.NET 7 使用自带容器实现依赖注入
需安装nuget包:Microsoft.Extensions.Hosting
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 | using Microsoft.Extensions.DependencyInjection; using Microsoft.Extensions.Hosting; using Microsoft.Extensions.Logging; namespace ConsoleAppDI; public class Program { static void Main( string [] args) { /* // .NET 提供了一个内置的服务容器 IServiceProvider var builder = Host.CreateApplicationBuilder(args); builder.Services.AddHostedService<Worker>(); //builder.Services.AddSingleton<IMessageWriter, MessageWriter>(); builder.Services.AddSingleton<IMessageWriter, LoggingMessageWriter>(); using var host = builder.Build(); host.Run(); */ // 第二种DI容器构建方法! var host = Host .CreateDefaultBuilder(args) .ConfigureServices(services => { services.AddHostedService<Worker>(); services.AddSingleton<IMessageWriter, LoggingMessageWriter>(); }).Build(); host.Run(); } } /// <summary> /// 在依赖项注入术语中,服务:通常是向其他对象提供服务的对象,如 IMessageWriter 服务。 /// </summary> public interface IMessageWriter { public void Write( string message); } /// <summary> /// MessageWriter 是服务实现! /// </summary> public class MessageWriter : IMessageWriter { public void Write( string message) { Console.WriteLine($ "{message}" ); } } public class LoggingMessageWriter : IMessageWriter { private readonly ILogger<LoggingMessageWriter> _logger; public LoggingMessageWriter(ILogger<LoggingMessageWriter> logger) { _logger = logger; } public void Write( string message) { _logger.LogInformation($ "Info: {message}" ); } } public class Worker : BackgroundService { private readonly IMessageWriter _messageWriter; public Worker(IMessageWriter messageWriter) { _messageWriter = messageWriter; } protected override async Task ExecuteAsync(CancellationToken stoppingToken) { while (!stoppingToken.IsCancellationRequested) { _messageWriter.Write($ "Worker running at: {DateTimeOffset.Now}" ); await Task.Delay(2_000, stoppingToken); /* * info: ConsoleAppDI.LoggingMessageWriter[0] * Info: Worker running at: 2023/8/10 9:25:05 +08:00 */ } } } |
运行结果:
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