使用Newtonsoft.Json的默认命名策略

使用Newtonsoft.Json的默认命名策略可以将返回结果的属性名转换为小写，使用下划线分隔。在将数据序列化为JSON格式返回时，可以通过在Startup类中配置JsonSerializerOptions来实现。示例如下：

using Microsoft.AspNetCore.Mvc;
using Newtonsoft.Json;

public class MyModel
{
    public string Prop1 { get; set; }
    public int Prop2 { get; set; }
}

[ApiController]
[Route("api/mycontroller")]
public class MyController : ControllerBase
{
    [HttpGet]
    public IActionResult Get()
    {
        var myModel = new MyModel
        {
            Prop1 = "Value 1",
            Prop2 = 2
        };

        var json = JsonConvert.SerializeObject(myModel); // 序列化成JSON字符串
        var myModelFromJson = JsonConvert.DeserializeObject(json); // 从JSON字符串反序列化成对象

        return Ok(myModel);
    }
}

public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddControllers()
            .AddNewtonsoftJson(options =>
            {
                options.SerializerSettings.ContractResolver = new Newtonsoft.Json.Serialization.CamelCasePropertyNamesContractResolver();
            });
    }

    public void Configure(IApplicationBuilder app)
    {
        // ...
        app.UseRouting();
        app.UseAuthorization();
        app.UseEndpoints(endpoints =>
        {
            endpoints.MapControllers();
        });
    }
}