ASP.NET 5 (vNext) - 配置

我正在尝试学习 ASP.NET 5。我在 Mac OS X 上使用它。此时，我有一个如下所示的 config.json 文件：

配置.json

{
    "AppSettings": {
        "Environment":"dev"
    },

    "DbSettings": {
        "AppConnectionString": "..."
    },

    "EmailSettings": {
        "EmailApiKey": "..."        
    },  
}

我试图弄清楚如何将这些设置加载到 Startup.cs 中的配置文件中。目前，我有一个如下所示的文件：

配置.cs

public class AppConfiguration
{
    public AppSettings AppSettings { get; set; }

    public DbSettings DbSettings { get; set; }

    public EmailSettings EmailSettings { get; set; }        
}

public class AppSettings
{
    public string Environment { get; set; }
}

public class DbSettings
{
    public string AppConnectionString { get; set; }
}

public class EmailSettings
{
    public string MandrillApiKey { get; set; }
}

然后，在 Startup.cs 中，我有以下内容：

public IConfiguration Configuration { get; set; }
public Startup(IHostingEnvironment environment)
{
  var configuration = new Configuration().AddJsonFile("config.json");
  Configuration = configuration;
}

public void ConfigureServices(IServiceCollection services)
{
  services.Configure<AppConfiguration>(Configuration);
} 

然而，这种方法行不通。基本上，它就像不知道如何在 .json 和 Config 类之间映射。我该怎么做呢？

我真的很想继续使用 DI 方法，这样我就可以更有效地测试我的应用程序。

谢谢

In your Startup类，首先指定您的配置源：

private readonly IConfiguration configuration;

public Startup(IHostingEnvironment env)
{
    configuration = new Configuration()
        .AddJsonFile("config.json")
        .AddJsonFile($"config.{env.EnvironmentName}.json", optional: true);
}

The env.EnvironmentName是这样的"development" or "production"。假设是"development"。该框架将尝试从中提取配置值config.development.json第一的。如果请求的值不存在，或者config.development.json文件不存在，那么框架将尝试从中提取值config.json.

配置您的config.json部分作为服务，如下所示：

public void ConfigureServices(IServiceCollection services)
{
    services.Configure<AppSettings>(configuration.GetSubKey("AppSettings"));
    services.Configure<DbSettings>(configuration.GetSubKey("DbSettings"));
    services.Configure<EmailSettings>(configuration.GetSubKey("EmailSettings"));
}

Calling Configure<T>(IConfiguration) on the IServiceCollection注册类型IOptions<T>在依赖注入容器中。请注意，您不需要AppConfiguration class.

然后指定要注入的依赖项，如下所示：

public class EmailController : Controller
{
    private readonly IOptions<EmailSettings> emailSettings;

    public EmailController (IOptions<EmailSettings> emailSettings)
    {
        this.emailSettings = emailSettings;
    }

    public IActionResult Index()
    {
        string apiKey = emailSettings.Options.EmailApiKey;
        ...
    }
}