添加项目文件。

Wpf.Ui.Extend/Controls/FluentWindowEx/FluentWindowEx.xaml

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+<ResourceDictionary
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:controls="http://schemas.lepo.co/wpfui/2022/xaml"
+    xmlns:exc="clr-namespace:Wpf.Ui.Extend.Controls">
+    <Style x:Key="DefaultFluentWindowExStyle" TargetType="{x:Type exc:FluentWindowEx}">
+        <Setter Property="Background" Value="{DynamicResource WindowBackground}" />
+        <Setter Property="Foreground" Value="{DynamicResource WindowForeground}" />
+        <Setter Property="BorderBrush" Value="Transparent" />
+        <Setter Property="BorderThickness" Value="0" />
+        <Setter Property="MinWidth" Value="280" />
+        <Setter Property="Margin" Value="0" />
+        <Setter Property="Padding" Value="0" />
+        <Setter Property="FontSize" Value="{DynamicResource ControlContentThemeFontSize}" />
+        <Setter Property="FontWeight" Value="Normal" />
+        <Setter Property="UseLayoutRounding" Value="True" />
+        <Setter Property="SnapsToDevicePixels" Value="True" />
+        <Setter Property="OverridesDefaultStyle" Value="True" />
+        <Setter Property="Template">
+            <Setter.Value>
+                <ControlTemplate TargetType="{x:Type exc:FluentWindowEx}">
+                    <DockPanel>
+                        <controls:TitleBar
+                            Title="{TemplateBinding Title}"
+                            Background="{TemplateBinding Background}"
+                            DockPanel.Dock="Top"
+                            Icon="{TemplateBinding TitleIcon}" />
+                        <AdornerDecorator>
+                            <controls:ClientAreaBorder
+                                Background="{TemplateBinding Background}"
+                                BorderBrush="{TemplateBinding BorderBrush}"
+                                BorderThickness="{TemplateBinding BorderThickness}">
+                                <ContentPresenter x:Name="ContentPresenter" />
+                            </controls:ClientAreaBorder>
+                        </AdornerDecorator>
+                        <!--<controls:SnackbarPresenter x:Name="SnackbarPresenter" DockPanel.Dock="Bottom" />-->
+                    </DockPanel>
+                </ControlTemplate>
+            </Setter.Value>
+        </Setter>
+    </Style>
+    <Style BasedOn="{StaticResource DefaultFluentWindowExStyle}" TargetType="{x:Type exc:FluentWindowEx}" />
+</ResourceDictionary>

Wpf.Ui.Extend/Controls/FluentWindowEx/FluentWindowEx.xaml.cs

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+using System.Windows;
+
+using Wpf.Ui.Controls;
+
+namespace Wpf.Ui.Extend.Controls;
+public class FluentWindowEx : FluentWindow
+{
+    static FluentWindowEx()
+    {
+        DefaultStyleKeyProperty.OverrideMetadata(typeof(FluentWindowEx), new FrameworkPropertyMetadata(typeof(FluentWindowEx)));
+    }
+    public FluentWindowEx()
+    {
+        //将指定的属性与资源字典中的资源关联起来
+        SetResourceReference(StyleProperty,typeof(FluentWindowEx));
+    }
+    public IconElement TitleIcon
+    {
+        get { return (IconElement)GetValue(TitleIconProperty); }
+        set { SetValue(TitleIconProperty, value); }
+    }
+
+    public static readonly DependencyProperty TitleIconProperty =
+        DependencyProperty.Register(nameof(TitleIcon), typeof(IconElement), typeof(FluentWindowEx), new PropertyMetadata(null));
+    
+    //public override void OnApplyTemplate()
+    //{
+    //    base.OnApplyTemplate();
+    //    var resources = Application.Current.Resources;
+    //    var style = Application.Current.FindResource("DefaultFluentWindowExStyle");
+    //    var style1 = Application.Current.FindResource(typeof(FluentWindowEx));
+    //    this.Style = (Style)FindResource(typeof(FluentWindowEx));
+    //}
+}