添加项目文件。

BaseFrame/ViewModels/NavigateViewModelBase.cs

@@ -0,0 +1,32 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ECCS.ViewModels
+{
+    public abstract class NavigateViewModelBase : BindableBase, INavigationAware
+    {
+        public DialogCloseListener RequestClose { get; set; }
+        public IEventAggregator _eventAggregator;
+        public IDialogService _dialogService;
+        public NavigateViewModelBase(IContainerProvider containerProvider)
+        {
+            _eventAggregator = containerProvider.Resolve<IEventAggregator>();
+            _dialogService = containerProvider.Resolve<IDialogService>();
+
+        }
+
+        #region Navigation
+
+        public virtual void OnNavigatedTo(NavigationContext navigationContext) { }
+
+        public virtual bool IsNavigationTarget(NavigationContext navigationContext) => true;
+
+        public virtual void OnNavigatedFrom(NavigationContext navigationContext) { }
+
+        #endregion
+    }
+
+}