记录转化为有层次结构的树状列表的通用算法

    public class CollectionHelper
    {            
        private static ArrayList Fill(int pID, int level, ArrayList list)
        {
            ArrayList returnList = new ArrayList();
            foreach(object obj in list)
            {
                int typePID = (int)ReflectionUtil.GetProperty(obj, "PID");
                int typeID = (int)ReflectionUtil.GetProperty(obj, "ID");
                string typeName = ReflectionUtil.GetProperty(obj, "Name") as string;

                if(pID == typePID)
                {
                    string newName = new string('-', level * 4) + typeName;
                    ReflectionUtil.SetProperty(obj, "Name", newName);
                    returnList.Add(obj);

                    returnList.AddRange(Fill(typeID, level+1, list));
                }
            }
            return returnList;
        }

        /// <summary>
        /// 生成有层次结构的列表
        /// </summary>
        /// <param name="list">具有Name,ID,PID成员的任何集合</param>
        /// <returns></returns>
        public static ArrayList GetTreeItems(ArrayList list)
        {
            return Fill(-1, 0, list);
        }    
    }

    public sealed class ReflectionUtil
    {
        private ReflectionUtil()
        { }

        public static BindingFlags bf = BindingFlags.DeclaredOnly | BindingFlags.Public |
            BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static;

        public static void SetProperty(object obj, string name, object value)
        {
            PropertyInfo fi = obj.GetType().GetProperty(name, bf);
            fi.SetValue(obj, value,null);
        }

        public static object GetProperty(object obj, string name)
        {
            PropertyInfo fi = obj.GetType().GetProperty(name, bf);
            return fi.GetValue(obj,null);
        }
}

效果图如下

本文转自博客园伍华聪的博客，原文链接：记录转化为有层次结构的树状列表的通用算法，如需转载请自行联系原博主。