Question

像这样在我的应用程序中的Program.cs中注册配置

public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                   .ConfigureAppConfiguration((hostingContext, config) =>
                   {
                       config.AddJsonFile("appsettings.secret.json", optional: true, reloadOnChange: true);
                   })
                   .UseStartup<Startup>()
                   .ConfigureLogging(logging =>
                   {override configuration in NLog.config

                       logging.ClearProviders();
                       logging.SetMinimumLevel(LogLevel.Trace);
                   })
                   .UseNLog(); // NLog: setup NLog for Dependency injection;

我有一个需要IConfigurationRoot实例的类

public class ConfiguredKeyDataProtectionProvider : IDataProtectionProvider
{
    // Example configuration required for use of this class

    // {
    //     "ConfiguredKeyDataProtectionProvider": {
    //         "Key": {
    //             "TestPurpose": "asda2516shah"
    //         }
    //     }
    // }

    private readonly IConfigurationRoot _configurationRoot;

    public ConfiguredKeyDataProtectionProvider(IConfigurationRoot configurationRoot)
    {
        _configurationRoot = configurationRoot;
    }

    public IDataProtector CreateProtector(string purpose)
    {
        string encryptionKey = _configurationRoot.GetValue<string>("ConfiguredKeyDataProtectionProvider:Key:" + purpose);

        return new ConfiguredKeyDataProtector(encryptionKey);
    }
}

我正在尝试通过DI注册IConfiguredKeyDataProtectionProvider的实例。我期望已经注册了IConfiguration根实例（请注意，在StartUp.cs中重复读取配置文件-不确定是否需要这样做），IConfiguredKeyDataProtectionProvider将能够看到配置数据，但是似乎没有情况。

public class Startup
{
    public Startup(IHostingEnvironment env)
    {
        var configurationRoot = new ConfigurationBuilder()
            .AddJsonFile("appsettings.json")
            .AddJsonFile("appsettings.secret.json", optional: true, reloadOnChange: true)
            .Build();

        Configuration = configurationRoot;
    }

    public IConfigurationRoot Configuration { get; set; }

    // This method gets called by the runtime. Use this method to add services to the container.
    // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddSingleton<IConfigurationRoot>(Configuration);

        //...

        services.AddTransient<IDataProtectionProvider, ConfiguredKeyDataProtectionProvider>();

我应该如何正确配置我的应用程序，以便可以通过依赖注入来注册构造函数上具有IConfigurationRoot的类？

Answer 1

不确定为什么需要IConfigurationRoot接口，但是由于在构造主机之前已经建立了IConfigurationRoot的实例，因此您可以通过{{ 1}} ：

此外，无需两次构建配置，只需调用 .ConfigureServices(services =>{services.AddSingleton<IConfigurationRoot>(configRoot);}) 。

UseConfiguration(congfigRoot)

需要IConfigurationRoot的ASP.NET Core 2.x注册服务-无法访问配置数据

1 个答案: