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.net 通用主机状态的 .net文档

主机是封装应用程序资源和生命周期功能的对象

然而，它并没有说支持在单个进程中运行多个主机（即应用程序）。下面的代码运行得很好，并很好地终止了所有正在运行Host的 s 和服务Ctrl-C。但这只是一个非常简单的演示......

问题是：通用主机（或控制台主机或后台工作人员）是否存在排除“单个进程中的多个主机”选项的限制？

        private static async Task Main()
        {
            await RunMultipleHosts();

            async Task RunMultipleHosts()
            {
                var hostTasks = new[]
                {
                    RunHostFor("service in host 1"),
                    RunHostFor("service in host 2"),
                    RunHostFor("service in host 3")
                };

                await Task.WhenAll(hostTasks);
            }

            static Task RunHostFor(string serviceName)
            {
                return Host
                    .CreateDefaultBuilder()
                    .ConfigureServices(services =>
                    {
                        services
                            .AddSingleton(new TestService.Name(serviceName))
                            .AddHostedService<TestService>();
                    })
                    .RunConsoleAsync();
            }
        }

使用以下简单的演示服务（为了完整起见，复制到这里）

        internal class TestService : IHostedService
        {
            private readonly ILogger<TestService> logger;
            private readonly string name;
            private readonly Random random = new();

            public TestService(Name serviceName, ILogger<TestService> logger)
            {
                this.logger = logger;
                name = serviceName.Value;
            }

            Task IHostedService.StartAsync(CancellationToken cancellationToken)
            {
                logger.LogWarning($"Started {name}.");
                return Task.CompletedTask;
            }

            async Task IHostedService.StopAsync(CancellationToken cancellationToken)
            {
                var aFewSeconds = random.Next(2000, 5000);

                await Task.Delay(aFewSeconds, cancellationToken);

                logger.LogWarning($"Stopped {name}.");
            }

            internal record Name(string Value);
        }
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