Json.Net-在C＃中反序列化为枚举

Question

I am using Json.Net to deserialize

I have ac# 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 ?

Answer 1

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,
}