在我的ASP.NET Core应用程序中，我将appsettings.json绑定到强类型的AppSettings类。

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

    Configuration = builder.Build();
}

public void ConfigureServices(IServiceCollection services)
{
    services.Configure<AppSettings>(Configuration);
    //...
}

在单例类中，我将这个AppSettings类包装如下：

public class AppSettingsWrapper : IAppSettingsWrapper
{
    private readonly IOptions<AppSettings> _options;

    public AppSettingsAdapter(IOptions<AppSettings> options)
    {
        _options = options ?? throw new ArgumentNullException("Options cannot be null");
    }

    public SomeObject SomeConvenienceGetter()
    {
        //...
    }
}

现在，如果json文件发生更改，我正在努力重新加载AppSettings。我在某处读到IOptionsMonitor类可以检测到更改，但是在我的情况下它不起作用。

为了测试目的，我尝试像这样调用OnChange事件：

public void Configure(IApplicationBuilder applicationBuilder, IOptionsMonitor<AppSettings> optionsMonitor)
{
    applicationBuilder.UseStaticFiles();
    applicationBuilder.UseMvc();

    optionsMonitor.OnChange<AppSettings>(vals => 
    {
        System.Diagnostics.Debug.WriteLine(vals);
    });
}

当我更改json文件时，永远不会触发该事件。有人知道我可以进行哪些更改以使重装机制在我的方案中工作吗？