使用Netonsoft执行模型绑定时，我具有.Net Core 3 Api。

public class Startup
{
    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public IConfiguration Configuration { get; }

    public void ConfigureServices(IServiceCollection services)
    {
        services.Configure<KestrelServerOptions>(options => { options.AllowSynchronousIO = true; });
        services.Configure<IISServerOptions>(options => { options.AllowSynchronousIO = true; });
        services.AddOptions();
        services.AddMvcCore().SetCompatibilityVersion(CompatibilityVersion.Version_3_0).AddNewtonsoftJson();
        services.AddHealthChecks()
            .AddCheck<ApiHealthCheck>("api");

    }
    public void Configure(IApplicationBuilder app,IWebHostEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        app.UseRouting();
        app.UseAuthentication();
        app.UseAuthorization();
        app.UseEndpoints(endpoints => { endpoints.MapControllers(); });
        app.UseHealthChecks("/health");
    }
}

在Api中，我期望一个类似的模型：

public class Family
{
    public Member Member1 { get; set; }
    public Member Member2 { get; set; }
}

public class Member
{
    public string FirstName { get; set; }
    public List<string> LastNames { get; set; }
}

现在，当我发布以下Json时，模型绑定为我提供了一个家庭对象，该对象具有从Json中获取的值：

{
    "member1": {
        "firstName": "john","lastNames": [
            "wick"
        ]
    },"member2": {
        "firstName": "Rich","lastNames": null
    }
}

但是，当我发布以下Json（姓氏值是字符串而不是数组）时：

{
    "member1": {
        "firstName": "john","lastNames": "wick"
    },"member2": {
        "firstName": "Rich"
    }
}

我希望获得一个成员为Member1的Family对象，而成员2仅具有名字。

但是我得到的是空值（在收到的模型中找不到家庭）。

这种行为应该发生吗？以及如何告诉Newtonsoft仅忽略姓氏而不是整个模型？