Question

这是我的appsettings.json

{
"MySettings": {
    "DefaultSetting": "Key1",
    "Settings": {
      "Key1": {
        "Full": "Description1",
        "Short": "Desc1"
      },
      "Key2": {
        "Full": "Description2",
        "Short": "Desc2"
      },
      "Key3": {
        "Full": "Description3",
        "Short": "Desc3"
      }
    }
  }
}

我的班级定义：

    public class MySettings
    {
        public Dictionary<string, Setting> Settings { get; set; }

        public string DefaultSetting { get; set; }
    }

    public class Setting
    {
        public string Full { get; set; }

        public string Short { get; set; }
    }

My Startup.cs：

        public void ConfigureServices(IServiceCollection services)
        {
            // Add framework services.
            services.AddApplicationInsightsTelemetry(Configuration);
            services.Configure<MySettings>(Configuration.GetSection("MySettings"));
            services.AddMvc();
        }

在HomeController中：

    public class HomeController : Controller
    {
        private readonly MySettings _mySettings;
        public HomeController(IOptionsSnapshot<MySettings> mySettings)
        {
            this._mySettings= mySettings.Value;
        }

        public IActionResult Index()
        {
            return Json(_mySettings.DefaultSetting);
        }
    }

我希望在保存更改的appsettings.json文件并刷新浏览器时获取新的设置值。

我之前尝试过IOptionsMonitor

参考：http://andrewlock.net/reloading-strongly-typed-options-when-appsettings-change-in-asp-net-core-rc2/

但是我有很多强类型的类，它会注册太多的IOptionsMonitor

是否有更简单的方法来实现自动重新加载强类型类？

Answer 1

是的，您可以在更改时重新加载appsettings。为此，在启动构造函数中，将 reloadOnChange 指定为true，如下所示 -

    var builder = new ConfigurationBuilder()
        .SetBasePath(env.ContentRootPath)
        .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
        .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true, reloadOnChange: true)
        .AddEnvironmentVariables();

使用强类型重新加载appsettings.json

1 个答案: