LINQ能否直接类型转换
以下问题，下述写法需要建立一个lll序列逐步便利，能否让
var NewList = from p in BigList select new Small { id = p.id };直接转换为List<int>
即：List<int> NewList = from p in BigList select new { id = p.id };，但是这么写不好用

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace Web
{
  class Article
  {
  public int? id;
  public string nr;
  }

  public partial class Test : System.Web.UI.Page
  {
  protected void Page_Load(object sender, EventArgs e)
  {
  if (!IsPostBack)
  {
  List<Article> ArticleList = new List<Article>();
  ArticleList.Add(new Article { id = 1, nr = "11" });
  ArticleList.Add(new Article { id = 2, nr = "22" });
  ArticleList.Add(new Article { id = 3, nr = "33" });
  ArticleList.Add(new Article { id = 4, nr = "44" });
  ArticleList.Add(new Article { id = 5, nr = "55" });

  //NewList是对ArticleList的加工
  var NewList = from p in ArticleList where p.id<=3 select new { id = p.id };
  
  List<int> lll = new List<int>();
  foreach (var p in NewList)
  {
  lll.Add(Convert.ToInt32(p.id));
  }
  //问题：上述写法需要建立一个lll序列逐步便利，能否让
  //var NewList = from p in BigList select new Small { id = p.id };直接转换为List<int>
  //即：List<int> NewList = from p in BigList select new { id = p.id };，但是这么写不好用
  }
  }
  }
}

------解决方案--------------------
List<int> lll = NewList.Select(p => p.id).ToList();
------解决方案--------------------
List<int> lll = NewList.Select(p => p.id).Where(p => p.HasValue).Select(p=>p.Value).ToList();
------解决方案--------------------
List<int> lll = NewList.Select(p => (int)p.id).ToList();
------解决方案--------------------
直接类型转换
List<int> list= NewList.Select(p => Convert.ToInt32(p.id)).ToList();