JsonSerializerSettings settings = new JsonSerializerSettings();    //EF Core中默认为驼峰样式序列化处理key    //settings.ContractResolver = new CamelCasePropertyNamesContractResolver();    //使用默认方式，不更改元数据的key的大小写    settings.ContractResolver = new DefaultContractResolver();    return Json(data, settings);

全局设置，Json序列化配置

public void ConfigureServices(IServiceCollection services){    // Add framework services.    services.AddMvc()        //全局配置Json序列化处理        .AddJsonOptions(options =>        {            //忽略循环引用            options.SerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;            //不更改元数据的key的大小写            options.SerializerSettings.ContractResolver = new DefaultContractResolver();        }        );}