具备界面基础功能

SHH.CameraDashboard/Core/ThemeManager.cs

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+using System.Windows;
+
+namespace SHH.CameraDashboard
+{
+    public static class ThemeManager
+    {
+        // 使用字典：Key=主题名, Value=路径
+        private static readonly Dictionary<string, string> _themeMap = new Dictionary<string, string>
+        {
+            { "Dark", "/Style/Themes/Colors.Dark.xaml" },
+            { "Light", "/Style/Themes/Colors.Light.xaml" },
+            // { "Blue", "/Style/Themes/Colors.Blue.xaml" } 
+        };
+
+        // 当前主题名称
+        public static string CurrentThemeName { get; private set; } = "Dark";
+
+        /// <summary>
+        /// 指定切换到某个主题
+        /// </summary>
+        /// <param name="themeName">主题名称 (Dark, Light...)</param>
+        public static void SetTheme(string themeName)
+        {
+            if (!_themeMap.ContainsKey(themeName))
+            {
+                System.Diagnostics.Debug.WriteLine($"未找到主题: {themeName}");
+                return;
+            }
+
+            ApplyTheme(_themeMap[themeName]);
+            CurrentThemeName = themeName;
+        }
+
+        /// <summary>
+        /// 循环切换下一个主题 (保留旧功能)
+        /// </summary>
+        public static void SwitchToNextTheme()
+        {
+            // 获取所有 Key 的列表
+            var keys = _themeMap.Keys.ToList();
+
+            // 找到当前 Key 的索引
+            int index = keys.IndexOf(CurrentThemeName);
+
+            // 计算下一个索引
+            index++;
+            if (index >= keys.Count) index = 0;
+
+            // 切换
+            SetTheme(keys[index]);
+        }
+
+        /// <summary>
+        /// 私有方法：执行具体的资源替换
+        /// </summary>
+        private static void ApplyTheme(string themePath)
+        {
+            var appResources = Application.Current.Resources;
+            ResourceDictionary oldDict = null;
+
+            // 查找旧的皮肤字典
+            foreach (var dict in appResources.MergedDictionaries)
+            {
+                if (dict.Source != null && dict.Source.OriginalString.Contains("/Themes/Colors."))
+                {
+                    oldDict = dict;
+                    break;
+                }
+            }
+
+            // 移除旧的
+            if (oldDict != null)
+            {
+                appResources.MergedDictionaries.Remove(oldDict);
+            }
+
+            // 加载新的
+            try
+            {
+                var newDict = new ResourceDictionary
+                {
+                    Source = new Uri(themePath, UriKind.Relative)
+                };
+                appResources.MergedDictionaries.Add(newDict);
+            }
+            catch (Exception ex)
+            {
+                System.Diagnostics.Debug.WriteLine($"加载主题文件失败: {ex.Message}");
+            }
+        }
+    }
+}