Lambda开启新的编写方式

      出于对Lambda的好奇所以学习了一下，看能不能通过Lambda来开启新的更用效的代码编写方式。以下是通过Lambda实现一个通用型的递归控制处理函数。这只是一个参考，实际上你可以挖掘Lambda更多的使用方法.多谢 装配脑袋  指出问题重新调整一下代码(这里本意不是描述该方法功能如何,而是想体现Lambda的引发的虽一种编码方式).

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
namespace lambdaTest
{
    public delegate void EventExecute<T>(T source, Program.Recursive<T> next);
    public static class Program
    {
        static void Main(string[] args)
        {

            UnderList ul = new UnderList();
            ul.EmployeeID = 2;
            string sql = "select EmployeeID,FirstName from Employees where ReportsTo={0}";
            using (System.Data.SqlClient.SqlConnection conn
                = new System.Data.SqlClient.SqlConnection("Data Source=.;Initial Catalog=Northwind;Integrated Security=True"))
            {
                conn.Open();
                Do<UnderList>(ul, p => (p.EmployeeID > 0),
                   delegate(UnderList source, Program.Recursive<UnderList> r)
                   {
                       source.Format += "\t";
                       List<int> mUnders = new List<int>();
                       SqlCommand cmd = conn.CreateCommand();
                       cmd.CommandText = string.Format(sql, source.EmployeeID);
                       using (SqlDataReader reader = cmd.ExecuteReader())
                       {
                           while (reader.Read())
                           {
                               mUnders.Add((int)reader[0]);
                               Console.WriteLine(source.Format + reader[1]);

                           }

                       }
                       source.EmployeeID = 0;
                       foreach (int item in mUnders)
                       {
                           source.EmployeeID = item;
                           r.Do();

                       }
                   }
                );
            }
     
           Console.Read();
            
            
         }
        private static void Do<T>(T i, Func<T, bool> a, EventExecute<T> e)
        {

            Program.Recursive<T> rec = new Recursive<T>(i,e,a);
            e(i, rec);
            
        }
        public class Recursive<T>
        {
            public Recursive(T source, EventExecute<T> e, Func<T, bool> expression)
            {
                Source = source;
                E = e;
                Expression = expression;
            }
            private T Source;
            private EventExecute<T> E;
            Func<T, bool> Expression;
            
            public void Do()
            {
                if (Expression(Source))
                    E(Source, this);
            }
            
           

        }
    }
    public class UnderList
    {
        private int mEmployeeID;
        public int EmployeeID
        {
            get
            {
                return mEmployeeID;
            }
            set
            {
                mEmployeeID = value;
            }
        }
        public string Format = "";
        
        

    }
}