在使用Scaffolding时，如果要保留数据注释，可以使用以下方法：

首先，在实体类中添加数据注释：

public class MyEntity { [Key] public int Id { get; set; }

[Required(ErrorMessage = "Name is required")]
[MaxLength(100, ErrorMessage = "Name can't be longer than 100 characters")]
public string Name { get; set; }

[Range(1, 10, ErrorMessage = "Number must be between 1 and 10")]
public int Number { get; set; }

}

接下来，在执行Scaffolding命令时，添加参数--data-annotations：

Scaffold-DbContext "Data Source=MyDatabase.db" Microsoft.EntityFrameworkCore.Sqlite --data-annotations -OutputDir Models

这样，在生成的代码中，就会保留数据注释，如下所示：

public partial class MyEntity { [Key] public int Id { get; set; }

[Required(ErrorMessage = "Name is required")]
[MaxLength(100, ErrorMessage = "Name can't be longer than 100 characters")]
public string Name { get; set; }

[Range(1, 10, ErrorMessage = "Number must be between 1 and 10")]
public int Number { get; set; }

}