我无法在 Treeview 中添加 Treenode

Question

我想通过子表单向父表单添加一个树节点但是它没有出现在树视图中

我还添加了 treeview imageIndex

请告诉我如何添加树节点

// [childform]
private void button1_Click(object sender, EventArgs e)
{
   main _main = new main();
   _main.SetFtpClient();
}

//[MainForm]
private void toolStripButton1_Click(object sender, EventArgs e)
{
   _ConnectForm.StartPosition = FormStartPosition.CenterParent;
   _ConnectForm.ShowDialog(this);
}

public void SetFtpClient()
{
   TreeNode svrNode = new TreeNode("server", 0, 0);
   svrNode.Nodes.Add("SE", "seoul", 0, 0);
   svrNode.Nodes.Add("DJ", "seoul1", 0, 0);
   svrNode.Nodes.Add("BS", "seoul2", 0, 0);

   TreeNode netNode = new TreeNode("network", 1, 1);
   netNode.Nodes.Add("T1", "Cable", 1, 1);
   netNode.Nodes.Add("56K", "Modem", 1, 1);
   netNode.Nodes.Add("3G", "Wireless", 1, 1);
   tv_ftp.Nodes.Add(svrNode);
   tv_ftp.Nodes.Add(netNode);
}

Answer 1

有很多方法可以做到这一点。一种方法是在您的子表单中引用您的主表单。在您的子表单构造函数中添加一个参数。假设子窗体的名称是 ConnectForm，主窗体是 MainForm.

using System;
using System.Windows.Forms;

namespace TreeViewDemo
{
    public partial class ConnectForm : Form
    {
        Form parent; // a reference of the main form

        public ConnectForm(Form form)
        {
            InitializeComponent();

            // set a reference of the main form
            parent = form;
        }

        void Button1Click(object sender, EventArgs e)
        {
            // you have to cast it to the MainForm first,
            // otherwise the method SetFtpClient is not accessible
            var _main = (MainForm) parent;
            _main.SetFtpClient();
        }
    }
}

然后使用参数化构造函数将主窗体传递到子窗体。

using System;
using System.Windows.Forms;

namespace TreeViewDemo
{
    public partial class MainForm : Form
    {
        public MainForm()
        {
            InitializeComponent();
        }

        void Button1Click(object sender, EventArgs e)
        {
            // create an instance of child form, and pass the main form into it
            var _ConnectForm = new ConnectForm(this);

            _ConnectForm.StartPosition = FormStartPosition.CenterParent;
            _ConnectForm.ShowDialog(this);
        }

        public void SetFtpClient()
        {
            TreeNode svrNode = new TreeNode("server", 0, 0);
            svrNode.Nodes.Add("SE", "seoul", 0, 0);
            svrNode.Nodes.Add("DJ", "seoul1", 0, 0);
            svrNode.Nodes.Add("BS", "seoul2", 0, 0);

            TreeNode netNode = new TreeNode("network", 1, 1);
            netNode.Nodes.Add("T1", "Cable", 1, 1);
            netNode.Nodes.Add("56K", "Modem", 1, 1);
            netNode.Nodes.Add("3G", "Wireless", 1, 1);
            tv_ftp.Nodes.Add(svrNode);
            tv_ftp.Nodes.Add(netNode);
        }
    }
}

我无法在 Treeview 中添加 Treenode

I can't add Treenode in Treeview

c#

winforms

treeview

treenode