List遍历删除 或取指定的前N项

     class Program
     {
         static void Main(string[] args)
         {
             /*
              * List遍历删除 或取指定的前N项
             */
             List<PerSon> listPer = CreateListPer();

             // 1、输出项
             Console.WriteLine("输出listPer项");
             foreach (PerSon per in listPer)
             {
                 Console.WriteLine("Id:" + per.Id + " Name:" + per.name);
             }

             //2、删除15条之后的数据
             //遍历删除索引大于50的项
             //将listPer的项复制到listPerTemp里面 如果直接用“=”的话，listPerTemp删除索引大于15的项，listPer大于15的项也会删掉
             List<PerSon> listPerTemp = new List<PerSon>(listPer.ToArray());
             //这将复制listPer中的所有项目到listPerTemp
             //listPer.ForEach（i => listPerTemp.Add（i）);
             listPer.ForEach(i => listPerTemp.Add(i));
             for (int i = listPerTemp.Count - ; i >= ; i--)
             {
                 if (i >= )
                 {
                     listPerTemp.RemoveAt(i);
                 }
             }
             Console.Write("\n");
             // 3、输出项
             Console.WriteLine("输出listPerTemp项");
             foreach (PerSon per in listPerTemp)
             {
                 Console.WriteLine("Id:" + per.Id + " Name:" + per.name);
             }

             //
             Console.Write("\n");
             Console.WriteLine("输出listPer项");
             foreach (PerSon per in listPer)
             {
                 Console.WriteLine("Id:" + per.Id + " Name:" + per.name);
             }

             Console.Write("\n");
             //除了用移除的方法获取索引小于15的项，还可以用.take(15);
             var result = from r in listPer
                          select r;

             result = result.Take();
             foreach (var c in result)
             {
                 Console.WriteLine("Id:" + c.Id + " Name:" + c.name);
             }

             Console.Write("\n");
            //或者直接take
             listPer = listPer.Take().ToList();
             foreach (PerSon per in listPer)
             {
                 Console.WriteLine("Id:" + per.Id + " Name:" + per.name);
             }
             Console.ReadKey();
         }

         private static List<PerSon> CreateListPer()
         {
             List<PerSon> listper = new List<PerSon>();
             PerSon per = new PerSon();
             for (int i = ; i <= ; i++)
             {
                 per = new PerSon();
                 per.Id = i;
                 per.name = "N-" + i;
                 listper.Add(per);
             }

             return listper;
         }
     }

     public class PerSon
     {
         /// <summary>
         /// 编号
         /// </summary>
         public int Id { get; set; }

         /// <summary>
         /// 名称
         /// </summary>
         public string name { get; set; }
     }