Question

我有一个具有多对多关系的两个实体的模型。我还需要存储有关连接的额外信息，因此我使用了自定义连接安排。该模型如下 -

疾病模型

public class Disease
{
    [Key]
    [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
    public Int32 DiseaseID { get; set; }

    [Required]
    [Display(Name = "Disease")]
    [StringLength(100)]
    public string DiseaseName { get; set; }

    public virtual ICollection<App.Models.Medicine.MedicineToDisease> MedicineToDisease { get; set; }       
}

医学模型

public class Medicine
{
    [Key]
    [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
    public Int32 MedicineID { get; set; }

    [Required]
    [StringLength(100)]
    [Display(Name = "Generic Name")]
    public string Medicine_Generic_Name { get; set; }

    public virtual ICollection<App.Models.Medicine.MedicineToDisease> MedicineToDisease { get; set; }

加入表格

public class MedicineToDisease
{
    public int MedicineToDiseaseId { get; set; }

    public int MedicineId { get; set; }
    public virtual Medicine Medicine { get; set; }

    public int DiseaseId { get; set; }
    public virtual Disease.Disease Disease { get; set; }

    -- Other Information Fields related to the join --
}

我创建了一个列表视图模型，显示了所有药物的列表。我想显示上面连接表中有任何信息的所有疾病的 DISTINCT 列表。这是目前为止的ViewModel -

public class MedicineListViewModel
    {
        public Int32 MedicineID { get; set; }
        public string MedicineName { get; set; }
        public string AssociatedDiseases { get; set; }
    }

查询信息的控制器代码如下 -

    public ActionResult Index()
    {
        try
        {
            var model = db.Medicine.Select(u => new MedicineListViewModel
            {
                MedicineID = u.MedicineID,
                MedicineName = u.Medicine_Generic_Name + " (" + u.Medicine_Trade_Name + ")",
                NoOfTimesFree = u.Medicine_TimesFree,
                AssociatedDiseases = db.MedicineToDisease.Where(m=>m.MedicineId == u.MedicineID).Select(s => s.Disease.DiseaseName).Distinct().ToList().ToString() 
            }).ToList();
            return View(model);
        }
        catch (Exception ex)
        {
            TempData["ErrorMsg"] = ex.Message.ToString();
        }
        return null;
    }

请建议。感谢。

在ASP.NET MVC中显示表中相关实体的名称

0 个答案: