How to find all the checked nodes in a Treeview using C# - c#

This is the code which I am using, but I am always getting a blank string from the function.
How do I solve such a problem?
private string GetArrayofCheckedNodes()
{
string arrCheckedNodes = "";
ArrayList al = new ArrayList();
foreach (TreeNode node in TreeView1.Nodes)
{
if (node.Checked == true) // Checking whether a node is checked or not.
{
al.Add(node.Text);
}
}
for (int i = 0; i < al.Count; i++)
{
arrCheckedNodes += al[i].ToString() + " , ";
}
return arrCheckedNodes;
}

I'm assuming you want ALL checked nodes. TreeView1.Nodes only returns the first level so you will need to recurse down the tree. Also, you can use string.Join() to join the resultant values together.
private string GetArrayofCheckedNodes()
{
return string.Join(" , ", GetCheckedNodes(treeView1.Nodes));
}
public List<string> GetCheckedNodes(TreeNodeCollection nodes)
{
List<string> nodeList = new List<string>();
if (nodes == null)
{
return nodeList;
}
foreach (TreeNode childNode in nodes)
{
if (childNode.Checked)
{
nodeList.Add(childNode.Text);
}
nodeList.AddRange(GetCheckedNodes(childNode.Nodes));
}
return nodeList;
}

Related

How can i conver treeView1 selectednodes collection to List<string>?

This is what i tried:
List<string> filestodownload = new List<string>(treeViewMS1.SelectedNodes);
This is not working. treeViewMS1 is just like a regular treeView control but with multi nodes selection option.
The problem is how can i loop over the Selected Nodes and add the text property of each node to the List ?
Add recursive method if you want to search for checked nodes in depth.
private void GetNodesText(TreeNodeCollection tnc, List<string> selectednodes)
{
foreach (TreeNode node in tnc)
{
if (node.Nodes.Count > 0)
GetNodesText(node.Nodes, selectednodes);
if (node.Checked)
selectednodes.Add(node.Text);
}
}
And then call that method:
var selectednodes = new List<string>();
GetNodesText(treeView1.Nodes, selectednodes);
if (treeViewMS1.CheckedNodes.Count > 0)
{
List<string> _selectednodes = new List<string>();
foreach (TreeNode node in treeViewMS1.CheckedNodes)
{
if(node.Parent != null)
{
string checkedValue = node.Text.ToString();
_selectednodes.Add(checkedValue);
}
}
}

How to set position while traversing through Treeview

I want to traverse through a treeview & set the value property to be its position in the tree as shown below
A[val:1]->A1[val:11]
l l--->A2[val:12]
l----->A3[val:13]
B[val:2]->B1[val:21]
l l--->B2[val:22]
C[val:3]->C1[val:31]
l l--->C2[val:32]
I have written a recursive which returns me all the nodes but i am unable to assign the desired position to its nodes.
private void TraverseTreeNode(TreeNodeCollection nodes)
{
foreach (TreeNode node in nodes)
{
TraverseTreeNode(node.ChildNodes);
}
}
Considering that TreeNode.Value is of type string, this will, starting at level = 1:
private static void TraverseTreeNode(TreeNodeCollection nodes, int parentNumber)
{
var childNumber = 1;
foreach (TreeNode node in nodes)
{
node.Value = string.Format("{0}{1}", parentNumber, childNumber ).Substring(0,node.Depth+1);
TraverseTreeNode(node.ChildNodes, parentNumber);
childNumber++;
if (node.Depth == 0) { parentNumber++; }
}
}
Only works for two levels but is easily extendable by adding additional parameters to TraverseTreeNode.
UPDATE
The following will work for any depth in hierarchy:
private static void TraverseTreeNode(TreeNodeCollection nodes, int parentNumber)
{
var childNumber = 1;
foreach (TreeNode node in nodes)
{
node.Value = node.Parent != null && node.Parent.Value != null
? string.Format("{0}{1}", node.Parent.Value, childNumber)
: string.Format("{0}{1}", parentNumber, childNumber).Substring(0, node.Depth + 1);
TraverseTreeNode(node.ChildNodes, parentNumber);
childNumber++;
if (node.Depth == 0) { parentNumber++; }
}
}
As you need recursive method, try this
private void Caller()
{
TraverseTreeNode(treeView1.Nodes);
}
private void TraverseTreeNode(TreeNodeCollection nodes)
{
int index = 1;
foreach (TreeNode node in nodes)
{
node.Text = (node.Parent != null ? node.Parent.Text : string.Empty) + index++;
TraverseTreeNode(node.Nodes);
}
}

