如何在反序列化之前拦截数据类型，当它到达WEB API时？

Question

我们需要一种机制，以便当特定的数据类型（比如日期时间）到达Web API时，我们应该能够拦截它和它。对该数据执行一些业务逻辑转换。

  

对于响应我们已经能够实现如下，但需要你的   有关如何拦截请求的帮助？

我尝试了什么？ DateTimeConverter类：

 public class DateTimeConverter : JsonConverter
    {
        public override bool CanConvert(Type objectType)
        {
            return objectType == typeof(DateTime);
        }
        public override bool CanRead
        {
            get
            {
                return false;
            }
        }
        public override bool CanWrite
        {
            get
            {
                return true;
            }
        }
        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
        {
            var timeUtc = (DateTime)value;
            TimeZoneInfo easternZone = TimeZoneInfo.FindSystemTimeZoneById("Eastern Standard Time");
            DateTime easternTime = TimeZoneInfo.ConvertTimeFromUtc(timeUtc, easternZone);
            writer.WriteValue(easternTime);
        }
        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
        {
            // the default deserialization works fine, 
            // but otherwise we'd handle that here
            throw new NotImplementedException();
        }
    }

注册： -

 protected void Application_Start()
    {
        GlobalConfiguration.Configure(WebApiConfig.Register);
        var formatters = GlobalConfiguration.Configuration.Formatters;
        var jsonFormatter = formatters.JsonFormatter;
        jsonFormatter.SerializerSettings.Converters.Add(new TimeSpanConverter());

        jsonFormatter.SerializerSettings.Converters.Add(new DateTimeConverter());
    }