使用绑定到控件的键覆盖控件样式

所以在我的主应用程序ResourceDictionary中，我有一个以它开头的样式

<Style TargetType="{x:Type TabItem}" x:Key="{x:Type TabItem}">

现在我正在做的是重写TabControl以进行自定义控件（没有任何xaml） . 此问题是此时它不继承自定义TabControl模板 .

所以我想知道的是，我怎么能以编程方式绑定到模板的'x：Key'，考虑到绑定到特定控件而不让我的控件有一个xaml文件 .

网上的一些地方说这样做

this.Style = (Style)FindResource("TabItem");

但它似乎在我的情况下不起作用 . 'style'位于一个单独的文件中，并导入到我的App.Xaml资源字典中...所以它会正确覆盖所有TabItem，但不会覆盖我覆盖的那个 .

这是我的App.xaml

<Application x:Class="Octgn.OctgnApp" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

  <Application.Resources>
    <ResourceDictionary>
      <ResourceDictionary.MergedDictionaries>

        <ResourceDictionary Source="/Resources/Themes/Full/ExpressionDark.xaml"/>
       </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
  </Application.Resources>
</Application>

并且ExpressionDark.xaml中的项目（略微截断导致它很大）

<Style d:IsControlPart="True" TargetType="{x:Type TabItem}" x:Key="{x:Type TabItem}">
    <Setter Property="Foreground" Value="{DynamicResource TextBrush}" />
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type TabItem}">
                <Grid x:Name="grid" Margin="2,1,2,3">
                    <Grid.LayoutTransform>
                        <TransformGroup>
                            <ScaleTransform ScaleX="1" ScaleY="1"/>
                            <SkewTransform AngleX="0" AngleY="0"/>
                            <RotateTransform Angle="0"/>
                            <TranslateTransform X="0" Y="0"/>
                        </TransformGroup>
                    </Grid.LayoutTransform>
                    <Border x:Name="border" BorderBrush="{x:Null}" CornerRadius="2,2,2,2" Opacity="0.5">
                        <Border.Background>
                            <LinearGradientBrush EndPoint="0.5,0.976" StartPoint="0.5,0.039">
                                <GradientStop Color="#7F595959" Offset="0" />
                                <GradientStop Color="#19FFFFFF" Offset="1" />
                            </LinearGradientBrush>
                        </Border.Background>
                    </Border>
                    <Border x:Name="SelectedBorder" BorderBrush="{x:Null}" CornerRadius="2,2,2,2" Opacity="0" Background="{DynamicResource SelectedBackgroundBrush}"/>
                    <Border x:Name="HoverBorder" BorderBrush="{x:Null}" CornerRadius="2,2,2,2" Opacity="0">
                        <Border.Background>
                            <LinearGradientBrush EndPoint="0.5,0.976" StartPoint="0.5,0.039">
                                <GradientStop Color="#7F595959" Offset="0" />
                                <GradientStop Color="#19FFFFFF" Offset="1" />
                            </LinearGradientBrush>
                        </Border.Background>
                    </Border>
                    <Grid>
                        <ContentPresenter x:Name="ContentSite" RecognizesAccessKey="True" ContentSource="Header" d:LayoutOverrides="Width, Height" HorizontalAlignment="Center" Margin="6,1,6,1" VerticalAlignment="Center" />
                    </Grid>
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

此样式自动应用于TabItem，但我正在尝试将其应用于我的TabItem覆盖 .

这是代码

/// <summary>
/// The chat bar item.
/// </summary>
public class ChatBarItem : TabItem
{
    /// <summary>
    /// Sets the Chat Room
    /// </summary>
    private readonly NewChatRoom room;

    /// <summary>
    /// Initializes static members of the <see cref="ChatBarItem"/> class.
    /// </summary>
    static ChatBarItem()
    {
        DefaultStyleKeyProperty.OverrideMetadata(
            typeof(ChatBarItem), new FrameworkPropertyMetadata(typeof(TabItem)));
    }   

    /// <summary>
    /// Initializes a new instance of the <see cref="ChatBarItem"/> class.
    /// </summary>
    /// <param name="chatRoom">
    /// The chat Room.
    /// </param>
    public ChatBarItem(NewChatRoom chatRoom)
    {
        this.room = chatRoom;
        this.ConstructControl();
    }

    /// <summary>
    /// Initializes a new instance of the <see cref="ChatBarItem"/> class.
    /// </summary>
    public ChatBarItem()
    {
        this.room = null;
        this.ConstructControl();
    }

    /// <summary>
    /// Constructs this control
    /// </summary>
    private void ConstructControl()
    {
        //this.Background = Brushes.Transparent;
        //this.BorderThickness = new Thickness(0);
        //this.Style = (Style)FindResource("TabItem");
        // this is where I want to set the style of this control

        // Main content object
        var mainBorder = new Border { Margin = new Thickness(5) };

        // Main content grid
        var g = new Grid();
        g.ColumnDefinitions.Add(new ColumnDefinition());
        g.ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(16) });

        // Create item label
        var label = new TextBlock() { VerticalAlignment = VerticalAlignment.Center };
        if (this.IsInDesignMode() || this.room == null)
        {
            label.Inlines.Add(new Run("test"));
        }
        else
        {
            label.Inlines.Add(new Run(this.room.GroupUser.User.User));
        }

        // Create close button
        var borderClose = new Border { Width = 16, Height = 16 };
        var imageClose = new Image()
            {
                Source = new BitmapImage(new Uri("pack://application:,,,/Octgn;component/Resources/close.png")), 
                Stretch = Stretch.Uniform
            };

        // --Add items to items

        // Add close image to closeBorder
        borderClose.Child = imageClose;

        // Add Close 'button' to grid
        g.Children.Add(borderClose);
        Grid.SetColumn(borderClose, 1);

        // Add label to main grid
        g.Children.Add(label);

        // Add main grid to main border
        mainBorder.Child = g;

        // Add main grid to this
        this.Header = mainBorder;
    }
}

如果我有一个用于TabItem的xaml，我可以轻松地去Style =“{DynamicResource {x：Type TabItem}}”（或类似的东西），但我正在以编程方式完成所有操作 .