DataSet递归构建树结构

2017-10-27 15:35:58  访问(2197) 赞(0) 踩(0)

通过DataSet创建树结构的DataTable

        /// <summary>
        /// 通过DataSet创建树结构的DataTable
        /// </summary>
        /// <param name="ds">数据集</param>
        /// <param name="pId">父节点|如："0"代表根节点</param>
        /// <param name="idFieldName">关键字字段名|如："ID"</param> 
        /// <param name="pidFieldName">父节点字段名|如："PID"</param>
        /// <returns>树结构的DataTable，p__Layer新增字段为层数</returns>
        public DataTable DataTableTreeCreate(DataSet ds, string pId, string idFieldName, string pidFieldName)
        {
            ds.Tables[0].Columns.Add(BmName.p__Layer, typeof(int));
            DataTable theResult = ds.Tables[0].Clone();

            DataTableTreeBuild(theResult, ds, pId, idFieldName, pidFieldName, 1);

            return theResult;
        }

        /// <summary>
        /// 通过DataSet组合构建树结构的DataTable
        /// </summary>
        /// <param name="theResult">要构建的数据表</param>
        /// <param name="ds">数据集</param>
        /// <param name="pId">父节点|如："0"代表根节点</param>
        /// <param name="idFieldName">关键字字段名|如："ID"</param> 
        /// <param name="pidFieldName">父节点字段名|如："PID"</param>
        /// <param name="iLayer">当前层数，从1开始|如：1</param>
        protected void DataTableTreeBuild(DataTable theResult, DataSet ds, string pId, string idFieldName,  string pidFieldName,int iLayer)
        {
            DataTable dt = ds.Tables[0];

            foreach (DataRow dr in dt.Rows)
            {
                if (dr[pidFieldName].ToString() != pId)
                    continue;

                dr[BmName.p__Layer] = iLayer;

                theResult.ImportRow(dr);

                DataTableTreeBuild(theResult, ds, dr[idFieldName].ToString(), idFieldName, pidFieldName, iLayer + 1);
            }
        }

BmName

using System;
using System.Collections.Generic;
using System.Text;

namespace eKing.BmLib.Names
{
    /// <summary>
    /// 
    /// </summary>
    public class BmName
    {
        /// <summary>
        /// 
        /// </summary>
        public BmName()
        {

        }

        /// <summary>
        /// p__Layer
        /// </summary>
        public const string p__Layer = "p__Layer";
    }
}

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