列出 C# 中 TreeView 中父节点的所有子节点

Question

TreeView:

Expected Result:

Hi, I have a problem regarding to the tree view. I was trying to have a list of output like above picture but Im not really know how to do it. Im really appreaciate for your help, tq.

Answer 1

what I can suggest you to do is to iterate the treeview add nodes operation using a for and foreach loops to programmatically add nodes.

So, assuming the second image you are showing is the text inserted inside a richtextbox control, you can get the text line by line, and using the number that comes before the string as a reference to insert it into the treeview below the right node as child node or as main node.

So the code should be (based on the second image):

private void Add_Button_Click(object sender, EventArgs e)
{
    FillTreeView();
}

private void FillTreeView()
{
    Color previousColor;

    string NumBeforeScore = "";
    string NumAfterScore = "";

    String singleLine = String.Empty; // string to store a single line
    string[] RTBlines = RichTextBox.Lines; // get all lines of the richtextbox
    for (int i = 0; i < RTBlines.Length; i++)
    {
        string tempString = RTBlines[i]; // string to temporarily store our line

        if (char.IsNumber(tempString[0]) == true && char.IsPunctuation(tempString[1]) == true) // check if first character is a number and the second one is a punctuation
        {
            singleLine = tempString; // get the line using the indicated index (here the index is the 'i' integer)

            // Example: 2.3 Test (this is our string), now we are going to split this string in two pieces one with the number and one with the text using the space between the two values
            string stringNumber = singleLine.Split(' ')[0]; // this returns the number '2.3'
            string stringName = singleLine.Split(' ')[1]; // this returns the text 'Test'

            // same as before but we are splitting the number using the score,
            // because we know that before the point there is always a number but not always after the point there can be a number
            if (stringNumber != String.Empty && stringNumber.Contains(".") == true)
            {
                NumBeforeScore = stringNumber.Split('.')[0];
                NumAfterScore = stringNumber.Split('.')[1];
            }
            else
            {
                MessageBox.Show("String do not contains numbers or wrong format, make sure the numbers in the list contains a score (.) separator.", "Error");
            }

            if (NumAfterScore != String.Empty && char.IsNumber(NumAfterScore[0]) == true) // check if the second number after separator contains numbers
            {
                if (TreeView.Nodes.Count > 0) // check if treeview already contains any root node
                {
                    foreach (TreeNode node in TreeView.Nodes) // get the root nodes of the treeview
                    {
                        if (node.Text.Contains(NumBeforeScore + ". ") == true) // check if root node contains the number before the score of the line we are adding
                        {
                            if (node.Nodes.Count > 0)
                            {
                                foreach (TreeNode childnode in node.Nodes)
                                {
                                    if (childnode.Text != singleLine)
                                    {
                                        TreeView.BeginUpdate();
                                        node.Nodes.Add(new TreeNode(singleLine)); //finally adding to the root node our child node from the line of the richtextbox
                                        TreeView.Refresh();
                                        TreeView.EndUpdate();
                                        node.Expand();
                                    }
                                    else
                                    {
                                        TreeView.SelectedNode = childnode;
                                        previousColor = TreeView.SelectedNode.BackColor;
                                        TreeView.SelectedNode.BackColor = Color.Red;
                                        MessageBox.Show("The node you are trying to add already exists.");
                                        TreeView.SelectedNode.BackColor = previousColor;
                                        TreeView.SelectedNode = null;
                                    }
                                }
                            }
                            else
                            {
                                TreeView.BeginUpdate();
                                node.Nodes.Add(new TreeNode(singleLine)); //finally adding to the root node our child node from the line of the richtextbox
                                TreeView.Refresh();
                                TreeView.EndUpdate();
                                node.Expand();
                            }
                        }
                    }
                }
                else // and if not contains root nodes
                {
                    MessageBox.Show("No root nodes found inside the treeview, check the list and add a root node");
                }
            }
            else // and if not containing numbers
            {
                if (TreeView.Nodes.Count > 0)
                {
                    foreach (TreeNode node in TreeView.Nodes) // get the root nodes of the treeview
                    {
                        if (node.Text != singleLine && node.Text.Contains(NumBeforeScore + ". ") == false) // check if root node contains the number before the score of the line we are adding
                        {
                            TreeView.BeginUpdate();
                            TreeView.Nodes.Add(new TreeNode(singleLine)); // adding the text of the line as a new root node
                            TreeView.Refresh();
                            TreeView.EndUpdate();
                        }
                        else
                        {
                            TreeView.SelectedNode = node;
                            previousColor = TreeView.SelectedNode.BackColor;
                            TreeView.SelectedNode.BackColor = Color.Red;
                            MessageBox.Show("The node you are trying to add already exists.");
                            TreeView.SelectedNode.BackColor = previousColor;
                            TreeView.SelectedNode = null;
                        }
                    }
                }
                else
                {
                    TreeView.BeginUpdate();
                    TreeView.Nodes.Add(new TreeNode(singleLine)); // adding the text of the line as a new root node
                    TreeView.Refresh();
                    TreeView.EndUpdate();
                }
            }
        }
    }
}

So if you enter the values in the richtextbox as shown in the example of the second image, you will get the desired arrangement in the first image.

The only requirement is to indicate the root nodes eg: '1. rootnode' and child nodes eg:'1.1 childnode'. I wrote the example so that any string that comes out of this pattern is not considered, given the text in the image you provided, it also contained some extraneous text 'Activity List:'.

I leave you a link to the zip file containing the WinForm project with the source code if you want to give it a try before integrating it to yours.

Project link: TreeView_Test

I hope I've been of help, let me know if you need clarification. :-)

Answer 2

Not sure which direction you're going. I interpreted this as going from the TreeView to something else (TextBox maybe?).

If so, this could be as simple as:

private void button1_Click(object sender, EventArgs e)
{
    List<String> output = new List<string>();
    output.Add("Activity List:");
    foreach(TreeNode tn in treeView1.Nodes)
    {
        if (tn.Nodes.Count == 0)
        {
            output.Add(tn.Text);
        }
        else
        {
            foreach(TreeNode child in tn.Nodes)
            {
                output.Add(child.Text);
            }
        }
    }
    textBox1.Lines = output.ToArray();
}

Output: