C#树型select菜单

using System;
using System.Data;
using System.Text;

using BTCMS.IDAL;
using BTCMS.Utility;
using BTCMS.DALFactory;
namespace BTCMS.BLL
{
    /// <summary>
    /// 业务逻辑类Sort 的摘要说明。
    /// </summary>
    public class Sort
    {
        private static readonly ISort dal = DataAccess.CreateSort();

        public DataTable GetStortTree()
        {
            //创建返回的表
            DataTable dtTree = new DataTable();
            dtTree.Columns.Add("SID", typeof(int));
            dtTree.Columns.Add("SortStr", typeof(string));
            DataRow drDefalut = dtTree.NewRow();
            drDefalut["SID"] = 0;
            drDefalut["SortStr"] = "---根栏目---";
            dtTree.Rows.Add(drDefalut);
            //获取栏目表
            DataTable dtAll= dal.GetAllList("SID,NameCN,FatherID,ChildsCount,Route");
            int rowAllCount = dtAll.Rows.Count;
            if(rowAllCount == 0)
            {
                return dtTree;
            }
            //将栏目放如数组
            string[,] a = new string[rowAllCount,4];
            for(int i=0;i<rowAllCount;i++)
            {
                DataRow dr=dtAll.Rows[i];
                a[i,0]=dr["SID"].ToString();
                a[i,1]=dr["FatherID"].ToString();
                a[i,2]=dr["NameCN"].ToString();
                a[i,3]=dr["ChildsCount"].ToString();
            }
            //获取根栏目数量，进入第一次循环
            DataTable dtRoot = dal.GetRootList("SID");
            dtTree = GetChildsTree(a,dtTree,0,0,dtRoot.Rows.Count);

            return dtTree;
        }
        //GetStortTree子函数用于递归
        private DataTable GetChildsTree(string[,] ar, DataTable dtTree, int fatherid,int depth,int childCount)
        {
            int added = 0;
            for(int i=0;i<ar.Length/4;i++)
            {
                if(Convert.ToInt32(ar[i,1]) == fatherid)
                {
                    added += 1;
                    string strcur = " ";

                    if(fatherid !=0)
                    {
                        if (depth!=1)
                        {
                            strcur = strcur+"│";
                        }

                        if(childCount == added)
                            strcur = strcur+"└";
                        else
                            strcur = strcur+"├";
                    }

                    DataRow dr = dtTree.NewRow();
                    dr["SID"] = ar[i,0];
                    if(fatherid == 0)
                        dr["SortStr"] = strcur+"○"+ar[i,2]+"";
                    else
                        dr["SortStr"] = strcur+ar[i,2];
                    dtTree.Rows.Add(dr);
                    if(Convert.ToInt32(ar[i,3])>0)
                    {
                        dtTree=GetChildsTree(ar,dtTree,Convert.ToInt32(ar[i,0]),depth+1,Convert.ToInt32(ar[i,3]));
                    }
                }
            }
            
            return dtTree;
        }
   }
}

这里把记录放到数组里递归的,有点脱了裤子放屁的味道,DATATABLE不直接就是在内存里的了么.空了修改下.

最后是返回DATATABEL直接绑定到list控件上就可以了.之所以返回datatable是因为如果我要绑定到表格的话只要便利一次datatable替换下字符串就可以了.

数据库的这几个字段是必须的。FatherID上级栏目的ID，OrderID排序的编号，ChildCount子栏目数量。

效果http://www.blueidea.com/bbs/NewsDetail.asp?lp=2&id=2548181