WebApi返回Json

参考地址:http://www.cnblogs.com/acles/archive/2013/06/21/3147667.html

 public static void Register(HttpConfiguration config)
        {
            config.Routes.MapHttpRoute(
                name: "ApiV1",
                routeTemplate: "datasvc/v1/{action}",
                defaults: new { controller = "ApiV1" }
            );
            config.EnableSystemDiagnosticsTracing();

            var jsonFormatter = new JsonMediaTypeFormatter();
            config.Services.Replace(typeof(IContentNegotiator), new 
              JsonContentNegotiator(jsonFormatter));
        }

 

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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;
        }
    }