C#中TreeView实现适合两级节点的选中节点方法

本文实例讲述了c#中treeview实现适合两级节点的选中节点方法。分享给大家供大家参考。具体如下：

class treeviewchecked
{
  bool isfirst = true;
  public treeviewchecked(treeview treeview)
  {
   treeview.aftercheck += new treevieweventhandler(treeview_aftercheck);
   treeview.afterselect += new treevieweventhandler(treeview_afterselect);
  }
  /// <summary>
  /// 点击文字，选中checkbox
  /// </summary>
  /// <param name="sender"></param>
  /// <param name="e"></param>
  void treeview_afterselect(object sender, treevieweventargs e)
  {
   if (e.node.checked)
    e.node.checked = false;
   else
    e.node.checked = true;
   if (isfirst)
   {
    isfirst = false;
    e.node.treeview.nodes[0].checked = false;
   }
  }
  /// <summary>
  /// 选中子节点，勾选父节点，选中父节点，勾选子节点
  /// </summary>
  /// <param name="sender"></param>
  /// <param name="e"></param>
  void treeview_aftercheck(object sender, treevieweventargs e)
  {
   checktreenode(e.node);
  }
  /// <summary>
  /// 选中子节点，勾选父节点，选中父节点，勾选子节点
  /// </summary>
  /// <param name="node"></param>
  private void checktreenode(treenode node)
  {
   node.treeview.aftercheck -= new treevieweventhandler(treeview_aftercheck);
   //如果不等于null,说明选择的是子节点
   if (node.parent != null)
   {
    treenode parent = node.parent as treenode;
    //如果该节点是选中的
    if (node.checked)
    {
     //判断其父节点是否被选中，如果没有被选中则选中它
     if (parent.checked == false)
     {
      parent.checked = true;
     }
    }
    else
    {
     bool ischecked = false;
     foreach (treenode child in parent.nodes)
     {
      if (child.checked)
      {
       ischecked = true;
       break;
      }
     }
     if (ischecked)
      parent.checked = true;
     else
      parent.checked = false;
    }
   }//如果等于null，说明选择的是根节点
   else
   {
    foreach (treenode child in node.nodes)
    {
     child.checked = node.checked;
    }
   }
   node.treeview.aftercheck += new treevieweventhandler(treeview_aftercheck);
  }
}

希望本文所述对大家的c#程序设计有所帮助。