How to add types information to JSON on serialization?


Angular requires Date objects in many places whereas JSON contains string representation of the date.

I want to add an array of properties which contain date values:

class Foo { public int IntProp {get;set;} public DateTime? Prop1 {get;set;} public DateTime Prop2 {get;set;} public Bar Bar {set;set;} } class Bar { public DateTime Prop {get;set;} public IEnumerable<DateTime?> Dates {get;set;} }

Foo should then be serialized like this:

{ "IntProp": 1, "Prop1": "...", "Prop2": "...", "Bar": { "Prop": "..." }, "<Dates>": [ "Prop1", "Prop2", "Bar.Prop", "Bar.Dates"] }

This allows me to automatically convert strings to date objects at the client side without testing every property whether it is convertible to Date like it is described in this <a href="https://stackoverflow.com/q/22435212/921054" rel="nofollow">question</a>.

I can collect the paths of date properties, but have no idea how to add populated array to the root.


You could convert to an intermediate <a href="http://www.newtonsoft.com/json/help/html/T_Newtonsoft_Json_Linq_JObject.htm" rel="nofollow">JObject</a> and add the property there. For instance, given the following converter:

public class PathLoggingDateTimeConverter : IsoDateTimeConverter { public const string DatePathPropertyName = "<Dates>"; readonly List<string> paths = new List<string>(); public override bool CanConvert(Type objectType) { if (!base.CanConvert(objectType)) return false; // Not for DateTimeOffset return objectType == typeof(DateTime) || objectType == typeof(DateTime?); } public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer) { base.WriteJson(writer, value, serializer); if (value != null) paths.Add(writer.Path); } public IList<string> Paths { get { return paths; } } }

You can do:

var root = new Foo { IntProp = 101, Prop1 = DateTime.Today.ToUniversalTime(), Prop2 = DateTime.Today.ToUniversalTime(), Bar = new Bar { Prop = DateTime.Today.ToUniversalTime(), Dates = new List<DateTime?> { null, DateTime.Today.ToUniversalTime() }, }, }; var converter = new PathLoggingDateTimeConverter(); var settings = new JsonSerializerSettings { Converters = new[] { converter } }; var obj = JObject.FromObject(root, JsonSerializer.CreateDefault(settings)); obj[PathLoggingDateTimeConverter.DatePathPropertyName] = JToken.FromObject(converter.Paths); Console.WriteLine(obj);

And the result is:

{ "IntProp": 101, "Prop1": "2016-10-25T04:00:00Z", "Prop2": "2016-10-25T04:00:00Z", "Bar": { "Prop": "2016-10-25T04:00:00Z", "Dates": [ null, "2016-10-25T04:00:00Z" ] }, "<Dates>": [ "Prop1", "Prop2", "Bar.Prop", "Bar.Dates[1]" ] }


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