WebApi 返回小驼峰式 json 格式，并格式化日期

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;
        }
    }