实现了导航功能

Services/NavgatorServices.cs

@@ -0,0 +1,29 @@
+using System.ComponentModel;
+using System.Windows;
+using Microsoft.Extensions.DependencyInjection;
+using PMSWPF.ViewModels;
+
+namespace PMSWPF.Services;
+
+public class NavgatorServices
+{
+    private ViewModelBase currentViewModel;
+
+    public ViewModelBase CurrentViewModel
+    {
+        get { return currentViewModel; }
+        set
+        {
+            currentViewModel = value; 
+            OnViewModelChanged?.Invoke();
+        }
+    }
+
+    public event Action OnViewModelChanged ;
+
+    public void NavigateTo<T>() where T : ViewModelBase
+    {
+        // Application.Current
+        CurrentViewModel = App.Current.Services.GetService<T>();
+    }
+}