如何使用ConfigurationBinder在startup.cs的配置方法 [英] How to use ConfigurationBinder in Configure method of startup.cs

问题描述

的 asp.net mvc的6 beta5的的

我试图用config.json激活\\ disactive记录

I've tried to use config.json to activate\disactive logging

public IConfiguration Configuration { get; set; }

public Startup(IHostingEnvironment env, IApplicationEnvironment appEnv)
         {
            var configurationBuilder = new ConfigurationBuilder(appEnv.ApplicationBasePath)
            .AddJsonFile("config.json")
            .AddEnvironmentVariables();
            Configuration = configurationBuilder.Build();

            DBContext.ConnectionString = Configuration.Get("Data:DefaultConnection:ConnectionString");
        }

public void ConfigureServices(IServiceCollection services)
        {
            services.AddOptions();
            services.Configure<AppSettings>(Configuration.GetConfigurationSection("AppSettings"));
        }

// Configure is called after ConfigureServices is called.
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerfactory)
        {
            // that line cause NullReferenceException  
            AppSettings settings = ConfigurationBinder.Bind<AppSettings>(Configuration);  
             if (settings.Log.IsActive)
             {
              ................
        }

从<一个实例href=\"http://stackoverflow.com/questions/30263681/asp-net-5-vnext-getting-a-configuration-setting\">ASP.NET 5（vNext） - 获取一个配置设置和的http://perezgb.com/2015/07/04/aspnet-5-typed-settings-with-the-configurationbinder/

是否有另一种方式来获得的AppSettings的实例在配置的方法？我需要的类型的对象。

Example from ASP.NET 5 (vNext) - Getting a Configuration Setting and http://perezgb.com/2015/07/04/aspnet-5-typed-settings-with-the-configurationbinder/
Is there another way to get an instance of the AppSettings in the "configure" method? I need typed object.

推荐答案

在 ConfigureServices 配置的每个服务可以在配置被注入运行时的方法：

Every service configured in ConfigureServices can be injected in the Configure method by the runtime:

public void Configure(IApplicationBuilder app, IOptions<AppSettings> options)
{
    // access options.Options here
}

这是比访问有点清洁的解决方案的的ServiceProvider 直接

This is a bit cleaner solution than accessing the ServiceProvider directly.

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