数据结构~在页面上渲染树型结构

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标准树的代码

  1: class Tree  

  2:         {       

  3:             static Data.test.ICategoriesRepository iCategoriesRepository = new Data.test.CategoriesRepository(); 

  4:             /// <summary>

  5:             /// 树形数据对象列表   

  6:             /// </summary>

  7:              static List<Entity.test.Category> list = null;       

  8:            /// <summary>    

  9:            /// 获取当前树形数据对象列表   

 10:            /// </summary>   

 11:             internal static List<Entity.test.Category> ProductVirtualCategoryList 

 12:             {

 13:                 get { return list; }

 14:             }     

 15:             static Tree() 

 16:             {

 17:                 Reload();

 18:             }

 19:             /// <summary> 

 20:             /// 重新加载分类树型列表     

 21:             /// </summary>

 22:            internal static void Reload()  

 23:            {

 24:                list = iCategoriesRepository.GetCategories().ToList();   

 25:            }    

 26:             /// <summary>    

 27:             ///  根据父对象，找到子孙树，通过递归所到所有子对象，并把对象赋给参数father   

 28:             ///  </summary>   

 29:             ///  <param name="father">父对象</param>    

 30:             static internal void GetSublCategories(Entity.test.Category father)   

 31:             {      

 32:                 father.SubCategoryies = list.Where(item => item.ParentId.Equals(father.Id)).ToList();   

 33:                 father.SubCategoryies.ForEach(item =>  {item.FatherCategory = father;  

 34:                     GetSublCategories(item);   

 35:                 });    

 36:             }   

 37:         }

 树的组装，与前台HTML的拼接

  1:    #region 树的遍历（递归思想）  

  2:     Entity.test.Category list = new Entity.test.Category { Id = 1 };   

  3:     Tree.GetSublCategories(list);//为list填充子树        

  4:     StringBuilder html = new StringBuilder();  

  5:     html.Append("<ul>");  

  6:     GetSubCategory(html, list); 

  7:     html.Append("</ul>");    

  8:     #endregion    

  9:     Console.WriteLine(html);

树的显示时用到的递归方法

 

  1: /// <summary>

  2: /// 通过递归拼树形结构

  3: /// </summary>

  4: /// <param name="html"></param>

  5: /// <param name="category"></param>

  6: private static void GetSubCategory(StringBuilder html, Entity.test.Category category)   

  7:    {       

  8:     html.Append("<li>");    

  9:     html.Append("<input type='hidden' value='" + category.Id + "' />");     

 10:     html.Append("<a href='#' name='" + category.Name + "'>");    

 11:     html.Append("<ins>&nbsp;</ins>");       

 12:     html.Append(category.Id + "-" + category.Name + "(" + category.Level + ")");    

 13:     html.Append("</a>");      

 14:     if (category.SubCategoryies != null && category.SubCategoryies.Count > 0)        

 15:      {         

 16:     html.Append("<ul>");    

 17:     foreach (var item in category.SubCategoryies)     

 18:      {       

 19:        GetSubCategory(html, item);     

 20:      }            

 21:     html.Append("</ul>"); 

 22:    }        

 23:     html.Append("</li>"); 

 24:   }

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