.NET Core 2.0 BasePath 错误答案

【问题标题】：.NET Core 2.0 BasePath Error.NET Core 2.0 BasePath 错误
【发布时间】：2017-09-25 13:32:47
【问题描述】：

刚刚启动了一个新的 .NET Core 2.0 应用，但突然出现奇怪的行为，似乎找不到任何东西。

点击我的BuildWebHost().的.Run()时弹出如下错误：

System.InvalidOperationException: A path base can only be configured using IApplicationBuilder.UsePathBase().
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.<BindAddressAsync>d__7.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.AddressesStrategy.<BindAsync>d__2.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.<BindAsync>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Server.Kestrel.Core.KestrelServer.<StartAsync>d__21`1.MoveNext()
'dotnet.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.0.0\System.Diagnostics.Tools.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
Application Insights Telemetry (unconfigured): {"name":"Microsoft.ApplicationInsights.Dev.Exception","time":"2017-09-25T13:26:29.6923656Z","tags":{"ai.application.ver":"1.0.0.0","ai.internal.sdkVersion":"aspnet5c:2.1.1"},"data":{"baseType":"ExceptionData","baseData":{"ver":2,"properties":{"{OriginalFormat}":"Unable to start Kestrel.","CategoryName":"Microsoft.AspNetCore.Server.Kestrel","Exception":"System.InvalidOperationException: A path base can only be configured using IApplicationBuilder.UsePathBase().\r\n   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.<BindAddressAsync>d__7.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.AddressesStrategy.<BindAsync>d__2.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.<BindAsync>d__0.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at Microsoft.AspNetCore.Server.Kestrel.Core.KestrelServer.<StartAsync>d__21`1.MoveNext()","AspNetCoreEnvironment":"Development","DeveloperMode":"true"},"exceptions":[{"id":47609378,"typeName":"System.InvalidOperationException","message":"Unable to start Kestrel.","hasFullStack":true,"parsedStack":[{"level":0,"method":"Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder+<BindAddressAsync>d__7.MoveNext","assembly":"Microsoft.AspNetCore.Server.Kestrel.Core, Version=2.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60"},{"level":1,"method":"System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw","assembly":"System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e"},{"level":2,"method":"System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification","assembly":"System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e"},{"level":3,"method":"Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder+AddressesStrategy+<BindAsync>d__2.MoveNext","assembly":"Microsoft.AspNetCore.Server.Kestrel.Core, Version=2.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60"},{"level":4,"method":"System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw","assembly":"System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e"},{"level":5,"method":"System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification","assembly":"System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e"},{"level":6,"method":"Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder+<BindAsync>d__0.MoveNext","assembly":"Microsoft.AspNetCore.Server.Kestrel.Core, Version=2.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60"},{"level":7,"method":"System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw","assembly":"System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e"},{"level":8,"method":"System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification","assembly":"System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e"},{"level":9,"method":"Microsoft.AspNetCore.Server.Kestrel.Core.KestrelServer+<StartAsync>d__21`1.MoveNext","assembly":"Microsoft.AspNetCore.Server.Kestrel.Core, Version=2.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60"}]}],"severityLevel":"Critical"}}}
The thread 0x1d7c has exited with code 0 (0x0).
The thread 0x25c0 has exited with code 0 (0x0).
Exception thrown: 'System.InvalidOperationException' in System.Private.CoreLib.dll
An unhandled exception of type 'System.InvalidOperationException' occurred in System.Private.CoreLib.dll
A path base can only be configured using IApplicationBuilder.UsePathBase().

