[何时在项目体系结构中使用继承？ [关闭]

Question

如果我在两个不同的类之间使用继承，那么这样做有什么缺点？我想知道这种方法是好的，那就是：将一层继承到另一层。

代码示例：a）LoginModel类别

public class LoginModel

    [Required]
    public string Username  get; set; 
    [Required]
    public string Password  get; set;

b）从LoginModel继承的LoginDal类

public class LoginDAL:LoginModel

    private readonly string SqlConnectionString;
    public LoginDAL()
    
        //logic to get connectionstring
    
    public DataTable GetLoginUser(out string ErrMsg, out bool IsSuccess)
        //logic to get login user from database

c）从LoginDAL继承的LoginBAL类

public class LoginBAL:LoginDAL

    public CommonDto<DataTable> GETlogin()
    
        string ErrorMessage = string.Empty;
        bool IsSuccess = false;
        DataTable DT = GetLoginUser(out ErrorMessage, out IsSuccess);
        if (IsSuccess && DT.Rows.Count > 0)
        
            return new CommonDto<DataTable>
            
                IsSuccess = true,
                Message = string.Empty,
                error_code = 0,
                Response = DT
            ;