添加项目文件。

SamplePreSystemApp/LoginWindow.xaml.cs

@@ -0,0 +1,51 @@
+using SamplePre.ProcessBll.BLL;
+using SamplePreSystem.UI.ViewModel.Login;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Shapes;
+
+namespace SamplePreSystemApp
+{
+    /// <summary>
+    /// LoginWindow.xaml 的交互逻辑
+    /// </summary>
+    public partial class LoginWindow : Window
+    {
+       
+        public LoginWindow()
+        {
+            InitializeComponent();
+
+            var vm = new LoginViewModel();
+
+            vm.ColseAction = (val) => DialogResult = val;
+
+            vm.SaveUserAction = (username)=>{
+
+                Properties.Settings.Default.UserName = username;
+                // 用户持久化保存
+                Properties.Settings.Default.Save();
+            };
+
+            this.DataContext = vm;
+
+            // 读取项目设置中保存的用户名
+            string savedUserName = Properties.Settings.Default.UserName;
+            if(!string.IsNullOrEmpty(savedUserName))
+            {
+                vm.UserName = savedUserName;
+            }
+        }
+
+    }
+}