Json.Net - Deserialized to an Enum in c#

Question

I am using Json.Net to deserialize

I have a c# class that has a property of this type of enum:

public enum MyEnum {
  House,   
  Cat,
  Dog
 }

The Json I have:

    "MyEnum ": "House",
    "MyEnum ": "Cat",
    "MyEnum ": "Doc<woof>"

House and Cat deserializes, but Dog<woof> of course doesn't. How can I get Json.Net to ignore or handle the woof ?

Perhaps a custom JsonConverter for this type/enum? (not sure though if JsonConverter can be used for customizing enum serialization, never did that myself...) — user2819245
– user2819245, Commented Sep 26, 2018 at 21:46
What happens now (e.g. exception is thrown)? What do you want to happen instead? — mjwills
– mjwills, Commented Sep 26, 2018 at 21:48
Why keep the <woof> part in the first place? An enum is the wrong type to use here if your values are not themselves valid enumerations. — Jeff Mercado
– Jeff Mercado, Commented Sep 26, 2018 at 21:50
Looks like a duplicate of How can I ignore unknown enum values during json deserialization?. Agree? — dbc
– dbc, Commented Sep 26, 2018 at 21:59

Eric Damtoft · Accepted Answer · 2018-09-26 22:04:44Z

3

You will need to define a custom JsonConverter. This might look something like this:

class MyEnumConverter : JsonConverter<MyEnum>
{
  public override MyEnum ReadJson(JsonReader reader, Type objectType, MyEnum existingValue, bool hasExistingValue, JsonSerializer serializer)
  {
    var token = reader.Value as string ?? reader.Value.ToString();
    var stripped = Regex.Replace(token, @"<[^>]+>", string.Empty);
    if (Enum.TryParse<MyEnum>(stripped, out var result))
    {
      return result;
    }
    return default(MyEnum);
  }

  public override void WriteJson(JsonWriter writer, MyEnum value, JsonSerializer serializer)
  {
    writer.WriteValue(value.ToString());
  }
}

Then decorate your enum with a [JsonConverter] attribute:

[JsonConverter(typeof(MyEnumConverter))]
enum MyEnum
{
  House,
  Dog,
  Cat,
}

answered Sep 26, 2018 at 22:04

Eric Damtoft

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