deserialize json string depending on type

Question

Having json strings like this (I have no control over the publisher):

{
  "TypeName": "Type1"
}

{
  "TypeName": "Type1"
}

Is this an acceptable way to deserialize the json strings dynamically?:

public class DeserializationFactory
{
    public static IPoco GetEvent(string jsonString)
    {
        var o = JObject.Parse(jsonString);
        IPoco poco = null;
        switch (o["TypeName"].ToString())
        {
        case "Type1":
            poco = JsonConvert.DeserializeObject<Type1>(jsonString);
            break;

        case "Type2":
            poco = JsonConvert.DeserializeObject<Type2>(jsonString);
            break;
        }
        return poco;
    }
}

Are you saying you aren't sure which Poco you should deserialize to? — Greg, Feb 03 '16 at 16:53
You might want to do it with a `JsonConverter` in case your `IPoco` gets included in some higher level object. See http://stackoverflow.com/questions/19307752/deserializing-polymorphic-json-classes-without-type-information-using-json-net or http://stackoverflow.com/questions/29528648/json-net-serialization-of-type-with-polymorphic-child-object — dbc, Feb 03 '16 at 17:42

score 2 · Accepted Answer · answered Jun 20 '17 at 10:05

You can try with JsonSubtypes converter implementation and this layout:

    [JsonConverter(typeof(JsonSubtypes), "TypeName")]
    [JsonSubtypes.KnownSubType(typeof(Type1), "Type1")]
    [JsonSubtypes.KnownSubType(typeof(Type2), "Type2")]
    public interface IPoco
    {
        string TypeName { get; }
    }

    public class Type1 : IPoco
    {
        public string TypeName { get; } = "Type1";
        /* ... */
    }

    public class Type2 : IPoco
    {
        public string TypeName { get; } = "Type2";
        /* ... */
    }

deserialize json string depending on type

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