How to Deserialize JSON into an `IEnumerable` using Newtonsoft JSON.NET?

Use Newtonsoft JSON.NET to deserialize JSON to IEnumerable

Assume that JSON represents a list of objects with polymorphic types:

<code>[
  {
    "$id": "1",
    "$type": "MyAssembly.ClassA, MyAssembly",
    "Email": "[email protected]"
  },
  {
    "$id": "2",
    "$type": "MyAssembly.ClassB, MyAssembly",
    "Email": "[email protected]"
  }
]</code>

and abstract base and derived classes:

<code>public abstract class BaseClass
{
    public string Email;
}
public class ClassA : BaseClass
{
}
public class ClassB : BaseClass
{
}</code>

Deserialize JSON to IEnumerable

To deserialize JSON to IEnumerable, follow these steps:

1. Enable TypeNameHandling: Set the TypeNameHandling of JsonSerializerSettings to All to include type information in the deserialized JSON.

   <code> JsonSerializerSettings settings = new JsonSerializerSettings
    {
        TypeNameHandling = TypeNameHandling.All
    };</code>

2. Serialized JSON: Serializes a list of objects using configured settings.

   <code> string strJson = JsonConvert.SerializeObject(instance, settings);</code>

3. Modified JSON: The serialized JSON will contain $type information, and the generated JSON will look like this:

   <code> {
      "$type": "System.Collections.Generic.List`1[[MyAssembly.BaseClass, MyAssembly]], mscorlib",
      "$values": [
        {
          "$id": "1",
          "$type": "MyAssembly.ClassA, MyAssembly",
          "Email": "[email protected]"
        },
        {
          "$id": "2",
          "$type": "MyAssembly.ClassB, MyAssembly",
          "Email": "[email protected]"
        }
      ]
    }</code>

4. Deserialize JSON: Deserialize modified JSON to base class using settings with TypeNameHandling enabled.

   <code> IEnumerable<BaseClass> obj = JsonConvert.DeserializeObject<IEnumerable<BaseClass>>(strJson, settings);</code>

By following these steps, you can successfully deserialize JSON to IEnumerable, including objects with polymorphic types.

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