清理引用，将NavigatorServices更改为使用Message来实现导航的切换

ViewModels/MainViewModel.cs

@@ -1,42 +1,23 @@
 using CommunityToolkit.Mvvm.ComponentModel;
-using CommunityToolkit.Mvvm.Messaging;
-using PMSWPF.Data.Entities;
-using PMSWPF.Message;
-using System.Collections.ObjectModel;
 using PMSWPF.Services;
 
-namespace PMSWPF.ViewModels
+namespace PMSWPF.ViewModels;
+
+public partial class MainViewModel : ViewModelBase
 {
-   public partial class MainViewModel : ObservableRecipient, IRecipient<MyMessage>
+    private readonly NavgatorServices _navgatorServices;
+
+    [ObservableProperty] private ViewModelBase currentViewModel;
+
+    public MainViewModel(NavgatorServices navgatorServices)
     {
-        private readonly NavgatorServices _navgatorServices;
-
-        [ObservableProperty]
-       private ViewModelBase currentViewModel;
-        public MainViewModel(NavgatorServices navgatorServices)
-        {
-            _navgatorServices = navgatorServices;
-            _navgatorServices.OnViewModelChanged += () =>
-            {
-                CurrentViewModel = _navgatorServices.CurrentViewModel;
-            };
-            IsActive = true;
-            CurrentViewModel = new HomeViewModel();
-        }
-
-        public void NavgateTo<T>() where T : ViewModelBase
-        {
-            _navgatorServices.NavigateTo<T>();
-        }
-
-        string text = "Hello Count:";
-
-        [ObservableProperty]
-        string message;
-
-        public void Receive(MyMessage message)
-        {
-            Message = text + message.Count;
-        }
+        _navgatorServices = navgatorServices;
+        _navgatorServices.OnViewModelChanged += () => { CurrentViewModel = _navgatorServices.CurrentViewModel; };
+        CurrentViewModel = new HomeViewModel();
     }
-}
+
+
+    public override void OnLoaded()
+    {
+    }
+}