✅ DataContractSerializer with polymorphisme

<?xml version="1.0" encoding="utf-8" ?>
<DataBase>
  <Movie Title="Matrix">
    <Duration>110</Duration>
  </Movie>
  <Movie Title="IronMan">
  </Movie>
  <Movie Title="Test">
  </Movie>
</DataBase>

[DataContract(Name = "DataBase", Namespace = "")]
public class VideoDataBase
{
    [DataMember] // ????
    public List<Movie> Movies { get; set; }
    
    [OnDeserializing]
    public void OnDeserializing(StreamingContext context)
    {
        Console.WriteLine("Database on Deserializing");
    }
    
    [OnDeserialized]
    public void OnDeserialized(StreamingContext context)
    {
        Console.WriteLine("Database has been deserialized");
    }
    

}

[DataContract]
[KnownType(typeof(Movie))]
public abstract class VideoDatabaseItem
{
    [DataMember]
    public string Title { get; set; }
    
    [OnDeserializing]
    public void OnDeserializing(StreamingContext context)
    {
        Console.WriteLine("VideoDatabaseItem on Deserializing");
    }

}

[DataContract]
public class Movie : VideoDatabaseItem
{
    [DataMember(Name = "Duration")]
    public string Duration { get; set; }
    
    [DataMember(Name = "Title")]
    public string Title { get; set; }
    
    [OnDeserializing]
    public new void OnDeserializing(StreamingContext context)
    {
        Console.WriteLine("Movie on Deserializing");
    }
}