How to edit treeview xml file and save in Winforms?

Question

I'm trying to make a XML Editor.
My Code wroks. I choose a file and it is shown to Application.
How to edit a node by double-clicking it and save it by pressing Crtl+S?
Thank you for your help!

    private void button1_Click(object sender, EventArgs e)  
    {  
        OpenFileDialog dlg = new OpenFileDialog();  
        dlg.Title = "Open XML Document";  
        dlg.Filter = "XML Files (*.xml)|*.xml";  

        if (dlg.ShowDialog() == DialogResult.OK)  
        {  
            try  
            {  
                this.Cursor = Cursors.WaitCursor;  

                XmlDocument xDoc = new XmlDocument();  
                xDoc.Load(dlg.FileName);  
                tvLabel.Nodes.Clear();  
                tvLabel.Nodes.Add(new TreeNode(xDoc.DocumentElement.Name));  
                TreeNode tNode = new TreeNode();  
                tNode = (TreeNode)tvLabel.Nodes[0];  

                addTreeNode(xDoc.DocumentElement, tNode);  

                tvLabel.ExpandAll();  
            }  
            catch (Exception ex)  
            {  
                MessageBox.Show(ex.Message);  
            }  
            finally  
            {  
                this.Cursor = Cursors.Default;  
            }  
        }  
    }  

    private void addTreeNode(XmlNode xmlNode, TreeNode treeNode)  
    {  
        XmlNode xNode;  
        TreeNode tNode;  
        XmlNodeList xNodeList;  

        if (xmlNode.HasChildNodes)  
        {  
            xNodeList = xmlNode.ChildNodes;  

            for (int x = 0; x <= xNodeList.Count - 1; x++)  
            {  
                xNode = xmlNode.ChildNodes[x];  
                treeNode.Nodes.Add(new TreeNode(xNode.Name));  
                tNode = treeNode.Nodes[x];  
                addTreeNode(xNode, tNode);  
            }  
        }  
        else  
            treeNode.Text = xmlNode.OuterXml.Trim();  
    }  

Answer 1

@LooBi ，Welcome to Microsoft Q&A, you could override ProcessCmdKey method and use NodeMouseDoubleClick event to get what you wanted.
Here is a code example you could refer to.

Code:

 public string FileName { get; set; }      
            private void button1_Click(object sender, EventArgs e)  
            {  
                OpenFileDialog dlg = new OpenFileDialog();  
                dlg.Title = "Open XML Document";  
                dlg.Filter = "XML Files (*.xml)|*.xml";  
                if (dlg.ShowDialog() == DialogResult.OK)  
                {  
                    try  
                    {   
                        FileName = dlg.FileName;  
                        this.Cursor = Cursors.WaitCursor;  
                        XmlDocument xDoc = new XmlDocument();  
                        xDoc.Load(dlg.FileName);  
                        tvLabel.Nodes.Clear();  
                        tvLabel.Nodes.Add(new TreeNode(xDoc.DocumentElement.Name));  
                        TreeNode tNode = new TreeNode();  
                        tNode = (TreeNode)tvLabel.Nodes[0];  
                        addTreeNode(xDoc.DocumentElement, tNode);  
                        tvLabel.ExpandAll();  
                    }  
                    catch (Exception ex)  
                    {  
                        MessageBox.Show(ex.Message);  
                    }  
                    finally  
                    {  
                        this.Cursor = Cursors.Default;  
                    }  
                }  
            }  
      
            private void addTreeNode(XmlNode xmlNode, TreeNode treeNode)  
            {  
                XmlNode xNode;  
                TreeNode tNode;  
                XmlNodeList xNodeList;  
                if (xmlNode.HasChildNodes)  
                {  
                    xNodeList = xmlNode.ChildNodes;  
                    for (int x = 0; x <= xNodeList.Count - 1; x++)  
                    {  
                        xNode = xmlNode.ChildNodes[x];  
                        treeNode.Nodes.Add(new TreeNode(xNode.Name));  
                        tNode = treeNode.Nodes[x];  
                        addTreeNode(xNode, tNode);  
                    }  
                }  
                else  
                    treeNode.Text = xmlNode.OuterXml.Trim();  
            }  
      
            private void tvLabel_NodeMouseDoubleClick(object sender, TreeNodeMouseClickEventArgs e)  
            {  
                tvLabel.LabelEdit = true;  
                tvLabel.SelectedNode.BeginEdit();  
         
              
            }  
      
            protected override bool ProcessCmdKey(ref Message msg, Keys keyData)  
            {  
                if (keyData == (Keys.Control | Keys.S))  
                {  
                    exportToXml(tvLabel, FileName);  
                    return true;  
                }  
                return base.ProcessCmdKey(ref msg, keyData);      
            }  
            StreamWriter sr = null;  
            public void exportToXml(TreeView tv, string filename)  
            {  
                sr = new StreamWriter(filename, false, System.Text.Encoding.UTF8);  
                sr.WriteLine("<" + tv.Nodes[0].Text + ">");  
                foreach (TreeNode node in tv.Nodes)  
                {  
                    saveNode(node.Nodes);  
                }  
                //Close the root node  
                sr.WriteLine("</" + tv.Nodes[0].Text + ">");  
                sr.Close();  
            }  
            private void saveNode(TreeNodeCollection tnc)  
            {  
                foreach (TreeNode node in tnc)  
                {  
      
                    if (node.Nodes.Count > 0)  
                    {  
                        sr.Write("<" + node.Text + ">");  
                        saveNode(node.Nodes);  
                        sr.WriteLine("</" + node.Text + ">");  
                    }  
                    else  
                        sr.Write(node.Text);  
                }  
            }  

Best Regards,
Jack

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