treeview里的Addrange()问题,添加节点后treeview里显示不出
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace WindowsApplication1
{
public partial class Form1 : Form
{
TreeView ptv = new TreeView();
public Form1()
{
InitializeComponent();
ptv.Nodes.Add("polygon");
ptv.Nodes.Add("circle");
ptv.Nodes.Add("envelope");
}
private void button1_Click(object sender, EventArgs e)
{
TreeNode []allnode=new TreeNode [ptv .Nodes .Count];
ptv.Nodes.CopyTo(allnode, 0);
treeView1.Nodes.AddRange(allnode);
MessageBox.Show(treeView1 .Nodes .Count .ToString ());//通过这个也验证了里面有三个节点
//treeView1.Update();
}
}
}
代码如上,我用treeview1.nodes.addrange()方法加含有三个节点的的treenode数组allnode,但明明加进去了,messagebox也显示为3,但就是treeview1里显示不出来!!该怎么办呢???初学者求大家帮帮忙啊!纠结死了....