Automatically apply JsonConverter attribute to all properties of type

Question

I have a custom JsonConverter for DateTimeOffset properties in my ViewModels. I have 100+ ViewModels.

public class ItemViewModel { public string Name { get; set; } [JsonConverter(typeof(CustomDateTimeOffsetConverter))] public DateTimeOffset DateCreated { get; set; } }

How can I apply this attribute to all DateTimeOffset properties, without adding it to all my ViewModels?

I thought I had the solution when I read this answer, but when I apply it, the CustomResolver only fires on the parent object itself, and not the DateTimeOffset property, or any property.

public class CustomResolver : DefaultContractResolver { protected override JsonObjectContract CreateObjectContract(Type objectType) { JsonObjectContract contract = base.CreateObjectContract(objectType); if (objectType == typeof(DateTimeOffset)) { contract.Converter = new CustomDateTimeOffsetConverter(); } return contract; } }

So to recap, I have everything else working. If I add the [JsonConverter(typeof(CustomDateTimeOffsetConverter))] attribute manually, then my application works like a charm. I am only asking how to add the attribute automatically, instead of manually.

if you mean without applying the attribute you want to serialize the object?? use the Newtonsoft.json install this package from NuGet — Deepak Sharma
– Deepak Sharma, Commented Nov 10, 2015 at 9:10

toadflakz · Accepted Answer · 2015-11-10 09:10:02Z

You need to add the converter to the JsonSerializerSettings.Converters passed to the serializer.

Your JsonSerializerSettings will look as follows:

var settings = new JsonSerializerSettings() { Converters = { new CustomDateTimeOffsetConverter() } };

Your custom converter should also advertise it can convert the DateTimeOffset type with the following override of the JsonConverter method:

public override bool CanConvert(Type objectType) { return (objectType == typeof(DateTimeOffset)); }

To set the converter globally, see How to tell Json.Net globally to apply the StringEnumConverter to all enums.

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