Accessing All the Nodes in Treeview Control

List all child nodes of a parent node in a treeview control in Visual C#

You can add to a list recursively like this:

public void AddChildren(List<TreeNode> Nodes, TreeNode Node)
{
foreach (TreeNode thisNode in Node.Nodes)
{
Nodes.Add(thisNode);
AddChildren(Nodes, thisNode);
}
}

Then call this routine passing in the root node:

List<TreeNode> Nodes = new List<TreeNode>();
AddChildren(Nodes, treeView1.Nodes[0]);

Getting all visible Nodes in a TreeView

You can find the first visible node using Nodes collection and IsVisible property of the Node. Then create a recursive method which uses NextVisibleNode to find the next visible node in TreeView.

private void button1_Click(object sender, EventArgs e)
{
var visibleNodes = GetVisibleNodes(treeView1).ToList();
}
public IEnumerable<TreeNode> GetVisibleNodes(TreeView t)
{
var node = t.Nodes.Cast<TreeNode>().Where(x => x.IsVisible).FirstOrDefault();
while (node != null)
{
var temp = node;
node = node.NextVisibleNode;
yield return temp;
}
}

Also as another option, you can rely on Descendants extension method to flatten the TreeView and then using IsVisible property, get all visible nodes.

Get a list of all tree nodes (in all levels) in TreeView Controls

Assuming you have a tree with one root node the following code will always loop the tree nodes down to the deepest, then go one level back and so on. It will print the text of each node.
(Untested from the top of my head)

TreeNode oMainNode = oYourTreeView.Nodes[0];
PrintNodesRecursive(oMainNode);

public void PrintNodesRecursive(TreeNode oParentNode)
{
Console.WriteLine(oParentNode.Text);

// Start recursion on all subnodes.
foreach(TreeNode oSubNode in oParentNode.Nodes)
{
PrintNodesRecursive(oSubNode);
}
}

How do I find all TreeNodes?

I did it. Lei Yang was right but I didn't know what "recursively" meant. This is the solution:

private void DrawConnects(TreeNode node)
{
foreach (TreeNode child in node.Nodes)
{
if (child.Nodes.Count > 0)
{
listBox1.Items.Add(child.Parent); //Do what you want to do with the nodes here
DrawConnects(child);
} else
{
listBox1.Items.Add(child.Parent); // And here
}
}
}

How to Iterate through all nodes of a treeView Control. C#

Your mistake is that c is actually a variable of type Control, which does not have a Nodes member. You will need it to cast it as a TreeView type.

You can do either of these two approaches:

if (c is TreeView) 
{
TreeNodeCollection myNodes = ((TreeView) c).Nodes; // <<--- Note the cast
...
}

or

TreeView tv = c as TreeView;
if (tv != null)
{
TreeNodeCollection myNodes = tv.Nodes;
...
}

C# - Find a specific node or subnode of a treeview control

By iterating over TreeView->Nodes , you are getting only top level Nodes. TreeView->Nodes(of type TreeNodeCollection) has a Find(string, boolean) method that you can use to search for a node with specific text. You can call this method like

Repository_TreeView.Nodes.Find(specificPTN, true) 

to get all the matching nodes.

Set SelectAction on all tree nodes for ASP.NET TreeView control

TreeView does not support any property to do this. However you can do it by using recursive methods



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