关于地址添加 子窗体向父窗体传值 树的使用详细

namespace ItcastSIMS{    public partial class FrmArea : Form    {        public FrmArea()        {            InitializeComponent();        }        AreaBLL bll = new AreaBLL();        List<Areas> list;//数据库地址信息        private void FrmArea_Load(object sender, EventArgs e)        {            list = bll.GetAllAreas();            tvAreas.Nodes.Clear();//默认节点清空            CreateParent();        }        private void CreateParent()        {            TreeNode parent = new TreeNode();            parent.Text = "全国";            parent.Tag = 0;            tvAreas.Nodes.Add(parent);//添加父节点            //添加子节点            CreateChild(parent);            //展开            //tvAreas.ExpandAll();            parent.Expand();        }                private void CreateChild(TreeNode parent)        {            //父节点的id            int pid = Convert.ToInt32(parent.Tag);            foreach (Areas a in list)            {                if (a.APid == pid)                {                    TreeNode tn = new TreeNode();                    tn.Text = a.AName;                    tn.Tag = a.AID;                    parent.Nodes.Add(tn);                    //递归调用，加载子节点                    CreateChild(tn);                }            }        }        private void btnSure_Click(object sender, EventArgs e)        {            //获取选中的节点            GetTNText(tvAreas.SelectedNode);            txt += tvAreas.SelectedNode.Text;            DialogResult = System.Windows.Forms.DialogResult.OK;        }        public string txt = "";        /// <summary>        /// 获取选中节点的父节点的内容        /// </summary>        /// <param name="tn"></param>        /// <returns></returns>        void GetTNText(TreeNode tn)        {            if (tn.Parent != null)            {                GetTNText(tn.Parent);                txt += tn.Parent.Text + "-";            }        }    }

}

 

 

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 //选择地区        private void btnChooseArea_Click(object sender, EventArgs e)        {            FrmArea frm = new FrmArea();            if (frm.ShowDialog() == System.Windows.Forms.DialogResult.OK)            {                txtArea.Text = frm.txt;            }        }

转载于:https://www.cnblogs.com/eric-gms/p/3453513.html