I want to have an action to all of a treeview's nodes

I have a windows application in c# with a tree view .now i want to check all nodes of that tree view including node's of nodes .
i tried this code :
for (int i = 0; i < treevwaccess.Nodes.Count; i++)
{
formid = treevwaccess.Nodes[i].Name;
access = treevwaccess.Nodes[i].Checked;
user.updateaccesslevel(lblId.Text, formid, access);
}
but this code only check nodes in level 0
You have to use either a Stack or a recursive method like this:
DoStuff(treevwaccess.Nodes);
...
void DoStuff(TreeNodeCollection nodes)
{
foreach(TreeNode node in nodes)
{
user.updateaccesslevel(lblId.Text, node.Name, node.Checked);
DoStuff(node.Nodes);
}
}
You need to create and call recursive function like this
static void main()
{
var treevwaccess = new System.Windows.Forms.TreeView();
CheckAll(treevwaccess.Nodes);
}
static void CheckAll(System.Windows.Forms.TreeNodeCollection nodes )
{
foreach (System.Windows.Forms.TreeNode node in nodes)
{
var formid = node.Name;
var access = node.Checked;
user.updateaccesslevel(lblId.Text, formid, access);
CheckAll(node.Nodes);
}
}
You have to check child node of root node too.
For that please try this code.
for (int i = 0; i < treevwaccess.Nodes.Count; i++)
{
formid = treevwaccess.Nodes[i].Name;
access = treevwaccess.Nodes[i].Checked;
user.updateaccesslevel(lblId.Text, formid, access);
CheckChildNodes(treevwaccess.Nodes[i]);
}
void CheckChildNodes(TreeNode node)
{
if (node.Nodes.Count > 0)
{
for (int i = 0; i < node.Nodes.Count; i++)
{
formid = node.Nodes[i].Name;
access = node.Nodes[i].Checked;
user.updateaccesslevel(lblId.Text, formid, access);
}
}
}
This will help you.

Compare treeView nodes Text to a String

I'm working on a Winform application, how can I check if there is a treeNode that its text is inside string Mystring? And how can i retrieve the tag of this node please?
if (myString.Contains(treeView1.Nodes.ToString()))
This works for only first matched node.
private TreeNode FindMatchedNode(TreeNodeCollection tnCol, string text)
{
TreeNode tn = null;
foreach (TreeNode node in tnCol)
{
if (text.ToLower().Contains(node.Text.ToLower()))
{
tn = node;
break;
}
else if (node.Nodes != null)
{
tn = FindNode(node.Nodes, text);
if (tn != null)
break;
}
}
return tn;
}
and for all matched nodes
private List<TreeNode> FindAllMatchedNodes(TreeNodeCollection tnCol, string text)
{
List<TreeNode> retVal = new List<TreeNode>();
foreach (TreeNode node in tnCol)
{
if (text.ToLower().Contains(node.Text.ToLower()))
{
retVal.Add(node);
}
else if (node.Nodes != null)
{
retVal.AddRange(FindNode(node.Nodes, text));
}
}
return retVal;
}
This method will traverse tree from root and find first node that Text is inside of myString
public object FindNode()
{
var queue = new Queue<TreeNode>();
foreach (var n in treeView1.Nodes)
{
// Add all root nodes to queue
queue.Enqueue(n);
}
while (queue.Count > 0)
{
// Take the next node from the front of the queue
var node = queue.Dequeue();
// Check if myString contains node text
if (myString.Contains(node.Text))
return node.Tag;
// Add the node’s children to the back of the queue
foreach (var child in node.Children)
{
queue.Enqueue(child);
}
}
// None of the nodes matched the specified string.
return null;
}

