c# - *.json 文件更改后 IOptionsSnapshot 不刷新

我遵循了 hello world 示例表单 IOptionsSnapshot ，但是在文件 config.json 更改并保存后内容不会刷新。

我的开发环境:

1.VS 2017

2 .csproj 文件如下

  <PropertyGroup>
        <TargetFramework>netcoreapp1.1</TargetFramework>
        <PreserveCompilationContext>true</PreserveCompilationContext>
        <AssemblyName>UsingOptions</AssemblyName>
        <OutputType>Exe</OutputType>
        <PackageId>UsingOptions</PackageId>
        <RuntimeFrameworkVersion>1.0.4</RuntimeFrameworkVersion>
        <PackageTargetFallback>$(PackageTargetFallback);dotnet5.6;portable-net45+win8</PackageTargetFallback>
      </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore" Version="1.1.1" />
    <PackageReference Include="Microsoft.AspNetCore.Mvc" Version="1.1.1" />
    <PackageReference Include="Microsoft.AspNetCore.Server.IISIntegration" Version="1.1.1" />
    <PackageReference Include="Microsoft.AspNetCore.Server.Kestrel" Version="1.1.1" />
    <PackageReference Include="Microsoft.Extensions.Configuration" Version="1.1.1" />
    <PackageReference Include="Microsoft.Extensions.Configuration.FileExtensions" Version="1.1.1" />
    <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="1.1.1" />
    <PackageReference Include="Microsoft.Extensions.Options" Version="1.1.1" />
    <PackageReference Include="Microsoft.Extensions.Options.ConfigurationExtensions" Version="1.1.1" />
    <PackageReference Include="Microsoft.AspNetCore.Diagnostics" Version="1.1.1" />
    <PackageReference Include="Microsoft.Extensions.Logging" Version="1.1.1" />
    <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="1.1.1" />
  </ItemGroup>

下面是来自 IOptionsSnapshot 的代码

config.json:
{
  "Time": {
    "Message": "Hello "
  }
}


public class TimeOptions
{
    // Records the time when the options are created.
    public DateTime CreationTime { get; set; } = DateTime.Now;

    // Bound to config. Changes to the value of "Message"
    // in config.json will be reflected in this property.
    public string Message { get; set; }
}

public class Controller
{
    public readonly TimeOptions _options;

    public Controller(IOptionsSnapshot<TimeOptions> options)
    {
        _options = options.Value;
    }

    public Task DisplayTimeAsync(HttpContext context)
    {
        return context.Response.WriteAsync(_options.Message + _options.CreationTime);
    }
}

public class Startup
{
    public Startup(IHostingEnvironment env)
    {
        var builder = new ConfigurationBuilder()
            .SetBasePath(Directory.GetCurrentDirectory())
            // reloadOnChange: true is required for config changes to be detected.
            .AddJsonFile("config.json", optional: false, reloadOnChange: true)
            .AddEnvironmentVariables();
        Configuration = builder.Build();
    }

    public IConfigurationRoot Configuration { get; set; }

    public void Configure(IApplicationBuilder app)
    {
        // Simple mockup of a simple per request controller that writes
        // the creation time and message of TimeOptions.
        app.Run(DisplayTimeAsync);
    }

    public void ConfigureServices(IServiceCollection services)
    {
        // Simple mockup of a simple per request controller.
        services.AddScoped<Controller>();

        // Binds config.json to the options and setups the change tracking.
        services.Configure<TimeOptions>(Configuration.GetSection("Time"));
    }

    public Task DisplayTimeAsync(HttpContext context)
    {
        context.Response.ContentType = "text/plain";
        return context.RequestServices.GetRequiredService<Controller>().DisplayTimeAsync(context);
    }

    public static void Main(string[] args)
    {
        var host = new WebHostBuilder()
            .UseKestrel()
            .UseIISIntegration()
            .UseStartup<Startup>()
            .Build();
        host.Run();
    }
}

最佳答案

IOptions 和 IOptionsSnapshot 的源代码看起来相同。这些接口(interface)在 OptionsManager 中有共同的实现。所以 OptionsSnapshot 不会重新加载选项。使用 IOptionsMonitor 代替 IOptionsSnapshot。您不需要订阅 OnChange 事件，只需访问 CurrentValue 属性即可。

UPD
自 Microsoft.Extensions.Options 2.x 发布以来，IOptionsSnapshot 已被删除。

关于c# - *.json 文件更改后 IOptionsSnapshot 不刷新，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/42751867/