SerializeWorld.cs

using UnityEngine;
using Unity.Entities;
using Unity.Entities.Serialization;
using Unity.Transforms;
using System.Threading.Tasks;
using Unity.Rendering;
#if UNITY_EDITOR
using UnityEditor;
#endif

public class SerializeWorldTestCode : MonoBehaviour
{
    [SerializeField]
    GameObject spawnObjects;

    [SerializeField]
    GameObject sharedComponentsInObject;

    public MeshInstanceRenderer[] renderers;

    private World localWorld;
    const string fileName = "savefile.sav";

    private const string prefabPath = "Assets/Serialize/SharedComponents.prefab";

    private void OnEnable()
    {
        localWorld = new World("local world");
        localWorld.GetOrCreateManager<EntityManager>();
    }

    private void OnDisable()
    {
        localWorld.Dispose();
    }

    public void OnClickSerialize()
    {
        var eManager = World.Active.GetExistingManager<EntityManager>();
        int[] sc;
        using (var writer = new StreamBinaryWriter(fileName))
        {
            SerializeUtility.SerializeWorld(eManager, writer, out sc);
            SerializeUtilityHybrid.Serialize(eManager, writer, out sharedComponentsInObject);
        }
#if UNITY_EDITOR
        PrefabUtility.CreatePrefab(prefabPath, sharedComponentsInObject);
        EditorUtility.RevealInFinder(prefabPath);
#endif
    }

    public async void OnclickDeserialize()
    {
        var eManager = localWorld.GetExistingManager<EntityManager>();

        var num = SerializeUtilityHybrid.DeserializeSharedComponents(eManager, sharedComponentsInObject, null);
        var transaction = eManager.BeginExclusiveEntityTransaction();
        await Task.Run(() =>
        {
            using (var reader = new StreamBinaryReader(fileName))
            {
                SerializeUtility.DeserializeWorld(transaction, reader, num);
            }
            SerializeUtilityHybrid.ReleaseSharedComponents(transaction, num);
        });
        eManager.EndExclusiveEntityTransaction();
        World.Active.GetExistingManager<EntityManager>().MoveEntitiesFrom(eManager);
    }

    public void Spawn()
    {
        var random = new Unity.Mathematics.Random((uint)Time.frameCount);
        var eManager = World.Active.GetExistingManager<EntityManager>();
        for (int i = 0; i < 100; i++)
        {
            var entity1 = eManager.Instantiate(spawnObjects);
            eManager.AddComponentData(entity1, new Position() { Value = random.NextFloat3(-1, 1) * 10 });
            var r = Random.Range(0, renderers.Length);
            eManager.AddSharedComponentData(entity1, renderers[r]);
        }
    }
}