这是我的 Program.cs

public class Program
{
    public static void Main(string[] args)
    {
        BuildWebHost(args).Run();
    }

    public static IWebHost BuildWebHost(string[] args) =>
        WebHost.CreateDefaultBuilder(args)
            .UseStartup<Startup>()
            .Build();
}

这是我的 Startup.cs

public class Startup
{
    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public IConfiguration Configuration { get; set; }

    public void ConfigureServices(IServiceCollection services)
    {
        services.AddMvc();

        //Swagger
        services.AddSwaggerGen(c =>
        {
            c.SwaggerDoc("v1", new Info
            {
                Title = "2Commit Blogpost API",
                Version = "v1"
            });
        });

        //Mediatr
        services.AddScoped<IMediator, Mediator>();
        services.AddTransient<SingleInstanceFactory>(sp => sp.GetService);
        services.AddTransient<MultiInstanceFactory>(sp => sp.GetServices);
        services.AddMediatorHandlers(typeof(Startup).Assembly);

        //MongoDB
        services.Configure<MongoSettings>(s =>
        {
            s.Database = Configuration.GetSection("MongoConnection:Database").Value;
        });
        services.AddSingleton<IMongoClient, MongoClient>(client => new MongoClient(Configuration.GetSection("MongoConnection:ConnectionString").Value));

        //BL
        services.AddTransient<IUserService, UserService>();

        //DAL
        services.AddTransient<IRepository, MongoRepository>();
    }

    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        //Swagger
        app.UseSwagger();
        app.UseSwaggerUI(c =>
        {
            c.SwaggerEndpoint("/swagger/v1/swagger.json", "BlogPost API");
        });

        app.UseMvc();
    }
}

我似乎无法理解这个！

更新 1：

该错误仅在从命令行运行我的项目时弹出，当通过 IIS Express 运行它时，没有错误。

这是我的启动设置

{
  "iisSettings": {
    "windowsAuthentication": false,
    "anonymousAuthentication": true,
    "iisExpress": {
      "applicationUrl": "http://localhost:51592/swagger",
      "sslPort": 0
    }
  },
  "profiles": {
    "IIS Express": {
      "commandName": "IISExpress",
      "launchBrowser": true,
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    },
    "API": {
      "commandName": "Project",
      "launchBrowser": true,
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      },
      "applicationUrl": "http://localhost:5000/swagger"
    }
  }
}

【问题讨论】：

虽然不相关。您应该在 BL 中有一个等效的配置服务，并将对 DAL 的引用转移到那里。使用您当前的设置，您可以从上层直接访问 DAL，这打开了否定 BL 层的潜力。理想情况下，顶层不应该对 DAL 有任何了解。
这实际上困扰了我一段时间，但没有花时间考虑它。你有一个具体的例子说明我应该如何将我的 BL DAL 东西转换成 m BL？
我有，我会试着把它挖出来......我现在所在的网站上没有它。但我会在更新这个问题时向你展示我是如何做到的。
你有邮箱吗？我在这个网站上找不到任何地方可以发送私人邮件。我按照承诺为您准备了一些代码示例，向您展示了如何将对 DAL 的引用推入堆栈。
我已经弄明白了，谢谢！

标签： c# asp.net-core .net-core

【解决方案1】：

好的，在 1.X 中，您可以在从命令行运行时在您的 launchOptions 中添加一个基本路径到您的 applicationUrl，现在它只在使用 IIS 时有效。

在我的启动设置中，将我的 CLI 配置文件从使用中更改

"applicationUrl": "http://localhost:5000/swagger"

到

"applicationUrl": "http://localhost:5000"

成功了。

【讨论】：

您也可以继续从localhost:5000/swagger 访问它，方法是进行上述更改，然后将以下内容添加到 Startup.cs 的配置部分：app.UsePathBase("/swagger").UseMvc( );

【解决方案2】：

正如@TanguyB 所说，您应该更改 applicationUrl 但是你可以设置

"launchUrl": "http://localhost:5000/swagger"

在 Swagger 页面上运行您的应用程序

【讨论】：

【解决方案3】：

我正在使用Core 3.0：我删除了https url，只保留了http url

【讨论】：

那很好，但是标题是关于Core 2.0的，所以这是一个值得怀疑的答案