StructureMap和.Net Core

Question

我正在创建一个准系统.NET Core Web API项目（从下面的空白模板开始） https://andrewlock.net/removing-the-mvc-razor-dependencies-from-the-web-api-template-in-asp-网络核心/

直到我添加了StructureMap，下面的代码才能正常工作。 现在，我收到此错误。

StructureMap.StructureMapConfigurationException：没有注册默认实例，并且无法自动确定类型'System.IServiceProvider'的实例

没有为System.IServiceProvider指定配置

1.）Container.GetInstance（）

在WebApplication4.Startup.ConfigureServices（IServiceCollection服务）的StructureMap.Container.GetInstanceT处的StructureMap.SessionCache.GetDefault（Type pluginType，IPipelineGraphpipelineGraph）处-从上一个引发异常的位置开始的堆栈跟踪-在System.Runtime处Microsoft.AspNetCore.Hosting.ConventionBasedStartup.ConfigureServices（IServiceCollection服务）的.ExceptionServices.ExceptionDispatchInfo.Throw（）Microsoft.AspNetCore.Hosting.Internal.WebHost.BuildApplication（）的Microsoft.AspNetCore.Hosting.Internal.WebHost.EnsureApplicationServices（）的Microsoft.AspNetCore.Hosting。

有任何想法吗？

请注意：我们没有使用builder.AppMvc()因为我们正在尝试尽可能缩小此api。

这是相关的代码。

    public IServiceProvider ConfigureServices(IServiceCollection services)
    {
        var builder = services.AddMvcCore();
        builder.AddApiExplorer();

        builder.AddAuthorization();
        builder.AddFormatterMappings();
        builder.AddJsonFormatters();
        builder.AddCors();

        // Register the Swagger generator, defining one or more Swagger documents
        services.AddSwaggerGen(c =>
        {
            c.SwaggerDoc("v1", new Info { Title = "My API", Version = "v1" });
        });

        var container = ContainerConfigurator.Configure();

        return container.GetInstance<IServiceProvider>();
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
    {
        loggerFactory.AddConsole();

        if (env.IsDevelopment())
            app.UseDeveloperExceptionPage();

        app.UseMvc();

        // Enable middleware to serve generated Swagger as a JSON endpoint.
        app.UseSwagger();

        // Enable middleware to serve swagger-ui (HTML, JS, CSS etc.), specifying the Swagger JSON endpoint.
        app.UseSwaggerUI(c =>
        {
            c.SwaggerEndpoint("/swagger/v1/swagger.json", "My API V1");
        });
    }

public class ContainerConfigurator
{
    public static Container Configure()
    {
        var container = new Container(
            x => x.Scan
            (
                s =>
                {
                    s.TheCallingAssembly();
                    s.WithDefaultConventions();
                    s.AddAllTypesOf<IStartupTask>();
                    s.LookForRegistries();
                    s.AssembliesAndExecutablesFromApplicationBaseDirectory();

                }
            )
        );


        return container;
    }
}

Answer 1

您忘记了使用服务集合填充容器，这就是为什么容器不知道如何解析IServiceProvider 。

添加x.Populate(services); 行，其中services是您在ConfigureServices方法中拥有的IServiceCollection的实例。 这样的事情应该起作用：

 public static Container Configure(IServiceCollection services)
 {
    var container = new Container( config  => 
      {
          config.Scan(s =>
            {
                s.TheCallingAssembly();
                s.WithDefaultConventions();
                s.AddAllTypesOf<IStartupTask>();
                s.LookForRegistries();
                s.AssembliesAndExecutablesFromApplicationBaseDirectory();
            });
          config.Populate(services);  
       });

    return container;
}