设置启动机制，等待测试

软件系统服务端Wpf/App.xaml

@@ -1,9 +1,17 @@
 <Application x:Class="软件系统服务端Wpf.App"
              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-             xmlns:local="clr-namespace:软件系统服务端Wpf"
-             StartupUri="MainWindow.xaml">
+             xmlns:local="clr-namespace:软件系统服务端Wpf">
     <Application.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
 
+                <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Light.xaml" />
+                <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Defaults.xaml" />
+                <ResourceDictionary Source="pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Primary/MaterialDesignColor.DeepPurple.xaml" />
+                <ResourceDictionary Source="pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Accent/MaterialDesignColor.Lime.xaml" />
+
+            </ResourceDictionary.MergedDictionaries>
+        </ResourceDictionary>
     </Application.Resources>
 </Application>

软件系统服务端Wpf/App.xaml.cs

@@ -2,7 +2,10 @@
 using System.Collections.Generic;
 using System.Configuration;
 using System.Data;
+using System.Diagnostics;
 using System.Linq;
+using System.Runtime.InteropServices;
+using System.Threading;
 using System.Threading.Tasks;
 using System.Windows;
 
@@ -13,9 +16,66 @@ namespace 软件系统服务端Wpf
     /// </summary>
     public partial class App : Application
     {
+        /// <summary>
+        /// 指示了应用程序退出时的代码
+        /// </summary>
+        public static int QuitCode { get; set; } = 0;
+
+
         protected override void OnStartup(StartupEventArgs e)
         {
             base.OnStartup(e);
+            //捕获未处理的异常
+            AppDomain.CurrentDomain.UnhandledException += CurrentDomain_UnhandledException;
+
+            Process process = Process.GetCurrentProcess();
+            //遍历应用程序的同名进程组
+            foreach (Process p in Process.GetProcessesByName(process.ProcessName))
+            {
+                //不是同一进程则关闭刚刚创建的进程
+                if (p.Id != process.Id)
+                {
+                    //此处显示原先的窗口需要一定的时间，不然无法显示
+                    ShowWindowAsync(p.MainWindowHandle, 9);
+                    SetForegroundWindow(p.MainWindowHandle);
+                    Thread.Sleep(10);
+                    Current.Shutdown();//关闭当前的应用程序
+                    return;
                 }
             }
+
+
+            P1:
+
+            LoginWindow lw = new LoginWindow();
+            if (lw.ShowDialog().Value == true)
+            {
+                MainWindow mw=new MainWindow();
+                MainWindow = mw;
+                mw.ShowDialog();
+                if (QuitCode == 1)
+                {
+                    //继续显示登录窗口
+                    QuitCode = 0;
+                    goto P1;
+                }
+            }
+            else
+            {
+                Environment.Exit(0);
+            }
+
+        }
+
+        private void CurrentDomain_UnhandledException(object sender, UnhandledExceptionEventArgs e)
+        {
+            
+        }
+
+        [DllImport("User32.dll")]
+        private static extern bool ShowWindowAsync(IntPtr hWnd, int cmdShow);
+
+        [DllImport("User32.dll")]
+        private static extern bool SetForegroundWindow(IntPtr hWnd);
+    }
 }

软件系统服务端Wpf/LoginWindow.xaml

@@ -3,10 +3,27 @@
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
-        xmlns:local="clr-namespace:软件系统服务端Wpf"
         mc:Ignorable="d"
-        Title="LoginWindow" Height="300" Width="500">
+        Title="LoginWindow" Height="300" Width="500" WindowStartupLocation="CenterScreen">
+    <Window.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Button.xaml" />
+                <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.CheckBox.xaml" />
+                <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.ListBox.xaml" />
+                <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.PopupBox.xaml" />
+                <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.RadioButton.xaml" />
+                <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.TextBlock.xaml" />
+                <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.ToggleButton.xaml" />
+            </ResourceDictionary.MergedDictionaries>
+        </ResourceDictionary>
+    </Window.Resources>
     <Grid>
-        
+        <StackPanel>
+            <Button Style="{StaticResource MaterialDesignRaisedLightButton}" Margin="0 12 8 0" Width="100"
+                    ToolTip="随便测试下" Click="Button_Click">
+                点击进入
+            </Button>
+        </StackPanel>
     </Grid>
 </Window>

软件系统服务端Wpf/LoginWindow.xaml.cs

@@ -23,5 +23,10 @@ namespace 软件系统服务端Wpf
         {
             InitializeComponent();
         }
+
+        private void Button_Click(object sender, RoutedEventArgs e)
+        {
+            this.DialogResult = true;
+        }
     }
 }