wpf 如何以编程方式更改 ItemContainerStyle 中的边框背景颜色？
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How to change the Border Background Color in a ItemContainerStyle programmatically?
提问by Dirk Schiller
I have a TreeView and it's own Style and it's own ItemContainerStyle. In the ItemContainerStyle I have a Border with the Name "SelectedRectangle". Now I want to change the Background Color of this "SelectedRectangle" by using this Code (I found it in the Internet):
我有一个 TreeView，它有自己的 Style 和它自己的 ItemContainerStyle。在 ItemContainerStyle 我有一个名为“SelectedRectangle”的边框。现在我想使用此代码更改此“SelectedRectangle”的背景颜色（我在 Internet 上找到了它）：
Border brd = (Border)lstDbTree.Template.FindName("SelectedRectangle", lstDbTree); //dosnt work - returns 'null'
brd.Background = new SolidColorBrush((Color)ColorConverter.ConvertFromString("#7B7A7C")); // Null Pointer Exception
I don't know how I can get access to the ItemContainerStyle XAML to manipulate it programmatically.
我不知道如何访问 ItemContainerStyle XAML 来以编程方式操作它。
The Code:
编码：
Shell.xaml
外壳.xaml
<TreeView DockPanel.Dock="Bottom" Name="lstDbTree"
...
ItemContainerStyle="{StaticResource DbTreeItemStyle}"
...
/>
CoreStyles.xaml
核心样式.xaml
<Style TargetType="TreeViewItem" x:Key="DbTreeItemStyle">
<Setters...>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="TreeViewItem">
...
<Border x:Name="SelectedRectangle" BorderBrush="#44ffffff" BorderThickness="1" Grid.Column="1" CornerRadius="1" IsHitTestVisible="False" Opacity="0" Background="#555355"/>
...
</ControlTemplate>
</Setter.Value>
</Style
Shell.xaml.cs
外壳.xaml.cs
private void ColorB_OnClick(object sender, RoutedEventArgs e)
{
Border brd = (Border)lstDbTree.Template.FindName("SelectedRectangle", lstDbTree); //dosnt work
brd.Background = new SolidColorBrush((Color)ColorConverter.ConvertFromString("#7B7A7C"));
}
What I want to do
我想做的事
Thank's a lot for any Help.
非常感谢任何帮助。
回答by Dirk Schiller
I could fix this Issue with the ItemContainerGenerator:
我可以用 ItemContainerGenerator 解决这个问题：
private void ColorB_OnClick(object sender, RoutedEventArgs e)
{
//TODO: Do this for all Items and not only for the "Selected Item"
TreeViewItem tvi = lstDbTree.ItemContainerGenerator.ContainerFromItem(lstDbTree.SelectedItem) as TreeViewItem;
Border brd = (Border)tvi.Template.FindName("SelectedRectangle", tvi);
brd.Background = new SolidColorBrush((Color)ColorConverter.ConvertFromString("#7B7A7C"));
}
