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

ViewModels/MainViewModel.cs

@@ -4,6 +4,7 @@ using CommunityToolkit.Mvvm.Input;
 using CommunityToolkit.Mvvm.Messaging;
 using PMSWPF.Data.Entities;
 using PMSWPF.Data.Repositories;
+using PMSWPF.Enums;
 using PMSWPF.Message;
 using PMSWPF.Models;
 using PMSWPF.Services;
@@ -13,6 +14,7 @@ namespace PMSWPF.ViewModels;
 public partial class MainViewModel : ViewModelBase
 {
     private readonly NavgatorServices _navgatorServices;
+    private readonly DataServices _dataServices;
 
     [ObservableProperty] private ViewModelBase currentViewModel;
     [ObservableProperty]
@@ -20,32 +22,26 @@ public partial class MainViewModel : ViewModelBase
 
     private readonly MenuRepository _menuRepository;
 
-    public MainViewModel(NavgatorServices navgatorServices)
+    public MainViewModel(NavgatorServices navgatorServices,DataServices dataServices)
     {
         _navgatorServices = navgatorServices;
-        _menuRepository = new MenuRepository();
+        _dataServices = dataServices;
+
         _navgatorServices.OnViewModelChanged += () => { CurrentViewModel = _navgatorServices.CurrentViewModel; };
         CurrentViewModel = new HomeViewModel();
         CurrentViewModel.OnLoaded();
         
-        WeakReferenceMessenger.Default.Register<UpdateMenuMessage>( this,UpdateMenu);
+        WeakReferenceMessenger.Default.Send<LoadMessage>(new LoadMessage(LoadTypes.Menu));
+        dataServices.OnMenuListChanged += (menus) =>
+        {
+            Menus = new ObservableCollection<MenuBean>(menus);
+        };
+
+    }
+
+
+    public override void OnLoaded()
+    {
         
     }
-
-    private async void UpdateMenu(object recipient, UpdateMenuMessage message)
-    {
-       await  LoadMenu();
-    }
-
-
-    public override async void OnLoaded()
-    {
-        await LoadMenu();
-    }
-
-    private async Task LoadMenu()
-    {
-        var menuList= await _menuRepository.GetMenu();
-        Menus=new ObservableCollection<MenuBean>(menuList);
-    }
 }