1 public partial class Form1 : Form 2     { 3         List
     
       Chlist = new List
      
       (); 4         public Form1() 5         { 6             InitializeComponent(); 7             Chlist = new ChinaData().Select(); 8             TreeNode tn1 = new TreeNode("中国"); 9             tn1.Tag = "0001";10             NodesBind(tn1);11             treeView1.Nodes.Add(tn1);12         }13         public void NodesBind(TreeNode tn)14         {15             //lambda 表达式16             List
       
         clist = Chlist.Where(a=>a.ParentAreaCode==tn.Tag.ToString()).ToList();17             foreach (China c in clist)18             {19                 TreeNode tnn = new TreeNode(c.AreaName);20                 tnn.Tag =c.AreaCode;21                 NodesBind(tnn);//递归22                 tn.Nodes.Add(tnn);23             }24          }25     }