添加DataService为数据服务类，负责数据的加载工作，通过消息来通知DataService更新数据

Services/DataServices.cs

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+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Messaging;
+using Microsoft.Extensions.Logging;
+using PMSWPF.Data.Repositories;
+using PMSWPF.Enums;
+using PMSWPF.Extensions;
+using PMSWPF.Helper;
+using PMSWPF.Message;
+using PMSWPF.Models;
+
+namespace PMSWPF.Services;
+
+public partial class DataServices:ObservableRecipient,IRecipient<LoadMessage>
+{
+    private readonly ILogger<DataServices> _logger;
+    [ObservableProperty]
+    private List<Device> _devices = new List<Device>();
+    [ObservableProperty]
+    private List<MenuBean> menuBeans = new List<MenuBean>();
+    private readonly DeviceRepository _deviceRepository;
+    private readonly MenuRepository _menuRepository;
+
+    public event Action<List<Device>> OnDeviceListChanged;
+    public event Action<List<MenuBean>> OnMenuListChanged;
+
+
+     partial void OnDevicesChanged(List<Device> devices)
+    {
+        OnDeviceListChanged?.Invoke(devices);
+    }
+
+    partial void OnMenuBeansChanged(List<MenuBean> menuBeans)
+    {
+        OnMenuListChanged?.Invoke(menuBeans);
+    }
+    
+
+    public DataServices(ILogger<DataServices> logger )
+    {
+        _logger = logger;
+        IsActive = true;
+         _deviceRepository = new DeviceRepository();
+         _menuRepository = new MenuRepository();
+
+    }
+
+
+
+    public async void Receive(LoadMessage message)
+    {
+        
+        if (!(message.Value is LoadTypes))
+            throw new ArgumentException($"接受到的加载类型错误：{message.Value}");
+        try
+        {
+
+            switch ((LoadTypes)message.Value )
+            {
+                case LoadTypes.Devices:
+                    Devices= await _deviceRepository.GetAll();
+                    break;
+                case LoadTypes.Menu:
+                    MenuBeans= await _menuRepository.GetMenu();
+                    break;
+            
+            }
+        }
+        catch (Exception e)
+        {
+            NotificationHelper.ShowMessage($"加载数据出现了错误：{e.Message}");
+            _logger.LogError($"加载数据出现了错误：{e.Message}");
+
+        }
+        
+    }
+}