读取appsettings.json-字段保持为空

Question

我觉得这家初创公司有问题。cs，因为我的

所以我们有自己的应用程序设置。json

"Config": {
    "ApplicationName": "some name",
    "ConnectionString": "someconstring",
    "Version": "1.0.0"
  },

这是我们的模型

public class Config
    {   
        public string ApplicationName { get; set; }
        public string ConnectionString { get; set; }
        public string Version { get; set; }
    }

startup.cs

 public Startup(IConfiguration configuration)

    {
        Configuration = configuration;
    }



public static IConfiguration Configuration { get; set; }

    // This method gets called by the runtime. Use this method to add services to the container.
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddMvc();
        // Add functionality to inject IOptions<T>
        services.AddOptions();

        // Add our Config object so it can be injected
        services.Configure<Config>(Configuration);
    }

然后在我们的控制器中，我尝试加载这些数据，但不幸的是它们仍然是空的。

   private IOptions<Config> config;
            public CompaniesController(IOptions<Config> config)
            {
                this.config = config;
            }

我试图改变这家初创公司。cs和类似的东西

 services.Configure<Config>(options =>
            {
                options.ConnectionString = Configuration.GetSection("Config:ConnectionString").Value;
            });

但这似乎不起作用。

我一直在使用的资源：

https://dzone.com/articles/dynamic-connection-string-in-net-core

https://stackoverflow.com/questions/31453495/how-to-read-appsettings-values-from-json-file-in-asp-net-core

https://docs.microsoft.com/en-us/aspnet/core/fundamentals/configuration/options?view=aspnetcore-2.2

但很明显，我忽略了一个关键点。

编辑：我正在使用ASP。Net Core 2.0

编辑2：

Program.cs

public class Program
    {
        public static void Main(string[] args)
        {
            BuildWebHost(args).Run();
        }

        public static IWebHost BuildWebHost(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseStartup<Startup>()
                .Build();
    }

整个应用程序设置。json文件

{
  "Config": {
    "ApplicationName": "somename",
    "ConnectionString": "someconstring",
    "Version": "1.0.0"
  },
  "Logging": {
    "IncludeScopes": false,
    "Debug": {
      "LogLevel": {
        "Default": "Warning"
      }
    },
    "Console": {
      "LogLevel": {
        "Default": "Warning"
      }
    }
  }
}




Answer 1

     services.Configure<Config>(options =>
                {
                    options.ConnectionString = Configuration.GetValue<string>("Config:ConnectionString");
                    options.ApplicationName = "test";
                });

如果你想更广泛地配置你的选项。

Answer 2

services.Configure<Config>(Configuration);

这一行没有达到预期的结果，因为您要查找的JSON属性嵌套在appsettings中的Config属性下。json文件。要按预期加载这些值，请使用GetSection抓取Config部分并将其传递到Configure

services.Configure<Config>(Configuration.GetSection("Config"));