实际在ASP.NET Core的ConfigureServices阶段读取AppSettings

本文介绍了实际在ASP.NET Core的ConfigureServices阶段读取AppSettings的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我需要在ASP.NET Core 1.0 Web应用程序的ConfigureServices方法中设置一些依赖项(服务).

I need to setup a few dependencies (services) in the ConfigureServices method in an ASP.NET Core 1.0 web application.

问题是，基于新的JSON配置，我需要设置服务或其他服务.

The issue is that based on the new JSON configuration I need to setup a service or another.

在应用生存期的ConfigureServices阶段，我似乎无法真正读取设置:

I can't seem to actually read the settings in the ConfigureServices phase of the app lifetime:

public void ConfigureServices(IServiceCollection services) { var section = Configuration.GetSection("MySettings"); // this does not actually hold the settings services.Configure<MySettingsClass>(section); // this is a setup instruction, I can't actually get a MySettingsClass instance with the settings // ... // set up services services.AddSingleton(typeof(ISomething), typeof(ConcreteSomething)); }

我实际上需要阅读该部分，并确定要为ISomething注册的内容(可能与ConcreteSomething不同).

I would need to actually read that section and decide what to register for ISomething (maybe a different type than ConcreteSomething).

推荐答案

这是从appSettings.json方法中直接从appSettings.json获取类型设置的方法:

That is the way you can get the typed settings from appSettings.json right in ConfigureServices method:

public class Startup { public Startup(IConfiguration configuration) { Configuration = configuration; } public IConfiguration Configuration { get; } public void ConfigureServices(IServiceCollection services) { services.Configure<MySettings>(Configuration.GetSection(nameof(MySettings))); services.AddSingleton(Configuration); // ... var settings = Configuration.GetSection(nameof(MySettings)).Get<MySettings>(); int maxNumberOfSomething = settings.MaxNumberOfSomething; // ... } // ... }