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我正在尝试将多态性与要序列化和反序列化的数据一起使用。但是,似乎多态属性在序列化时丢失了:

// Serialize
[System.Serializable]
public ParentClass()
{
  public string someString = "a string";
}
[System.Serializable]
public ChildClass() : ParentClass
{
  public int someInt;
  public ChildClass(int _someInt)
  {
    someInt = _someInt;
  }
}

List<ParentClass> list = new List<ParentClass>();
list.Add(new ChildClass(5));

// Data is serialized

// Data is deserialized

Debug.Log(list[0].someString);
// Output: a string; Works as intended

Debug.Log((list[0] as ChildClass).someInt));
// Null Reference Exception

在这种情况下,如何正确序列化这些类?

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