C# .NET6 WPF 依赖注入

入口文件：App.xaml.cs

using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Serilog;
using System;
using System.IO;
using System.Text;
using System.Windows;

namespace Demo
{
    /// <summary>
    /// Interaction logic for App.xaml
    /// </summary>
    public partial class App : Application
    {
        /// <summary>
        /// 构造函数
        /// </summary>
        public App()
        {
            // 创建服务容器
            var services = new ServiceCollection();
            // 添加服务注册
            ConfigureServices(services);
            // 构建ServiceProvider对象
            ServiceProviderHelper.InitServiceProvider(services.BuildServiceProvider());
            // 注册编码格式
            Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
        }
        /// <summary>
        /// 配置服务
        /// </summary>
        /// <param name="services"></param>
        private static void ConfigureServices(IServiceCollection services)
        {
            // 添加配置文件
            IConfigurationBuilder configurationBuilder = new ConfigurationBuilder()
                .SetBasePath(Directory.GetCurrentDirectory())
                .AddJsonFile("appsettings.json")
                .AddJsonFile($"appsettings.{Environment.GetEnvironmentVariable("DOTNET_ENVIRONMENT")}.json", optional: true, reloadOnChange: false);
            IConfiguration configuration = configurationBuilder.Build();
            services.AddSingleton(configuration);
            // 添加Logger
            services.AddLogging(builder =>
            {
                // 创建Serilog实例
                var serilogLogger = new LoggerConfiguration()
                    .ReadFrom.Configuration(configuration)
                    .Enrich.FromLogContext()
                    .CreateLogger();
                // 添加Serilog
                builder.AddSerilog(logger: serilogLogger, dispose: true);
            });
            // 添加数据库上下文
            services.AddDbContext<SqliteContext>(options => options.UseSqlite(configuration["ConnectionStrings:SQLite"]));
            // 添加自定义接口和服务
            services.AddAppServices();
        }
        /// <summary>
        /// 程序启动
        /// </summary>
        /// <param name="e"></param>
        protected override void OnStartup(StartupEventArgs e)
        {
            // 获取启动窗口
            var window = ServiceProviderHelper.GetWindow<MainWindow>();
            window.Show();
        }
        /// <summary>
        /// 程序退出
        /// </summary>
        /// <param name="e"></param>
        protected override void OnExit(ExitEventArgs e)
        {

        }
    }
}

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全局服务帮助类：ServiceProviderHelper.cs

using Microsoft.Extensions.DependencyInjection;
using System;
using System.Windows;

namespace Demo
{
    /// <summary>
    /// 全局服务帮助类
    /// </summary>
    public static class ServiceProviderHelper
    {
        /// <summary>
        /// 全局服务提供者
        /// </summary>
        public static IServiceProvider ServiceProvider { get; private set; } = null!;
        /// <summary>
        /// 初始化构建ServiceProvider对象
        /// </summary>
        /// <param name="serviceProvider"></param>
        /// <exception cref="ArgumentNullException"></exception>
        public static void InitServiceProvider(ServiceProvider serviceProvider)
        {
            ArgumentNullException.ThrowIfNull(serviceProvider, nameof(serviceProvider));
            ServiceProvider = serviceProvider;
        }
        /// <summary>
        /// 获取Window窗口
        /// </summary>
        /// <param name="type"></param>
        /// <returns></returns>
        /// <exception cref="ArgumentException"></exception>
        public static T GetWindow<T>() where T : Window
        {
            var service = ServiceProvider.GetRequiredService<T>();
            if (service != null && service is Window)
            {
                return service;
            }
            else
            {
                throw new ArgumentException($"{typeof(T).FullName} is not a Window");
            }
        }
        /// <summary>
        /// 获取服务
        /// </summary>
        /// <param name="type"></param>
        /// <returns></returns>
        /// <exception cref="ArgumentException"></exception>
        public static T GetService<T>() where T : notnull
        {
            return ServiceProvider.GetRequiredService<T>();
        }
    }
}

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添加自定义接口和服务的类：AppServices.cs

using Microsoft.Extensions.DependencyInjection;

namespace Demo
{
    /// <summary>
    /// 添加自定义接口和服务的类
    /// </summary>
    public static class AppServices
    {
        /// <summary>
        /// 添加自定义接口和服务
        /// </summary>
        /// <param name="services"></param>
        /// <returns></returns>
        public static IServiceCollection AddAppServices(this IServiceCollection services)
        {
            // 接口
            services.AddTransient<ISqliteService, SqliteService>();
            // 类
            services.AddScoped(typeof(Manage));
            // 窗口
            services.AddSingleton(typeof(MainWindow));
            services.AddTransient(typeof(BaseWindow));
            // 返回
            return services;
        }
    }
}