TreeBuilder科学的树创建器

public static class TreeBuilder

    {

        public static List<dynamic> Build(IEnumerable<dynamic> collection, Func<dynamic, int, dynamic> parser, Func<dynamic, bool> rootSelector, Func<dynamic, dynamic, int, bool> childrenSelector)

        {

            if (collection != null && parser != null && rootSelector != null && childrenSelector != null)

            {

                var roots = collection.Where(rootSelector).Select(item => parser(item, )).ToList();

                roots.ForEach(node => { BuildChildren(collection, node, parser, , childrenSelector); });

                return roots;

            }

            return null;

        }

        private static void BuildChildren(IEnumerable<dynamic> collection, dynamic parent, Func<dynamic, int, dynamic> parser, int level, Func<dynamic, dynamic, int, bool> childrenSelector)

        {

            var children = collection.Where(t => childrenSelector(t, parent, level)).Select(item => parser(item, level)).ToList();

            if (children != null && children.Count > )

            {

                parent.state="closed";

                parent.children=children;

                children.ForEach(node => { BuildChildren(collection, node, parser, level + , childrenSelector); });

            }

        }

    }

string sql = @"SELECT  [Id]

      ,[PId]

      ,[Name]

      ,[OfficeTel]

      ,[Fax]

      ,[SafeTel]

      ,[MSTel]

      ,[ElectricTel]

      ,[Order]

      ,[Type]

  FROM [NEMS].[dbo].[ContactInfo] where [type]=@type order by [Order] ";

           BatchDataHelper helper = new BatchDataHelper("NEMSConnString");

           var list = helper.Query(sql, new List<KeyValuePair<string, object>>() { new KeyValuePair<string, object>("type", type) });

           var tree = TreeBuilder.Build(list, (d, i) =>

           {

               d.Level = i;

               return d;

           }, d => d.PId == , (d, n, i) => n.Id == d.PId);