treeview how to expand a fullpath

I need to expand my treeview based on a fullpath in c#
My tree view has 2 nodes which are collapsed and I want to expand Node A to number 3
so I have the fullpath of node A\1\2\3.
How can I step through and open each node based of the fullpath? Also the length of the fullpath may change, so i may need to open node be to level 6. So it needs to be done based on the fullpath. Any help would be great.
Node A
1
2
3
Node B
1
2
3
4 5 6
This is what I've tried:
TreeNode [] n= treeView1.Nodes.Find(search, true);
if (n.Length > 0)
found = true;
treeView1.Nodes[t].Collapse();
foreach (TreeNode p in n) {
string[] a = p.FullPath.Split('\\');
foreach (string b in a) {
treeView1.SelectedNode = treeView1.Nodes[b];
treeView1.SelectedNode.Expand();
I'm sorry for not commenting on above answer given by S3ddi9 which is CORRECT. I'm only adding something.
So the answer given by S3ddi9
...
string path = #"A\1\2\";
var path_list = path.Split('\\').ToList();
foreach (TreeNode node in treeView1.Nodes)
if (node.Text == path_list[0])
ExpandMyLitleBoys(node, path_list);
}
private void ExpandMyLitleBoys(TreeNode node, List<string> path)
{
path.RemoveAt(0);
node.Expand();
if (path.Count == 0)
return;
foreach (TreeNode mynode in node.Nodes)
if (mynode.Text == path[0])
{
ExpandMyLitleBoys(mynode, path); //recursive call
break; //this was missing in earlier answer
}
}
Does work, BUT you must add a BREAK (I marked it), because if the for loop doesn't finish, return; won't return you to your main function and it will throw you an exception because path[0] is null.
I hope this will be more simpler, for Treeviews the best approach is to use recursive methods
...
string path = #"A\1\2\";
var path_list = path.Split('\\').ToList();
foreach (TreeNode node in treeView1.Nodes)
if (node.Text == path_list[0])
ExpandMyLitleBoys(node, path_list);
}
private void ExpandMyLitleBoys(TreeNode node, List<string> path)
{
path.RemoveAt(0);
node.Expand();
if (path.Count == 0)
return;
foreach (TreeNode mynode in node.Nodes)
if (mynode.Text == path[0])
ExpandMyLitleBoys(mynode, path); //recursive call
}
this does the work perfectly
Cracked it!!
TreeNode[] n = treeView1.Nodes.Find(search, true);
if (n.Length > 0)
found = true;
treeView1.Nodes[t].Collapse();
foreach (TreeNode p in n)
{
i = 0;
string[] a = p.FullPath.Split('\\');
foreach (string b in a)
{
if (i == 0)
{
treeView1.SelectedNode = treeView1.Nodes[b];
current = treeView1.Nodes[b];
treeView1.SelectedNode.Expand();
i = 1;
}
else
{
treeView1.SelectedNode = current.Nodes[b];
current = current.Nodes[b];
treeView1.SelectedNode.Expand();
if (b.ToUpper().Contains(search))
{
treeView1.SelectedNode.BackColor = System.Drawing.Color.Red;
}
I wrote a little simpler routine that works great. no recursion at all...
This assumes your path is a full file path like... "C:\program files\myapp" and when you add your nodes you set the node Key equal to the folder name
string[] strFolders = strPath.Split('\'));
System.Windows.Forms.TreeNode CurrentNode = null;
System.Windows.Forms.TreeNode[] FoundNodes = null;
foreach (string folder in strFolders) {
if (!folder.Contains(":")) {
if (CurrentNode == null) {
FoundNodes = treeFolders.Nodes.Find(folder, false);
} else {
FoundNodes = CurrentNode.Nodes.Find(folder, false);
}
if (FoundNodes.Length > 0) {
CurrentNode = FoundNodes[0];
CurrentNode.Expand();
} else {
//no folder found. cant continue
break;
}
}
}
if (CurrentNode != null) {
treeFolders.SelectedNode = CurrentNode;
}

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