VCommonCore/VCommon.VEntity/VEntityBase.cs

using System;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace VCommon.VEntity
{
    public abstract class VEntityBase
    {
        private string _keyField; //EF Core Trick? must difference with prop name for init

        [Key, MinLength(36), MaxLength(36), DatabaseGenerated(DatabaseGeneratedOption.None)]
        public string Id
        {
            get
            {
                if (string.IsNullOrWhiteSpace(_keyField)) _keyField = Guid.NewGuid().ToString();
                return _keyField;
            }
            set => _keyField = value;
        }
    }
}