DbSet<T>.AddAsync正在对导致异常的标识列设置id值

using Microsoft.EntityFrameworkCore;
using System.Threading.Tasks;

public class MyDbContext : DbContext
{
    public DbSet<MyEntity> MyEntities { get; set; }

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        optionsBuilder.UseSqlServer("YourConnectionString");
    }
}

public class MyEntity
{
    public int Id { get; set; }
    public string Name { get; set; }
}

public class MyService
{
    private readonly MyDbContext _context;

    public MyService(MyDbContext context)
    {
        _context = context;
    }

    public async Task AddOrUpdateEntityAsync(MyEntity entity)
    {
        var existingEntity = await _context.MyEntities.FindAsync(entity.Id);

        if (existingEntity == null)
        {
            // 如果记录不存在，添加新记录
            await _context.MyEntities.AddAsync(entity);
        }
        else
        {
            // 如果记录存在，更新现有记录
            existingEntity.Name = entity.Name;
        }

        await _context.SaveChangesAsync();
    }
}