从appsettings获取值。.net core中的Json

不确定我在这里错过了什么，但我无法从我的应用程序设置中获得值。Json在我的。net核心应用程序。我有我的appsettings。json:

{
    "AppSettings": {
        "Version": "One"
    }
}

启动:

public class Startup
{
    private IConfigurationRoot _configuration;
    public Startup(IHostingEnvironment env)
    {
        _configuration = new ConfigurationBuilder()
    }
    public void ConfigureServices(IServiceCollection services)
    {
      //Here I setup to read appsettings        
      services.Configure<AppSettings>(_configuration.GetSection("AppSettings"));
    }
}

模型:

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

控制器:

public class HomeController : Controller
{
    private readonly AppSettings _mySettings;

    public HomeController(IOptions<AppSettings> settings)
    {
        //This is always null
        _mySettings = settings.Value;
    }
}

_mySettings总是空的。我是不是遗漏了什么?

当前回答

ASP。NET Core 3.1你可以遵循以下指南:

https://learn.microsoft.com/en-us/aspnet/core/fundamentals/configuration/?view=aspnetcore-3.1

当您创建一个新的ASP。在Program.cs中，你会有如下的配置行:

Host.CreateDefaultBuilder(args)

这将启用以下功能:

ChainedConfigurationProvider : Adds an existing IConfiguration as a source. In the default configuration case, adds the host configuration and setting it as the first source for the app configuration. appsettings.json using the JSON configuration provider. appsettings.Environment.json using the JSON configuration provider. For example, appsettings.Production.json and appsettings.Development.json. App secrets when the app runs in the Development environment. Environment variables using the Environment Variables configuration provider. Command-line arguments using the Command-line configuration provider.

这意味着您可以注入IConfiguration并使用字符串键获取值，甚至是嵌套值。像IConfiguration“父母:孩子”;

例子:

appsettings.json

{
  "ApplicationInsights":
    {
        "Instrumentationkey":"putrealikeyhere"
    }
}

WeatherForecast.cs

[ApiController]
[Route("[controller]")]
public class WeatherForecastController : ControllerBase
{
    private static readonly string[] Summaries = new[]
    {
        "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
    };

    private readonly ILogger<WeatherForecastController> _logger;
    private readonly IConfiguration _configuration;

    public WeatherForecastController(ILogger<WeatherForecastController> logger, IConfiguration configuration)
    {
        _logger = logger;
        _configuration = configuration;
    }

    [HttpGet]
    public IEnumerable<WeatherForecast> Get()
    {
        var key = _configuration["ApplicationInsights:InstrumentationKey"];

        var rng = new Random();
        return Enumerable.Range(1, 5).Select(index => new WeatherForecast
        {
            Date = DateTime.Now.AddDays(index),
            TemperatureC = rng.Next(-20, 55),
            Summary = Summaries[rng.Next(Summaries.Length)]
        })
        .ToArray();
    }
}

2020-04-22 09:28:30

其他回答

就我而言，我从头开始创建所有内容和应用程序设置。Json也没有加载。经过一些调试后，我发现文件从未复制到“目标文件夹”。

为了解决这个问题，我只需要设置正确的文件属性。

它是这样的:

2021-09-28 13:08:49

. net core 3。X

不需要创建新的模型并在Startup.cs中设置。

控制器添加新包-使用Microsoft.Extensions.Configuration;

public class HomeController : Controller
{
    private readonly IConfiguration _mySettings;

    public HomeController (IConfiguration mySettings)
    {
         _mySettings= mySettings;
    }
 
    //ex: you can get value on below function 
    public IEnumerable<string> Get()
    {
        var result = _config.GetValue<string>("AppSettings:Version"); // "One"
        return new string[] { result.ToString() };
    }
}

2020-10-21 07:04:03

我认为最好的选择是:

创建一个模型类作为配置模式在DI注册: services.Configure (Configuration.GetSection(“democonfig”)); 从控制器中的DI中获取模型对象的值: private readonly myConfig; (IOptions<your_model> configOps) ｛这一点。myConfig = configOps.Value; ｝

2020-04-20 06:02:53

像这样在这里添加所需的键。在这种情况下，它的securecookie:

在startup.cs中添加构造函数公共启动(IConfiguration配置) ｛配置=配置; ｝ public IConfiguration Configuration {get;｝使用Configuration[" secucookie "]访问设置

2021-01-08 06:30:57

亚比谢克的回答是:

如果你想将值导入到静态类中，那么只需使用(ReSharper推荐):

static IConfiguration conf = (JsonConfigurationExtensions.AddJsonFile(new ConfigurationBuilder().SetBasePath(Directory.GetCurrentDirectory()), "appsettings.json").Build());

private static string AuthorizationServiceURL { get; } = conf["ServiceUrls:AuthorizationUrl"];

// appsettings.json
{
  "ServiceUrls": {
    "AuthorizationUrl": "https://example.com/authorize"
  } 
}

2022-01-05 08:34:15

从appsettings获取值。.net core中的Json

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