转成wpf程序，加界面显示

Model/HostModel.cs

@@ -1,15 +1,24 @@
-using System;
+using Prism.Mvvm;
+using System;
 using System.Collections.Generic;
 using System.Net;
 using System.Text;
 
 namespace OnlineUserPool.Model
 {
-    public class HostModel
+    public class HostModel : BindableBase
     {
         public IPEndPoint IPEndPoint { get; set; }
 
-        public DateTime LastActiveTime { get; set; }
+        private DateTime _LastActiveTime;
+        public DateTime LastActiveTime {
+            get {
+                return _LastActiveTime;
+            } 
+            set {
+                SetProperty(ref _LastActiveTime, value);
+            } 
+        }
         /// <summary>
         /// 地图编号
         /// </summary>