本文轉(zhuǎn)自：http://www.howtobuildsoftware.com/index.php/how-do/cg8K/jsonnet-newtonsoft-json-how-to-dynamically-change-the-date-format

I'm using Newtonsoft JSON Serializer and it's great and super fast but I'd like to do a bit more with it. I'm not sure it's possible as all the search I've done comes up to nothing. What I would like is to be able to truncate empty time, so when it's display 2014-01-01 00:00:00.000 I just want 2014-01-01 at the end, so basically cut the entire time when they're all zeros. For now I use this piece of code:

DataTable dt = loadData();// encode the string with Newton JSON.Net string output = JsonConvert.SerializeObject(dt,new JsonSerializerSettings{ReferenceLoopHandling = ReferenceLoopHandling.Ignore,Formatting = Newtonsoft.Json.Formatting.None,DateFormatString = "yyyy-MM-dd HH:mm:ss"});

Is there a way to format these dates without the time (only when they are all zeros) without affecting the performance?

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Best How To :

????????????????

You can do this with a custom JsonConverter:

class CustomDateConverter : JsonConverter {public override bool CanConvert(Type objectType){return (objectType == typeof(DateTime));}public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer){DateTime date = (DateTime)value;string format = "yyyy-MM-dd HH:mm:ss";if (date.Hour == 0 && date.Minute == 0 && date.Second == 0 && date.Millisecond == 0){format = "yyyy-MM-dd";}writer.WriteValue(date.ToString(format));}public override bool CanRead{get { return false; }}public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer){throw new NotImplementedException();} }

Demo:

class Program {static void Main(string[] args){List<DateTime> dates = new List<DateTime>{DateTime.Now,DateTime.Today};JsonSerializerSettings settings = new JsonSerializerSettings{ReferenceLoopHandling = ReferenceLoopHandling.Ignore,Formatting = Newtonsoft.Json.Formatting.None,Converters = new List<JsonConverter> { new CustomDateConverter() }};string json = JsonConvert.SerializeObject(dates, settings);Console.WriteLine(json);} }

Output:

["2014-06-11 11:56:28","2014-06-11"]

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