添加项目文件。

App.xaml

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+<Application
+    x:Class="PMSWPF.App"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="clr-namespace:PMSWPF">
+    <Application.Resources />
+</Application>

App.xaml.cs

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+using System.Configuration;
+using System.Data;
+using System.Windows;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using PMSWPF.Services;
+using PMSWPF.ViewModels;
+using PMSWPF.Views;
+
+namespace PMSWPF
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+        [STAThread]
+        static void Main(string[] args)
+        {
+            using IHost host = CreateHostBuilder(args).Build();
+            host.Start();
+            App app = new App();
+            app.InitializeComponent();
+            app.MainWindow = host.Services.GetRequiredService<MainView>();
+            app.MainWindow.Visibility = Visibility.Visible;
+            app.Run();
+
+        }
+
+        private static IHostBuilder CreateHostBuilder(string[] args)
+        {
+            return Host.CreateDefaultBuilder(args).ConfigureServices(services =>
+            {
+
+                services.AddHostedService<DemoBackgroundService>();
+                services.AddSingleton<MainView>();
+                services.AddSingleton<MainViewModel>();
+            });
+        }
+    }
+
+}

AssemblyInfo.cs

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+using System.Windows;
+
+[assembly: ThemeInfo(
+    ResourceDictionaryLocation.None,            //where theme specific resource dictionaries are located
+                                                //(used if a resource is not found in the page,
+                                                // or application resource dictionaries)
+    ResourceDictionaryLocation.SourceAssembly   //where the generic resource dictionary is located
+                                                //(used if a resource is not found in the page,
+                                                // app, or any theme specific resource dictionaries)
+)]

Data/DbContext.cs

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+using SqlSugar;
+
+namespace PMSWPF.Data
+{
+    internal class DbContext
+    {
+        private static SqlSugarClient _db;
+
+        public static SqlSugarClient GetInstance()
+        {
+            if (_db == null)
+            {
+                string connectionString = "server=127.0.0.1;port=3306;user=root;password=Pgw15221236646; database=PMS;";
+                _db = new SqlSugarClient(new ConnectionConfig()
+                {
+                    ConnectionString = connectionString,
+                    DbType = DbType.MySql, // 根据实际数据库类型修改，如DbType.MySql等
+                    IsAutoCloseConnection = true,
+                    InitKeyType = InitKeyType.Attribute
+                });
+            }
+            return _db;
+        }
+    }
+}

Message/MyMessage.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using CommunityToolkit.Mvvm.Messaging.Messages;
+
+namespace PMSWPF.Message
+{
+    public class MyMessage : ValueChangedMessage<int>
+    {
+        private int count;
+
+        public MyMessage(int value) : base(value)
+        {
+        }
+
+        public int Count { get => count; set => count = value; }
+    }
+}

Message/ReqMessage.cs

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+using CommunityToolkit.Mvvm.Messaging.Messages;
+
+namespace PMSWPF.Message
+{
+    public class ReqMessage : RequestMessage<int>
+    {
+        public int Count { get; set; }
+        public ReqMessage(int count)
+        {
+            Count = count;
+        }
+    }
+}

PMSWPF.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net8.0-windows</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <UseWPF>true</UseWPF>
+  </PropertyGroup>
+
+	<ItemGroup>
+		<ApplicationDefinition Remove="App.xaml" />
+		<Page Include="App.xaml" />
+	</ItemGroup>
+	<ItemGroup>
+		<PackageReference Include="CommunityToolkit.Mvvm" Version="8.4.0" />
+		<PackageReference Include="HandyControl" Version="3.5.1" />
+		<PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="9.0.5" />
+		<PackageReference Include="Microsoft.Extensions.Hosting" Version="9.0.5" />
+		<PackageReference Include="Microsoft.Xaml.Behaviors.Wpf" Version="1.1.135" />
+		<PackageReference Include="SqlSugarCore.MySql" Version="5.1.4.178" />
+		<PackageReference Include="SqlSugarCoreNoDrive" Version="5.1.4.193" />
+	</ItemGroup>
+	<ItemGroup>
+	  <Folder Include="Data\Entities\" />
+	  <Folder Include="Data\Repositories\" />
+	  <Folder Include="Models\" />
+	  <Folder Include="Resources\" />
+	</ItemGroup>
+
+</Project>

PMSWPF.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.12.35728.132 d17.12
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PMSWPF", "PMSWPF.csproj", "{CD3529C9-218C-41EE-B64B-A884DC56E21E}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{CD3529C9-218C-41EE-B64B-A884DC56E21E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{CD3529C9-218C-41EE-B64B-A884DC56E21E}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{CD3529C9-218C-41EE-B64B-A884DC56E21E}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{CD3529C9-218C-41EE-B64B-A884DC56E21E}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal

Services/DemoBackgroundService.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Messaging;
+using Microsoft.Extensions.Hosting;
+using PMSWPF.Message;
+
+namespace PMSWPF.Services
+{
+    internal class DemoBackgroundService : BackgroundService
+    {
+        int count = 0;
+
+        public DemoBackgroundService()
+        {
+
+        }
+
+
+
+        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+        {
+
+            while (!stoppingToken.IsCancellationRequested)
+            {
+                await Task.Delay(1000);
+                count += 1;
+                var msg = new MyMessage(35) { Count = count };
+                WeakReferenceMessenger.Default.Send<MyMessage>(msg);
+                Console.WriteLine("Hello");
+            }
+        }
+    }
+}

ViewModels/MainViewModel.cs

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+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Messaging;
+using PMSWPF.Message;
+
+namespace PMSWPF.ViewModels
+{
+    partial class MainViewModel : ObservableRecipient, IRecipient<MyMessage>
+    {
+        public MainViewModel()
+        {
+            IsActive = true;
+        }
+
+        string text = "Hello Count:";
+
+        [ObservableProperty]
+        string message;
+
+        public void Receive(MyMessage message)
+        {
+            Message = text + message.Count;
+        }
+    }
+}

Views/MainView.xaml

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+<Window
+    x:Class="PMSWPF.Views.MainView"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:i="http://schemas.microsoft.com/xaml/behaviors"
+    xmlns:local="clr-namespace:PMSWPF.Views"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    xmlns:vm="clr-namespace:PMSWPF.ViewModels"
+    Title="MainView"
+    Width="800"
+    Height="450"
+    d:DataContext="{d:DesignInstance vm:MainViewModel}"
+    mc:Ignorable="d">
+    <StackPanel>
+        <TextBlock
+            HorizontalAlignment="Center"
+            FontSize="36"
+            Text="{Binding Message}" />
+
+        <Border
+            Width="100"
+            Height="100"
+            Background="Orange">
+            <i:Interaction.Behaviors>
+                <i:MouseDragElementBehavior />
+            </i:Interaction.Behaviors>
+        </Border>
+    </StackPanel>
+</Window>

Views/MainView.xaml.cs

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+using System.Windows;
+using PMSWPF.ViewModels;
+
+namespace PMSWPF.Views
+{
+    /// <summary>
+    /// MainView.xaml 的交互逻辑
+    /// </summary>
+    public partial class MainView : Window
+    {
+        public MainView()
+        {
+            InitializeComponent();
+            this.DataContext = new MainViewModel();
+        }
+    }
+}