[新闻系统]二级分类 仿动网新闻效果

写新闻的时候不可避免的要写到分类的管理

笔者一时间陷入几级分类的痛苦中看过CS之后才发现原来CS那么大的系统也不过三级而已
自己写的是一个二级把两个都贴出来 和大家一起分享,采用遍历的方法按层级的顺序访问

 1        public static string BuildTreeByColumnID(int id)
 2        {
 3            Provider dp = Provider.Instance();
 4
 5            Column column = GetColumnByID(id);
 6            int depth = column.Depth;
 7            int sort = column.Sort;
 8            if(depth == 0)
 9            {
10                if (dp.GetChildColumns(id).Count > 0)
11                {
12                    return "images/admin_tree_plusmiddle.gif" + "&" + "images/admin_tree_folder.gif" + "&" + column.Name;                    
13                }
14                else
15                {
16                    if (!ISLastONE(id))
17                        return "images/admin_tree_minusmiddle.gif" + "&" + "images/admin_tree_folder.gif" + "&" + column.Name;
18                    else return "images/admin_tree_minusbottom.gif" + "&" + "images/admin_tree_folder.gif" + "&" + column.Name;
19                }
20            }
21            else if(depth == 1)
22            {
23                if (dp.GetChildColumns(id).Count > 0)
24                {                    
25                        return "images/admin_tree_line.gif" + "&" + "images/admin_tree_plusmiddle.gif" + "&" + "images/admin_tree_folder.gif" + "&" + column.Name;
26        
27                }
28                else
29                {
30                    if (!ISLastONE(id))
31                        return "images/admin_tree_line.gif" + "&" + "images/admin_tree_minusmiddle.gif" + "&" + "images/admin_tree_folder.gif" + "&" + column.Name;
32                    else return "images/admin_tree_line.gif" + "&" + "images/admin_tree_minusbottom.gif" + "&" + "images/admin_tree_folder.gif" + "&" + column.Name;
33                }
34            }
35            else return null;
36        }

public static bool ISLastONE(int id)
        {
            Provider dp = Provider.Instance();

            ColumnCollection columns = GetSortColumns();
            for (int i = 0; i < columns.Count; i++)
            {
                if (id == columns[i].ID)
                {
                    if (i + 1 < columns.Count)
                    {
                        if (columns[i + 1].Depth < columns[i].Depth)
                            return true;
                    }
                    else return true;
                }
            }

            return false;        
        }

public static ColumnCollection GetSortColumns()
        {
            Provider dp = Provider.Instance(); 

            ColumnCollection columns = new ColumnCollection();
       
            int i = 0;// 临时索引
            Column column = new Column();
            for (i = 0; i < dp.GetColumnsByDepth(0).Count; i++)
            {
                column = dp.GetColumnsByDepth(0)[i];
                columns.Add(column);// 按索引添加数据
                // 添加子栏目并建立索引
                if (dp.GetChildColumns(column.ID) != null)
                {
                    for (int k = 0; k < dp.GetChildColumns(column.ID).Count; k++)
                    {
                        columns.Add(dp.GetChildColumns(column.ID)[k]);
                    }
                }            
            }

            return columns;
        }

上移, 下移

 public static void MoveSort(int id, int depth, Way way)
        {
            Provider dp = Provider.Instance();
            if (id != 0 && depth > -1)
            {
                dp.SortMove(id, depth, way);
            }
            else throw new Exception("参数不正确，请检查");
        }