Question

以下内容将抛出端点已被使用的异常：

public class Startup
{
    // This method gets called by the runtime. Use this method to add services to the container.
    // For more information on how to configure your application, visit http://go.microsoft.com/fwlink/?LinkID=398940
    public void ConfigureServices(IServiceCollection services)
    {
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app)
    {
        app.Run(async (context) =>
        {
            await context.Response.WriteAsync("Hello World 1");
        });
    }
}

public class Startup1
{
    // This method gets called by the runtime. Use this method to add services to the container.
    // For more information on how to configure your application, visit http://go.microsoft.com/fwlink/?LinkID=398940
    public void ConfigureServices(IServiceCollection services)
    {
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app)
    {
        app.Run(async (context) =>
        {
            await context.Response.WriteAsync("Hello World!");
        });
    }
}
public class Program
{
    public static void Main(string[] args)
    {

        string serverUrl = $"http://localhost:4000/test1/";

        var _webHost = new WebHostBuilder().UseKestrel()
                                        .UseContentRoot(Directory.GetCurrentDirectory())
                                        .UseStartup<Startup>()
                                        .UseUrls(serverUrl)
                                         .UseIISIntegration()
                                        .Build();

        _webHost.Start();

        string serverUrl1 = $"http://localhost:4000/test2/";
        var _webHost1 = new WebHostBuilder().UseKestrel()
                                       .UseContentRoot(Directory.GetCurrentDirectory())
                                       .UseStartup<Startup1>()
                                       .UseIISIntegration()
                                       .UseUrls(serverUrl1)
                                       .Build();

        _webHost1.Start();

        Console.ReadLine();
    }
}

未处理的异常：System.AggregateException：发生了一个或多个错误。（错误-4091 EADDRINUSE地址已在使用中）---＆gt; Microsoft.AspNetCore.Server.Kestrel.Networking.UvException：错误-4091 EADDRINUSE地址已在使用中在Microsoft.AspNetCore.Server.Kestrel.Networking.Libuv.Check（Int32 statusCode）在Microsoft.AspNetCore.Server.Kestrel.Networking.UvStreamHandle.Listen（Int32 backlog，Action 4 callback, Object state) at Microsoft.AspNetCore.Server.Kestrel.Http.TcpListenerPrimary.CreateListenSocket() at Microsoft.AspNetCore.Server.Kestrel.Http.Listener.<>c.<StartAsync>b__6_0(Object state) --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.AspNetCore.Server.Kestrel.Http.ListenerPrimary.<StartAsync>d__9.MoveNext() --- End of inner exception stack trace --- at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions) at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken) at Microsoft.AspNetCore.Server.Kestrel.KestrelEngine.CreateServer(ServerAddress address) at Microsoft.AspNetCore.Server.Kestrel.KestrelServer.Start[TContext](IHttpApplication 1个应用程序）在Microsoft.AspNetCore.Hosting.Internal.WebHost.Start（）在ConsoleApp1.Program.Main（String [] args）按任意键继续。。

有没有办法使用不同的虚拟路径在同一个端口上拥有两个listerner，就像我们使用owin和httplistener一样？

Answer 1

不，Kestrel不支持这一点。 WebListener和IIS确实可以。

Answer 2

我知道这在使用主机和不同的应用程序时曾经使用过dnx，因此它仍然可以正常工作。另一种方法是在.UseWhen(context => ... )方法中使用Startup.Configure，如blog post中所述。

public void Configure(IAppBuilder app)
{
    app.UseWhen(context => context.Request.Path.ToString().StartsWith("/test1"), testApp1 =>
    {
        app.UseMvc();
    });

    app.UseWhen(context => context.Request.Path.ToString().StartsWith("/test2"), testApp1 =>
    {
        app.UseMvc();
    });
}


public static class AppExtensions {
    public static IApplicationBuilder UseWhen(this IApplicationBuilder app
        , Func<Microsoft.AspNetCore.Http.HttpContext, bool> condition
        , Action<IApplicationBuilder> configuration)
    {
        if (app == null)
        {
            throw new ArgumentNullException(nameof(app));
        }

        if (condition == null)
        {
            throw new ArgumentNullException(nameof(condition));
        }

        if (configuration == null)
        {
            throw new ArgumentNullException(nameof(configuration));
        }

        var builder = app.New();
        configuration(builder);

        return app.Use(next => {
            builder.Run(next);

            var branch = builder.Build();

            return context => {
                if (condition(context))
                {
                    return branch(context);
                }

                return next(context);
            };
        });
    }
}

使用红隼

2 个答案: