from:http://blog.csdn.net/magiccops/article/details/42969363

 

  屏蔽默认返回xml格式：Global文件加：GlobalConfiguration.Configuration.Formatters.XmlFormatter.SupportedMediaTypes.Clear(); 

 

 

在 WebApiConfig 类中增加方法ConfigureApi，并在 Register 方法最后调用一下    ConfigureApi(config);    

增加一个实现IContentNegotiator 接口的类 JsonContentNegotiator

详细如下：

 public static void ConfigureApi(HttpConfiguration config)

        {

            var jsonFormatter = new JsonMediaTypeFormatter();

            var settings = jsonFormatter.SerializerSettings;

            IsoDateTimeConverter timeConverter = new IsoDateTimeConverter();

            //这里使用自定义日期格式

            timeConverter.DateTimeFormat = "yyyy'-'MM'-'dd' 'HH':'mm':'ss";

            settings.Converters.Add(timeConverter);

            settings.ContractResolver = new CamelCasePropertyNamesContractResolver();

            config.Services.Replace(typeof(IContentNegotiator), new JsonContentNegotiator(jsonFormatter));   

        }

  public class JsonContentNegotiator : IContentNegotiator

    {

        private readonly JsonMediaTypeFormatter _jsonFormatter;

        public JsonContentNegotiator(JsonMediaTypeFormatter formatter)

        {

            _jsonFormatter = formatter;

        }

        public ContentNegotiationResult Negotiate(Type type, HttpRequestMessage request, IEnumerable<MediaTypeFormatter> formatters)

        {

            var result = new ContentNegotiationResult(_jsonFormatter, new MediaTypeHeaderValue("application/json"));

            return result;

        }

    }