如何突出显示TreeViewItem？

Question

I have a simple treeview with all the default colors. When you click on an item it is highlighted and the background turns blue. Fine so far. I'm trying to do the same thing in the code behind so that I can have a treeview item of my choice highlighted in blue. The only property I see that I have found that changes the background is ".IsSelected". But when I set that to true the treeview item is highlighted in white. I don't get it. I'm not setting the highlight color to anything so why would it pick a different highlight color than when you select that same item with a mouse click? Is "highlight" a different property than "select" and if so how what is the name of that property?

Thanks.

Edit: Adding code (My apologies, this was so simple so I didn't think anyone would want to see the code)

Xaml: (and yes, this the entire code. Just plug it into a project and it'll run.)

 <Window x:Class="TestTreeView.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Tree View Icon"
ShowInTaskbar="false"
Name ="MyTestTreeView"
Background="Beige"
Width="500"
Height ="500"
>
<StackPanel Name="stackpanel">
    <Button Name="AddNode" Click="btnClick">
            AddNode
    </Button>

    <ScrollViewer HorizontalScrollBarVisibility="auto" VerticalScrollBarVisibility="hidden" Name="scrollViewer">
        <TreeView Name="treeView" BorderThickness="0">
            <TreeView.Resources>
                <SolidColorBrush Color="Red" x:Key="{x:Static SystemColors.HighlightBrushKey}"/>
            </TreeView.Resources>
        </TreeView>
    </ScrollViewer>
</StackPanel>

Code behind:

using System.Windows.Shapes;
using System.IO;
namespace TestTreeView
{
    public partial class Window1 : System.Windows.Window
    {
        public Window1()
        {
            InitializeComponent();
        }       
        public void btnClick(object sender, RoutedEventArgs e)
        {
            TreeViewItem n1 = new TreeViewItem();
            n1.Header = "Top Node";
            n1.IsSelected = true;
            n1.Focus();
            treeView.Items.Add(n1);          
        }
    }
}

Answer 1

TreeviewItem.Focus() method would solve your problem. In your code you have missed to set ItemContainerStyle and you have to focus TreeViewItem after adding into the TreeView like below

<Window x:Class="WpfApplication3.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="350" Width="525">
<Window.Resources>
    <Style x:Key="myLBStyle" TargetType="{x:Type TreeViewItem}">
        <Style.Resources>
            <SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" Color="Green" />
            <SolidColorBrush x:Key="{x:Static SystemColors.HighlightTextBrushKey}" Color="Red" />
        </Style.Resources>
    </Style>
</Window.Resources>
<Grid>
    <TreeView Name="Treeview1" ItemContainerStyle="{StaticResource myLBStyle}" />
    <Button Content="Select" Width="300" Height="30" Click="Button_Click_2" />
</Grid>

TreeViewItem n1 = new TreeViewItem();
n1.Header = "Top Node";
n1.IsSelected = true;

Treeview1.Items.Add(n1);
n1.Focus();

Answer 2

使用TreeViewItem的Focus（）方法。

Answer 3

I believe the most maintainable approach would require you to set the SelectedItem or SelectedValue on your TreeView to be one of the items of interest in your ItemsSource for the control. If you are using bindings, this should be very easy to do -- just update the respective property on your ViewModel.

This is what you need to do if you are trying to mimic the user picking an item from your list. Let me know if I am incorrect or if you need more guidance, but we will need more code/examples from you first most likely.