemplate>
        </TreeView.ItemTemplate>

        
    </TreeView>
</Grid>
        </Window>

后台

        /// <summary>
/// MainWindow.xaml 的交互逻辑
/// </summary>
public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        List = new List<Temp>();
        for (int i = 0; i < 100; i++)
        {
            List.Add(new Temp());
        }

        this.DataContext = this;
    }

    public List<Temp> List { get; set; }
}

public class Temp
{
    public string text { get; set; }

    public Temp()
    {
        text = "111";
    }
}

你写的莫问题啊，兄弟，看看别的地方，感觉不简单啊

@猝不及防:

<Grid x:Name="gridLeftColumn" Grid.Column="0" Background="#2C3C5C" Margin="0,0,0,-3" >
<Grid.RowDefinitions>
<RowDefinition Height="590*" x:Name="row0"/>
<RowDefinition Height="37.333"/>
<RowDefinition Height="32.667"/>
<RowDefinition Height="40"/>
</Grid.RowDefinitions>
<Button Content="更新视频树" Style="{StaticResource DefaultButtonStyle}" Click="UpdateTree" Foreground="White" Margin="38,0,10,0" Height="20" VerticalAlignment="Top" HorizontalAlignment="Left"/>
<TreeView Height="{Binding Path=row0}" BorderThickness="0" ScrollViewer.VerticalScrollBarVisibility="Auto" ScrollViewer.PanningMode="Both" Background="Transparent" x:Name="tvProperties" Width="260" SelectedItemChanged="tvProperties_SelectedItemChanged" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="-1,20,0,0" ScrollBar.Scroll="TvProperties_Scroll" >

                    <!--<TreeView Height="{Binding Path=row0}" BorderThickness="0"  Background="Transparent" x:Name="tvProperties" Width="260" SelectedItemChanged="tvProperties_SelectedItemChanged" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="-1,0,0,0">-->                   
                        <TreeView.ItemContainerStyle>
                        <Style TargetType="{x:Type TreeViewItem}">
                            <Setter Property="IsExpanded" Value="{Binding IsExpanded}"></Setter>
                            <Setter Property="TextBlock.Foreground" Value="White"/>
                        </Style>
                        
                    </TreeView.ItemContainerStyle>
                    <TreeView.ItemTemplate>
                        <HierarchicalDataTemplate  ItemsSource="{Binding Path=Children}">
                            <StackPanel Orientation="Horizontal">
                                <Image VerticalAlignment="Center" Source="{Binding Icon}" Width="16" Height="16" Margin="0,0,2,2"></Image>
                                <TextBlock VerticalAlignment="Center" Name="nodeName" Text="{Binding DisplayName}"></TextBlock>
                                <Image VerticalAlignment="Center" Source="{Binding EditIcon}" Margin="2,0,0,0"></Image>
                            </StackPanel>
                            
                        </HierarchicalDataTemplate>
                    </TreeView.ItemTemplate>
                    </TreeView>
                    
                <StackPanel Grid.Row="1" Orientation="Horizontal" HorizontalAlignment="Center" VerticalAlignment="Center">
                    <Label Content="起始时间:"   FontSize="14"  TextBlock.Foreground="White"/>
                    <StartView:DateTimePicker x:Name="dtStart" FontSize="14" TextBlock.Foreground="White"/>
                </StackPanel>
                <StackPanel Grid.Row="2" Orientation="Horizontal" HorizontalAlignment="Center" VerticalAlignment="Center">
                    <Label Content="结束时间:" FontSize="14" TextBlock.Foreground="White"/>
                    <View:DateTimePicker x:Name="dtEnd" FontSize="14" TextBlock.Foreground="White"/>
                </StackPanel>
                <StackPanel Grid.Row="3" Orientation="Horizontal" FlowDirection="LeftToRight" VerticalAlignment="Center" HorizontalAlignment="Center">
                    <Button Name="btDownload"  Style="{StaticResource  buttonDownload}" ToolTip="下载" Click="btDownload_Click" Width="105" Height="36" Margin="0,0,4,0">
                    </Button>
                    <Button Name="btDownloadMgr"  Style="{StaticResource  buttonDownloadMgr}" ToolTip="下载管理" Click="btDownloadMgr_Click" Width="105" Height="36" >
                    </Button>
                </StackPanel>
            </Grid>

这是这个是整个的gird的xaml，谢谢你简洁的代码。我再检查一下