Question

我想使用Web API返回带有驼峰的JSON数据。我继承了一个项目的混乱，使用了以前程序员当前使用的任何外壳（严重的是！所有的帽子，小写，帕斯卡套管和骆驼套管 - 请你选择！），所以我不能使用把它放在WebApiConfig.cs文件中的技巧，因为它会破坏现有的API调用：

// Enforce camel-casing for the JSON objects being returned from API calls.
config.Formatters.OfType<JsonMediaTypeFormatter>().First().SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();

所以我使用了一个使用JSON.Net序列化程序的自定义类。这是代码：

using System.Web.Http;
using Newtonsoft.Json;
using Newtonsoft.Json.Serialization;

public class JsonNetApiController : ApiController
{
    public string SerializeToJson(object objectToSerialize)
    {
        var settings = new JsonSerializerSettings
        {
            ContractResolver = new CamelCasePropertyNamesContractResolver()
        };

        if (objectToSerialize != null)
        {
            return JsonConvert.SerializeObject(objectToSerialize, Formatting.None, settings);
        }

        return string.Empty;
    }
}

问题是返回的原始数据如下所示：

"[{\"average\":54,\"group\":\"P\",\"id\":1,\"name\":\"Accounting\"}]"

正如你所看到的，反斜杠搞得一团糟。以下是我使用自定义类调用的方式：

public class Test
{
    public double Average { get; set; }
    public string Group { get; set; }
    public int Id { get; set; }
    public string Name { get; set; }
}

public class SomeController : JsonNetApiController
{
    public HttpResponseMessage Get()

    var responseMessage = new List<Test>
    {
        new Test
        {
            Id = 1,
            Name = "Accounting",
            Average = 54,
            Group = "P",
        }
    };

    return Request.CreateResponse(HttpStatusCode.OK, SerializeToJson(responseMessage), JsonMediaTypeFormatter.DefaultMediaType);

}

我能做些什么来摆脱反斜杠？有没有其他方法来强制执行骆驼套管？

Answer 1

感谢所有对其他Stackoverflow页面的引用，我将发布三个解决方案，以便其他有类似问题的人可以选择代码。第一个代码示例是我在查看其他人正在做的事情之后创建的代码示例。最后两个来自其他Stackoverflow用户。我希望这有助于其他人！

// Solution #1 - This is my solution. It updates the JsonMediaTypeFormatter whenever a response is sent to the API call.
// If you ever need to keep the controller methods untouched, this could be a solution for you.
using System;
using System.Net;
using System.Net.Http;
using System.Net.Http.Formatting;
using System.Web.Http;
using Newtonsoft.Json.Serialization;

public class CamelCasedApiController : ApiController
{
    public HttpResponseMessage CreateResponse(object responseMessageContent)
    {
        try
        {
            var httpResponseMessage = Request.CreateResponse(HttpStatusCode.OK, responseMessageContent, JsonMediaTypeFormatter.DefaultMediaType);
            var objectContent = httpResponseMessage.Content as ObjectContent;

            if (objectContent != null)
            {
                var jsonMediaTypeFormatter = new JsonMediaTypeFormatter
                {
                    SerializerSettings =
                    {
                        ContractResolver = new CamelCasePropertyNamesContractResolver()
                    }
                };

                httpResponseMessage.Content = new ObjectContent(objectContent.ObjectType, objectContent.Value, jsonMediaTypeFormatter);
            }

            return httpResponseMessage;
        }
        catch (Exception exception)
        {
            return Request.CreateResponse(HttpStatusCode.InternalServerError, exception.Message);
        }
    }
}

第二个解决方案使用一个属性来修饰API控制器方法。

// http://stackoverflow.com/questions/14528779/use-camel-case-serialization-only-for-specific-actions
// This code allows the controller method to be decorated to use camel-casing. If you can modify the controller methods, use this approach.
using System.Net.Http;
using System.Net.Http.Formatting;
using System.Web.Http.Filters;
using Newtonsoft.Json.Serialization;

public class CamelCasedApiMethodAttribute : ActionFilterAttribute
{
    private static JsonMediaTypeFormatter _camelCasingFormatter = new JsonMediaTypeFormatter();

    static CamelCasedApiMethodAttribute()
    {
        _camelCasingFormatter.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
    }

    public override void OnActionExecuted(HttpActionExecutedContext httpActionExecutedContext)
    {
        var objectContent = httpActionExecutedContext.Response.Content as ObjectContent;
        if (objectContent != null)
        {
            if (objectContent.Formatter is JsonMediaTypeFormatter)
            {
                httpActionExecutedContext.Response.Content = new ObjectContent(objectContent.ObjectType, objectContent.Value, _camelCasingFormatter);
            }
        }
    }
}

// Here is an example of how to use it.
[CamelCasedApiMethod]
public HttpResponseMessage Get()
{
    ...
}

最后一个解决方案使用一个属性来装饰整个API控制器。

// http://stackoverflow.com/questions/19956838/force-camalcase-on-asp-net-webapi-per-controller
// This code allows the entire controller to be decorated to use camel-casing. If you can modify the entire controller, use this approach.
using System;
using System.Linq;
using System.Net.Http.Formatting;
using System.Web.Http.Controllers;
using Newtonsoft.Json.Serialization;

public class CamelCasedApiControllerAttribute : Attribute, IControllerConfiguration
{
    public void Initialize(HttpControllerSettings httpControllerSettings, HttpControllerDescriptor httpControllerDescriptor)
    {
        var jsonMediaTypeFormatter = httpControllerSettings.Formatters.OfType<JsonMediaTypeFormatter>().Single();
        httpControllerSettings.Formatters.Remove(jsonMediaTypeFormatter);

        jsonMediaTypeFormatter = new JsonMediaTypeFormatter
        {
            SerializerSettings =
            {
                ContractResolver = new CamelCasePropertyNamesContractResolver()
            }
        };

        httpControllerSettings.Formatters.Add(jsonMediaTypeFormatter);
    }
}

// Here is an example of how to use it.
[CamelCasedApiController]
public class SomeController : ApiController
{
    ...
}

Answer 2

如果要全局设置，可以从 HttpConfiguration 中删除当前的Json格式化程序，并将其替换为您自己的格式化程序。

public static void Register(HttpConfiguration config)
{
    config.Formatters.Remove(config.Formatters.JsonFormatter);

    var serializer = new JsonSerializerSettings { ContractResolver = new CamelCasePropertyNamesContractResolver() };
    var formatter = new JsonMediaTypeFormatter { Indent = true, SerializerSettings =  serializer };
    config.Formatters.Add(formatter);
}

Answer 3

评论https://stackoverflow.com/a/26506573/887092适用于某些情况，但不适用于其他情况

var jsonFormatter = GlobalConfiguration.Configuration.Formatters.JsonFormatter;

这种方式适用于其他情况

var jsonFormatter = config.Formatters.OfType<JsonMediaTypeFormatter>().First();

所以，用以下内容覆盖所有基地：

    private void ConfigureWebApi(HttpConfiguration config)
    {
        //..

        foreach (var jsonFormatter in config.Formatters.OfType<JsonMediaTypeFormatter>())
        {
            jsonFormatter.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
        }

        var singlejsonFormatter = GlobalConfiguration.Configuration.Formatters.JsonFormatter;
        singlejsonFormatter.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();

    }

使用JSON.Net的Web API的Camel-Casing问题

3 个答案: