添加项目文件。

OrpaonEMS.Core/NavigationViewModel.cs

@@ -0,0 +1,46 @@
+using Prism.Mvvm;
+using Prism.Regions;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OrpaonEMS.Core
+{
+    /// <summary>
+    /// 导航的基类
+    /// </summary>
+    public class NavigationViewModel : BindableBase, INavigationAware
+    {
+        /// <summary>
+        /// 是否重用导航对象
+        /// </summary>
+        /// <param name="navigationContext"></param>
+        /// <returns></returns>
+        public virtual bool IsNavigationTarget(NavigationContext navigationContext)
+        {
+            return true;
+        }
+
+        /// <summary>
+        /// 导航被切换触发
+        /// </summary>
+        /// <param name="navigationContext"></param>
+        /// <exception cref="NotImplementedException"></exception>
+        public virtual void OnNavigatedFrom(NavigationContext navigationContext)
+        {
+
+        }
+
+        /// <summary>
+        /// 导航被执行触发
+        /// </summary>
+        /// <param name="navigationContext"></param>
+        /// <exception cref="NotImplementedException"></exception>
+        public virtual void OnNavigatedTo(NavigationContext navigationContext)
+        {
+
+        }
+    }
+}