TableEntity missing Serializable or DataContract attribute

Question

Why isn’t the TableEntity class annotated with either the SerializableAttribute or DataContractAttribute? This would be very helpful considering TableEntity needs to be the base class for Table Entities and no derived classes will serialize without the base class serialize Attribute.

Answer 1

Posting as Answer since there is a 1000-character limit on comments

@Dan I am not able to repro this.
Here is a simple test I set up using your pseudo code. I am able to serialize without any issues.
Please let me know if I am missing something here.

using Microsoft.Azure.Cosmos.Table;  
using System;  
using System.ComponentModel;  
using System.Runtime.Serialization;  
  
namespace ConsoleApp1  
{  
    [DataContract]  
    public class ModelBase : TableEntity, INotifyPropertyChanged  
    {  
        // base-shared logic  
  
        public string BaseClassProperty { get; set; }  
  
        public event PropertyChangedEventHandler PropertyChanged;  
    }  
  
    [DataContract]  
    public class User : ModelBase  
    {  
        public string DerivedClassProperty { get; set; }  
    }  
  
    internal class Program  
    {  
        private static void Main(string[] args)  
        {  
            var user = new User  
            {  
                PartitionKey = Guid.NewGuid().ToString(),  
                RowKey = Guid.NewGuid().ToString(),  
                BaseClassProperty = "BaseClassProperty",  
                DerivedClassProperty = "DerivedClassProperty"  
            };  
  
            var serializedData = System.Text.Json.JsonSerializer.Serialize(user);  
  
            Console.WriteLine(serializedData);  
        }  
    }  
}