添加项目文件。

WPFWCSDemo/ViewModels/Settings/SkinViewModel.cs

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+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using MaterialDesignColors;
+using MaterialDesignColors.ColorManipulation;
+using MaterialDesignThemes.Wpf;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Controls;
+using System.Windows.Media;
+
+namespace WPFWCSDemo.ViewModels.Settings
+{
+    public partial class SkinViewModel:ObservableObject
+    {
+        [ObservableProperty]
+        static Frame frame;
+
+        public IEnumerable<ISwatch> Swatches { get; } = SwatchHelper.Swatches;
+
+
+        //深浅色切换
+        private bool _isDarkTheme;
+        public bool IsDarkTheme
+        {
+            get => _isDarkTheme;
+            set
+            {
+                if (SetProperty(ref _isDarkTheme, value))
+                {
+                    ModifyTheme(theme => theme.SetBaseTheme(value ? Theme.Dark : Theme.Light));
+                }
+            }
+        }
+        //切换主题
+        private static void ModifyTheme(Action<ITheme> modificationAction)
+        {
+            var paletteHelper = new PaletteHelper();
+            ITheme theme = paletteHelper.GetTheme();
+
+            modificationAction?.Invoke(theme);
+
+            paletteHelper.SetTheme(theme);
+        }
+
+
+
+        private readonly PaletteHelper paletteHelper = new PaletteHelper();
+
+        /// <summary>
+        /// 改变颜色
+        /// </summary>
+        /// <param name="obj"></param>
+        [RelayCommand]
+        public void ChangeHue(object? obj)
+        {
+            var hue = (Color)obj!;
+
+            ITheme theme = paletteHelper.GetTheme();
+
+            theme.PrimaryLight = new ColorPair(hue.Lighten());
+            theme.PrimaryMid = new ColorPair(hue);
+            theme.PrimaryDark = new ColorPair(hue.Darken());
+
+            paletteHelper.SetTheme(theme);
+        }
+
+
+        public static void GetFrame(Frame navigationFrame)
+        {
+            frame = navigationFrame;
+        }
+
+    }
+}