Question

我有以下ViewModel，它是继承它的其他ViewModel的基类。

将viewmdoel映射到viewmodel的方法放在自己的位置是不是一个好主意？

像这样：

public class ShowQuestionViewModel
    {
        public ShowQuestionViewModel()
        {

        }

        public int Question_ID { get; set; }

        public Boolean Condition_Fullfilled;

        public String requiredmessage = "";

        [Required(ErrorMessage = "Dette felt er påkrævet")]
        public String Question_Wording { get; set; }

        public String Question_Type { get; set; }

        [Required(ErrorMessage = "Dette felt er påkrævet")]
        //[Digits(ErrorMessage = "Feltet må kun indeholde heltal")]
        public String Question_Number { get; set; }

        public String Left_scale { get; set; }
        public String Right_scale { get; set; }
        public int Scale_Length { get; set; }
        public String Left_Scale_HelpText { get; set; }
        public String Right_Scale_HelpText { get; set; }

        public Boolean Visible { get; set; }
        public Boolean IsAnswered { get; set; }
        public String Question_HelpText { get; set; }
        public String Question_HelpText_PDF { get; set; }
        public int Category_ID { get; set; }

        // Ting der er behov for til Views
        public SelectList Categories { get; set; }
        public SelectList Visibility { get; set; }
        public string RefUrl { get; set; }

        public void MapQuestionToViewModel(MvcApplication3.Models.Question question)
        {
            Question_ID = question.question_id;
            Category_ID = Convert.ToInt32(question.category_id);
            Question_Number = question.question_number.ToString();
            Question_Wording = question.question_wording;
            Visible = (bool)question.visible;

            String hlptxt = question.help_text;

            Question_HelpText = hlptxt;

            Question_HelpText_PDF = question.help_text_pdf ?? "";

            Left_scale = question.left_scale;
            Right_scale = question.right_scale;
            Scale_Length = question.scale_length ?? 0;

            Left_Scale_HelpText = question.left_scale_hlptxt;
            Right_Scale_HelpText = question.right_scale_hlptxt;

            Question_Type = question.Question_Type.type_description;

            Categories = GetQuestions.GetCategories(question);

            Visibility = GetQuestions.getVisibleSelectList();
       }
}

还是应该放在其他地方？

欢迎链接到一些设计指南

Answer 1

我会使用第二个构造函数

public ShowQuestionViewModel(MvcApplication3.Models.Question dbmodel)

MvcApplication3.Models命名空间应该包含视图模型而不包含任何其他内容。我建议您将所有业务逻辑转移到类库中。

您也不必处理映射。您可以使用AutoMapper或ValueInjecter等框架。

我应该在哪里放置映射我的ViewModel的方法？

1 个答案: