添加项目文件。

BaseFrame/ViewModels/DialogViewModelBase.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ECCS.ViewModels
+{
+    public abstract class DialogViewModelBase : BindableBase,IDialogAware
+    {
+        public IEventAggregator _eventAggregator;
+        public DialogCloseListener RequestClose { get; set; }
+        public DialogViewModelBase(IContainerProvider containerProvider)
+        {
+            _eventAggregator = containerProvider.Resolve<IEventAggregator>();
+        }
+        #region Dialog
+
+        public virtual bool CanCloseDialog() => true;
+        public virtual void OnDialogClosed() { }
+        public virtual void OnDialogOpened(IDialogParameters parameters) { }
+        #endregion
+    }
+}