107

ASP.NET Web API 默认进行内容协商 - 将根据Accept标头返回 XML 或 JSON 或其他类型。我不需要/想要这个,有没有办法(比如属性或其他东西)告诉 Web API 总是返回 JSON?

4

10 回答 10

172

清除所有格式化程序并重新添加 Json 格式化程序。

GlobalConfiguration.Configuration.Formatters.Clear();
GlobalConfiguration.Configuration.Formatters.Add(new JsonMediaTypeFormatter());

编辑

我把它加到Global.asax里面了Application_Start()

于 2012-09-27T20:13:17.173 回答
76

在 ASP.NET Web API 中仅支持 JSON –正确的方式

将 IContentNegotiator 替换为 JsonContentNegotiator:

var jsonFormatter = new JsonMediaTypeFormatter();
//optional: set serializer settings here
config.Services.Replace(typeof(IContentNegotiator), new JsonContentNegotiator(jsonFormatter));

JsonContentNegotiator 实现:

public class JsonContentNegotiator : IContentNegotiator
{
    private readonly JsonMediaTypeFormatter _jsonFormatter;

    public JsonContentNegotiator(JsonMediaTypeFormatter formatter) 
    {
        _jsonFormatter = formatter;    
    }

    public ContentNegotiationResult Negotiate(
            Type type, 
            HttpRequestMessage request, 
            IEnumerable<MediaTypeFormatter> formatters)
    {
        return new ContentNegotiationResult(
            _jsonFormatter, 
            new MediaTypeHeaderValue("application/json"));
    }
}
于 2013-08-09T11:23:47.760 回答
11

Philip W 有正确的答案,但为了清晰和完整的工作解决方案,编辑您的 Global.asax.cs 文件如下所示:(注意我必须将参考 System.Net.Http.Formatting 添加到库存生成的文件中)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http.Formatting;
using System.Web;
using System.Web.Http;
using System.Web.Mvc;
using System.Web.Optimization;
using System.Web.Routing;

namespace BoomInteractive.TrainerCentral.Server {
    // Note: For instructions on enabling IIS6 or IIS7 classic mode, 
    // visit http://go.microsoft.com/?LinkId=9394801

    public class WebApiApplication : System.Web.HttpApplication {
        protected void Application_Start() {
            AreaRegistration.RegisterAllAreas();

            WebApiConfig.Register(GlobalConfiguration.Configuration);
            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
            RouteConfig.RegisterRoutes(RouteTable.Routes);
            BundleConfig.RegisterBundles(BundleTable.Bundles);

            //Force JSON responses on all requests
            GlobalConfiguration.Configuration.Formatters.Clear();
            GlobalConfiguration.Configuration.Formatters.Add(new JsonMediaTypeFormatter());
        }
    }
}
于 2014-05-01T18:45:07.683 回答
11
GlobalConfiguration.Configuration.Formatters.XmlFormatter.SupportedMediaTypes.Clear();

这将清除 XML 格式化程序,因此默认为 JSON 格式。

于 2016-01-17T00:00:51.080 回答
4

受到 Dmitry Pavlov 出色答案的启发,我对其稍作修改,以便可以插入任何我想强制执行的格式化程序。

归功于德米特里。

/// <summary>
/// A ContentNegotiator implementation that does not negotiate. Inspired by the film Taken.
/// </summary>
internal sealed class LiamNeesonContentNegotiator : IContentNegotiator
{
    private readonly MediaTypeFormatter _formatter;
    private readonly string _mimeTypeId;

    public LiamNeesonContentNegotiator(MediaTypeFormatter formatter, string mimeTypeId)
    {
        if (formatter == null)
            throw new ArgumentNullException("formatter");

        if (String.IsNullOrWhiteSpace(mimeTypeId))
            throw new ArgumentException("Mime type identifier string is null or whitespace.");

        _formatter = formatter;
        _mimeTypeId = mimeTypeId.Trim();
    }

    public ContentNegotiationResult Negotiate(Type type, HttpRequestMessage request, IEnumerable<MediaTypeFormatter> formatters)
    {
        return new ContentNegotiationResult(_formatter, new MediaTypeHeaderValue(_mimeTypeId));
    }
}
于 2014-03-26T18:23:55.190 回答
3

这设置了正确的标题。显得优雅一些。

public JsonResult<string> TestMethod() 
{
return Json("your string or object");
}
于 2017-07-24T08:40:29.747 回答
2

如果您只想对一种方法执行此操作,则将您的方法声明为返回HttpResponseMessage而不是IEnumerable<Whatever>执行:

    public HttpResponseMessage GetAllWhatever()
    {
        return Request.CreateResponse(HttpStatusCode.OK, new List<Whatever>(), Configuration.Formatters.JsonFormatter);
    }

这段代码对于单元测试来说很痛苦,但也可以这样:

    sut = new WhateverController() { Configuration = new HttpConfiguration() };
    sut.Configuration.Formatters.Add(new Mock<JsonMediaTypeFormatter>().Object);
    sut.Request = new HttpRequestMessage();
于 2013-10-30T14:11:24.143 回答
1

对于那些使用 OWIN

GlobalConfiguration.Configuration.Formatters.Clear();
GlobalConfiguration.Configuration.Formatters.Add(new JsonMediaTypeFormatter());

变为(在 Startup.cs 中):

   public void Configuration(IAppBuilder app)
        {
            OwinConfiguration = new HttpConfiguration();
            ConfigureOAuth(app);

            OwinConfiguration.Formatters.Clear();
            OwinConfiguration.Formatters.Add(new DynamicJsonMediaTypeFormatter());

            [...]
        }
于 2018-09-26T11:10:41.187 回答
0

哟可以在 WebApiConfig.cs 中使用:

config.Formatters.JsonFormatter.SupportedMediaTypes.Add(new MediaTypeHeaderValue("text/html"));
于 2017-04-12T08:26:41.693 回答
0
 public System.Web.Http.Results.JsonResult<MeineObjekt> Get()
    {
        return Json(new MeineObjekt()
        {
            Cod = "C4666",               
            Payment = 10.0m,
            isEnough = false
        });
    }
于 2021-04-07T20:58:26.293 回答