MVC 中 Razor 无限分类的展示

在MVC的Razor视图展示无级分类的办法，在网上看了很多资料，大多搞得很高大上。可能本人水平有限，实在是不会用。

那我就用最简单爆力的办法来做。

Model：

    public class NewsCategory
    {
        [Key]
        public int CategoryId { get; set; }
        public int ParentCategoryId { get; set; }
        [Required]
        [StringLength()]
        public string CategoryName { get; set; }
    }

ViewModel

    public class NewsCategoriesViewModel
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public List<NewsCategoriesViewModel> children { get; set; }
    }

Controller

递归获取数据，然后返回给视图

        abcContext db = newabcContext();
         public ActionResult Index()
         {
             var categoryList = GetCategoryList();
             return View(categoryList);
         }

         [NonAction]
         public List<NewsCategoriesViewModel> GetCategoryList(int Id)
         {
             List<NewsCategoriesViewModel> uvModel = new List<NewsCategoriesViewModel>();

             var perentList = db.Set<NewsCategory>().Where(p => p.ParentCategoryId == Id).ToList();

             if (perentList.Count > )
             {
                 foreach (var item in perentList)
                 {
                     NewsCategoriesViewModel userViewModel = new NewsCategoriesViewModel
                     {
                         Id = item.CategoryId,
                         Name = item.CategoryName,
                         children = new List<NewsCategoriesViewModel>()
                     };
                     List<NewsCategoriesViewModel> tempList = GetCategoryList(item.CategoryId);
                     if (tempList.Count > )
                     {
                         //这里出错了;
                         //userViewModel.children.Add(tempList);
                         userViewModel.children = tempList;
                     }
                     uvModel.Add(userViewModel);
                 }
             }
             return uvModel;
         }
     }

View

定义一个视图方法，然后递归调用。

@model List<NewsCategoriesViewModel>
@helper DisplayList(List<NewsCategoriesViewModel> model)
        {
            if (model.Count > )
            {
                <ul>
                    @foreach (var item in model)
                    {
                        <li>@item.Name</li>
                        if (item.children.Count > )
                        {
                            @DisplayList(item.children);
                        }
                    }
                </ul>

            }
        }
        @DisplayList(Model)

打完收功！