¿Cómo puedo devolver camelCase JSON serializado por JSON.NET desde ASP.NET ¿Métodos de controlador MVC?

Mi problema es que deseo devolver datos JSON basados en camelCase (a diferencia del estándar PascalCase) a través de ActionResult s de ASP.NET Métodos de controlador MVC, serializados por JSON.NET .

Como ejemplo considere la siguiente clase C#: 

public class Person
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
}

De forma predeterminada, al devolver una instancia de esta clase desde un controlador MVC como JSON, se serializará de la siguiente manera:

{
  "FirstName": "Joe",
  "LastName": "Public"
}

Me gustaría que fuera serializado (por JSON.NET) as: 

{
  "firstName": "Joe",
  "lastName": "Public"
}

¿Cómo hago esto?

Author: aknuds1, 2013-10-18
Source

7 answers

O, en pocas palabras: 

JsonConvert.SerializeObject(
    <YOUR OBJECT>, 
    new JsonSerializerSettings 
    { 
        ContractResolver = new CamelCasePropertyNamesContractResolver() 
    });

Por ejemplo: 

return new ContentResult
{
    ContentType = "application/json",
    Content = JsonConvert.SerializeObject(new { content = result, rows = dto }, new JsonSerializerSettings { ContractResolver = new CamelCasePropertyNamesContractResolver() }),
    ContentEncoding = Encoding.UTF8
};
 271
Author: WebDever,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/ajaxhispano.com/template/agent.layouts/content.php on line 61
2016-12-11 20:43:23

Encontré una excelente solución a este problema en el blog de Mats Karlsson . La solución es escribir una subclase de ActionResult que serializa los datos a través de JSON.NET, configurando este último para seguir la convención camelCase: 

public class JsonCamelCaseResult : ActionResult
{
    public JsonCamelCaseResult(object data, JsonRequestBehavior jsonRequestBehavior)
    {
        Data = data;
        JsonRequestBehavior = jsonRequestBehavior;
    }

    public Encoding ContentEncoding { get; set; }

    public string ContentType { get; set; }

    public object Data { get; set; }

    public JsonRequestBehavior JsonRequestBehavior { get; set; }

    public override void ExecuteResult(ControllerContext context)
    {
        if (context == null)
        {
            throw new ArgumentNullException("context");
        }
        if (JsonRequestBehavior == JsonRequestBehavior.DenyGet && String.Equals(context.HttpContext.Request.HttpMethod, "GET", StringComparison.OrdinalIgnoreCase))
        {
            throw new InvalidOperationException("This request has been blocked because sensitive information could be disclosed to third party web sites when this is used in a GET request. To allow GET requests, set JsonRequestBehavior to AllowGet.");
        }

        var response = context.HttpContext.Response;

        response.ContentType = !String.IsNullOrEmpty(ContentType) ? ContentType : "application/json";
        if (ContentEncoding != null)
        {
            response.ContentEncoding = ContentEncoding;
        }
        if (Data == null)
            return;

        var jsonSerializerSettings = new JsonSerializerSettings
        {
            ContractResolver = new CamelCasePropertyNamesContractResolver()
        };
        response.Write(JsonConvert.SerializeObject(Data, jsonSerializerSettings));
    }
}

Luego use esta clase de la siguiente manera en su método de controlador MVC: 

public ActionResult GetPerson()
{
    return new JsonCamelCaseResult(new Person { FirstName = "Joe", LastName = "Public" }, JsonRequestBehavior.AllowGet)};
}
 85
Author: aknuds1,
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2013-10-18 10:58:41

Para WebAPI , echa un vistazo a este enlace: http://odetocode.com/blogs/scott/archive/2013/03/25/asp-net-webapi-tip-3-camelcasing-json.aspx

Básicamente, agregue este código a su Application_Start: 

var formatters = GlobalConfiguration.Configuration.Formatters;
var jsonFormatter = formatters.JsonFormatter;
var settings = jsonFormatter.SerializerSettings;
settings.ContractResolver = new CamelCasePropertyNamesContractResolver();
 52
Author: Assaf S.,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/ajaxhispano.com/template/agent.layouts/content.php on line 61
2015-02-05 06:33:17

Creo que esta es la respuesta simple que está buscando. Es del blog de Shawn Wildermuth : 

// Add MVC services to the services container.
services.AddMvc()
  .AddJsonOptions(opts =>
  {
    opts.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
  });
 30
Author: Quantium,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/ajaxhispano.com/template/agent.layouts/content.php on line 61
2016-01-06 21:30:11

Una alternativa al filtro personalizado es crear un método de extensión para serializar cualquier objeto en JSON.

public static class ObjectExtensions
{
    /// <summary>Serializes the object to a JSON string.</summary>
    /// <returns>A JSON string representation of the object.</returns>
    public static string ToJson(this object value)
    {
        var settings = new JsonSerializerSettings
        {
            ContractResolver = new CamelCasePropertyNamesContractResolver(),
            Converters = new List<JsonConverter> { new StringEnumConverter() }
        };

        return JsonConvert.SerializeObject(value, settings);
    }
}

Luego llámelo cuando regrese de la acción del controlador.

return Content(person.ToJson(), "application/json");
 7
Author: Stuart Hallows,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/ajaxhispano.com/template/agent.layouts/content.php on line 61
2016-05-25 07:58:28

En ASP.NET Núcleo MVC.

    public IActionResult Foo()
    {
        var data = GetData();

        var settings = new JsonSerializerSettings 
        { 
            ContractResolver = new CamelCasePropertyNamesContractResolver() 
        });

        return Json(data, settings);
    }
 7
Author: Fred,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/ajaxhispano.com/template/agent.layouts/content.php on line 61
2016-10-05 14:10:01

A continuación se muestra un método de acción que devuelve una cadena json (cameCase) al serializar una matriz de objetos.

public string GetSerializedCourseVms()
    {
        var courses = new[]
        {
            new CourseVm{Number = "CREA101", Name = "Care of Magical Creatures", Instructor ="Rubeus Hagrid"},
            new CourseVm{Number = "DARK502", Name = "Defence against dark arts", Instructor ="Severus Snape"},
            new CourseVm{Number = "TRAN201", Name = "Transfiguration", Instructor ="Minerva McGonal"}
        };
        var camelCaseFormatter = new JsonSerializerSettings();
        camelCaseFormatter.ContractResolver = new CamelCasePropertyNamesContractResolver();
        return JsonConvert.SerializeObject(courses, camelCaseFormatter);
    }

Tenga en cuenta la instancia JsonSerializerSettings pasada como segundo parámetro. Eso es lo que hace que suceda el camelCase.

 6
Author: DanKodi,
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2014-03-28 05:06:41