从控制器获取JsonOptions

IOptions<MvcJsonOptions> 进入你的控制器,就像这样:

private readonly MvcJsonOptions _jsonOptions;

public HomeController(IOptions<MvcJsonOptions> jsonOptions, /* ... */)
{
    _jsonOptions = jsonOptions.Value;
}

// ...

public bool GetIsIdented() =>
    _jsonOptions.SerializerSettings.Formatting == Formatting.Indented;

docs 有关的详细信息 IOptions (选项模式)。

如果你只关心 Formatting ,您可以稍微简化,只需使用 bool 场,就像这样:

private readonly bool _isIndented;

public HomeController(IOptions<MvcJsonOptions> jsonOptions, /* ... */)
{
    _isIndented = jsonOptions.Value.SerializerSettings.Formatting == Formatting.Indented;
}

在本例中,不需要 GetIsIndented

一种方法是创建一个类,在其中声明当前配置值

public class MvcConfig
{
    public Newtonsoft.Json.Formatting Formatting { get; set; }
}

public void ConfigureServices(IServiceCollection services)
{
    var mvcConfig = new MvcConfig
    {
        Formatting = Newtonsoft.Json.Formatting.Indented
    };

    services.AddMvc()
            .AddWebApiConventions()
            .AddJsonOptions(options=> options.SerializerSettings.Formatting=mvcConfig.Formatting);

    services.AddSingleton(mvcConfig);
}

然后注入控制器并使用它

public class HomeController : Controller
{
    private readonly MvcConfig _mvcConfig;
    public HomeController(MvcConfig mvcConfig)
    {
        _mvcConfig = mvcConfig;
    }
    public bool GetIsIndented()
    {
        return _mvcConfig.Formatting == Newtonsoft.Json.Formatting.Indented;
    }
}