如何将ConfigurationRoot添加到UWP程序中的依赖注入中？

Question

在我的UWP应用程序中，我能够使用Microsoft.Extensions.Configuration包从JSON格式的appSettings文件中读取数据。

    IConfiguration configuration = new ConfigurationBuilder()
        .AddJsonFile("appsettings.json", true, true)
        .AddJsonFile($"appsettings.{App.UWPENVIRONMENT}.json", true, true)
        .Build();
    string clientId = configuration["security:clientId"];
    string authority = configuration["security:authority"];

我现在似乎不能做的是使用System.Composition依赖项注入将配置提供给我的UWP应用程序的其余部分。由于配置对象的构建方式(使用Build方法)，我无法理解如何将此配置嵌入到某种构造函数中。

想到的一个选择是，我可以将接口与对象关联起来，如下所示：

        conventions.ForObject(configuration)
            .Shared()
            .Export(ecb => ecb.AsContractType<IConfiguration>());

但是DI包似乎不支持这种想法。我该如何解决这个问题：

1. 找到一种方法来构建一个类型。
2. 将接口与具体实例关联起来。
3. 其他

Answer 1

下面是创建类型化ConfigurationRoot的代码：

    /// <summary>
    /// The configuration for this application.
    /// </summary>
    public class ApplicationConfiguration : ConfigurationRoot
    {
        /// <summary>
        /// The client id of the service application to which we want to connect.
        /// </summary>
#if PRODUCTION
        private const string UWPENVIRONMENT = "Production";
#elif STAGING
        private const string UWPENVIRONMENT = "Staging";
#else
        private const string UWPENVIRONMENT = "Development";
#endif

        /// <summary>
        /// Initializes a new instance of the <see cref="ApplicationConfiguration"/> class.
        /// </summary>
        public ApplicationConfiguration()
            : base(ApplicationConfiguration.GetProviders())
        {
        }

        /// <summary>
        /// Gets the configuration providers.
        /// </summary>
        /// <returns>A list of the configuration providers.</returns>
        private static List<IConfigurationProvider> GetProviders()
        {
            // Build a configuration that reads from the appsettings.json files and extract the providers.
            IConfigurationRoot configurationRoot = new ConfigurationBuilder()
                .AddJsonFile("appsettings.json", true, true)
                .AddJsonFile($"appsettings.{ApplicationConfiguration.UWPENVIRONMENT}.json", true, true)
                .Build();
            return configurationRoot.Providers.ToList();
        }
    }

并将其添加到DI中：

    conventions.ForType<ApplicationConfiguration>().Shared().Export(ecb => ecb.AsContractType<IConfiguration>());

您的客户端现在将使用与.NET核心web服务大致相同的配置文件。