BITKit/Packages/Runtime~/Unity/ECS/IdComponentConvert.cs

using System.Collections;
using System.Collections.Generic;
using BITKit;
using Unity.Entities;
using UnityEngine;

public interface IdProvider
{
    ulong Id { get; }
}
[System.Serializable]
public struct IdComponent:IComponentData
{
    public ulong   Id;
}
[System.Serializable]
public struct ConstId:IdProvider
{
    [SerializeField]
    private ulong Id;
    ulong IdProvider.Id => Id;
}

[System.Serializable]
public struct GetIdFromInstanceId : IdProvider
{
    [SerializeField] private GameObject gameObject;
    ulong IdProvider.Id => (ulong)gameObject.GetInstanceID();
}

public class IdComponentConvert : MonoBehaviour,ICovertToEntity
{
    [SerializeField, SerializeReference, SubclassSelector]
    private IdProvider provider;

    public void CovertToEntity(EntityManager entityManager, Entity entity)
    {
        var component = new IdComponent()
        {
            Id = provider.Id,
        };
        entityManager.AddComponentData(entity, component);
    }
}