从代码隐藏设置TreeViewItem的前景色

Question

我需要在运行时为TreeViewControl设置自定义颜色，因此我需要在代码中添加样式。这是我的树控件：

<UserControl x:Class="Client.WPF.CommonControls.Controls.Common.Tree"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:Client.WPF.CommonControls.Controls"
xmlns:sf="http://schemas.syncfusion.com/wpf"
xmlns:vm="clr-namespace:ClientCore.ViewModels;assembly=ClientCore"
xmlns:models="clr-namespace:Client.WPF.CommonControls.Models"
xmlns:metaInfos="clr-namespace:Base.MetaInfos;assembly=PresentationBase"
mc:Ignorable="d" >
<UserControl.DataContext>
<models:TreeViewModel></models:TreeViewModel>
</UserControl.DataContext>

<TreeView Name="TreeViewNodes" ItemsSource="{Binding TopNodes}" SelectedValuePath="{Binding SelectedStarElement}">
<TreeView.ItemTemplate>
<HierarchicalDataTemplate DataType="{x:Type metaInfos:Element}" ItemsSource="{Binding Children}">
<TextBlock Text="{Binding Path=Caption}"
Foreground="Blue"
TextAlignment="Left"
HorizontalAlignment="Left"
VerticalAlignment="Center"
/>
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>

当我用控件构建窗口时，我使用此方法添加样式；

public void AdjustAppearance(Appearance appearance)
{
if (appearance!= null)
{
if (!appearance.BackColor.isEmpty)
{
Background = StyleHelper.GetSolidColor(appearance.BackColor);
TreeViewNodes.Background = StyleHelper.GetSolidColor(appearance.BackColor);
}
else
{
Background = new SolidColorBrush(Colors.White);
TreeViewNodes.Background = new SolidColorBrush(Colors.White);
}
if (!appearance.ForeColor.isEmpty)
{
Foreground = StyleHelper.GetSolidColor(appearance.ForeColor);
TreeViewNodes.Foreground = StyleHelper.GetSolidColor(appearance.ForeColor);
}
if (!appearance.BorderColor.isEmpty)
{
BorderBrush = StyleHelper.GetSolidColor(appearance.BorderColor);
}
if (appearance.BorderThickness >= 0)
{
BorderThickness = new Thickness(appearance.BorderThickness);
}
if (appearance.ForeColor != null && !appearance.ForeColor.isEmpty)
{
//Foreground = StyleHelper.GetSolidColor(appearance.ForeColor);
//TreeViewNodes.Foreground = StyleHelper.GetSolidColor(appearance.ForeColor);
//StyleHelper.SetStyleForControlItemContainerStyle(
//    this, typeof(TextBlock), TextBlock.ForegroundProperty, appearance.ForeColor);
Style textStyle = new Style(typeof(TextBlock));
textStyle.Setters.Add(new Setter(ForegroundProperty, StyleHelper.GetSolidColor(appearance.ForeColor)));
TreeViewNodes.Resources.Add("textStyle", textStyle);
//Foreground = new SolidColorBrush(Colors.Aqua);
//StyleHelper.SetStyleForControlItemContainerStyle(
//    this, typeof(TreeViewItemAdv), TreeViewItemAdv.ForegroundProperty, appearance.ForeColor);
}
if (appearance.FontData.SizeInPoints > 0)
{
FontSize = StyleHelper.PointsToPixels(appearance.FontData.SizeInPoints);
TreeViewNodes.FontSize = StyleHelper.PointsToPixels(appearance.FontData.SizeInPoints);
}
if (!string.IsNullOrEmpty(appearance.FontData.Name))
{
FontFamily = new FontFamily(appearance.FontData.Name);
TreeViewNodes.FontFamily = new FontFamily(appearance.FontData.Name);
}
this.FontWeight = appearance.FontData.Bold ? FontWeights.Bold : FontWeights.Normal;
TreeViewNodes.FontWeight = appearance.FontData.Bold ? FontWeights.Bold : FontWeights.Normal;
this.FontStyle = appearance.FontData.Italic ? FontStyles.Italic : FontStyles.Normal;
TreeViewNodes.FontStyle = appearance.FontData.Italic ? FontStyles.Italic : FontStyles.Normal;
}
}

我尝试过不同的方法，其中一种是：

public static void SetStyleForControlItemContainerStyle(Control control, Type typeOfControl, DependencyProperty property, object value)
{
if (typeOfControl == null) return;
var itemContainerStyle = (control as ItemsControl)?.ItemContainerStyle;
if (itemContainerStyle == null) itemContainerStyle = new Style(typeOfControl);
itemContainerStyle.Setters.Add(new Setter(property, value));
}

有人能为我提供指导吗？我现在感到失落，因为所有其他的财产都在运作。例如，我可以将文本设置为粗体。

感谢您阅读本文。

Answer 1

它不起作用，因为您静态地将TextBlock的颜色设置为Blue。设置TreeViewItem.Foreground不会改变
也不要在C#中创建样式或模板。

不要显式设置TextBlock.Foreground。只需设置TreeViewItem.Foreground。默认情况下，Control.Foreground将由子元素继承。这意味着TextBlock.Foreground将隐式继承TreeViewItem.Foreground。

创建一个资源，作为的默认Style的绑定源，例如TreeViewItem，并将其添加到App.xam中的应用程序的ResourceDictionary。它应该包含布局的所有动态属性，例如颜色、边距、字体、字体大小等。

ThemeProvider.cs

class ThemeProvider : DependencyObject
{
public static readonly DependencyProperty TreeViewItemForegroundProperty = DependencyProperty.Register(
"TreeViewItemForeground",
typeof(Brush),
typeof(ThemeProvider),
new PropertyMetadata(Brushes.Blue));
public Brush TreeViewItemForeground
{
get => (Brush) GetValue(ThemeProvider.TreeViewItemForegroundProperty);
set => SetValue(ThemeProvider.TreeViewItemForegroundProperty, value);
}
}

应用程序xaml

<Application>
<Application.Resources>
<ResourceDictionar>
<ThemeProvider x:Key="ThemeProvider" />
</ResourceDictionar>
</Application.Resources>
<Application>

Tree.xaml

<TreeView Name="TreeViewNodes">
<TreeView.ItemTemplate>
<HierarchicalDataTemplate DataType="{x:Type metaInfos:Element}" ItemsSource="{Binding Children}">
<TextBlock Text="{Binding Path=Caption}"
TextAlignment="Left"
HorizontalAlignment="Left"
VerticalAlignment="Center" />
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
<TreeView.ItemContainerStyle>
<Style TargetType="TreeViewItem">
<Setter Property="Foreground" 
Value="Binding Source={StaticResource ThemeProvider}, Path=TreeViewItemForeground}" />
</Style>
</TreeView.ItemContainerStyle>
</TreeView>

主窗口.xaml.cs

private void AdjustAppearance(Appearance appearance)
{
var themeProvider = Application.Current.Resources["ThemeProvider"] as ThemeProvider;
themeProvider.TreeViewItemForeground = appearance.ForeColor;
}