I am using the following code to get the contents of a folder into a TreeView. But the current code always adds the contents to the root of the TreeView. It does not add them as child nodes of their parent folder's node.
Can you help me?
void Recurse(string path)
{
DirectoryInfo info = new DirectoryInfo(path);
TreeNode root = new TreeNode(info.Name);
string[] sub = Directory.GetDirectories(info.FullName);
TreeNode node = new TreeNode();
MailTree.Nodes.Add(root);
if (sub.Length == 0) {
}
else
{
foreach(string i in sub)
{
DirectoryInfo subinfo = new DirectoryInfo(i);
root.Nodes.Add(subinfo.Name);
Recurse(i);
}
//MailTree.Nodes.Add(root);
}
}
You should be passing a root node as part of your Rescure method, something like Rescure(string path, TreeNode currentRoot).
Now, you can call currentRoot.Nodes.Add(root) in place of MailTree.Nodes.Add(root), which will ensure that the brances are added only to the current level. You also need to change your call in the loop to Rescure(i, root).
Finally, your initial call to Rescure should include a reference to a pre-created root node, so something like Rescure(initialDirectory, initialRootNode).
One thing I would add is that your method and variable names should be changed to reflect their meaning. Yes, you are recursing, but why? A better name for the method might be TraverseDirectory. Similarly, rather than foreach(string i in sub), why not foreach(string directoryName in sub)? Having clear code is almost as important as having correct code.
The recursive part of your function is always adding the child nodes to the root. You need to add in the "parent node" as a parameter of your recursive function. Something like this:
void Recurse(string path, TreeNode parentNode)
{
DirectoryInfo info = new DirectoryInfo(path);
TreeNode node = new TreeNode(info.Name);
if (parentNode == null)
MailTree.Nodes.Add(node);
else
parentNode.Nodes.Add(node);
string[] sub = Directory.GetDirectories(path);
if (sub.Length != 0)
{
foreach(string i in sub)
{
Recurse(i, node);
}
}
}
I can't se any error in the code at a first glance, but I can suggesto to take another approach: the one you show is too expensive. Just fill a level on the tree, and put some dummy item as a leaf in each nodes you add. Then intercept the NodeExpanding event, remove the dummy node, and add the subnodes ( applying recursively the same strategy of adding the dummy child nodes )
Related
I didn't think this would be that hard to do but I have been stuck on this for the last 45 minutes or so. I am trying to make a recursive function that finds files in a directory and add them to the TreeView.
This is my method so far:
private void RecursiveAddToTree(string path, TreeNode parent)
{
var directories = Directory.GetDirectories(path);
var files = Directory.GetFiles(path);
foreach (var directory in directories)
{
var node = new TreeNode(getItemOrDirectoryName(directory)) {ImageIndex = 0, SelectedImageIndex = 1};
//this is where I need to add the child node to the parent node
RecursiveAddToTree(directory,node);
}
foreach (var file in files)
{
var node = new TreeNode(getItemOrDirectoryName(file)) {ImageIndex = 0, SelectedImageIndex = 0};
//this is where I need to add the child node to the parent node
}
}
I'm looking for a way to add a child node to a parent node given the parent node, but I can't seem to figure out how to do that.
When i'm running the program i see the root node
Countries
Then when i click on it i see all the countries nodes under Countries
But i want when running the program that it already will show all the countries nodes without clicking on Countries.
I tried in the constructor:
PopulateTree(mainPath, treeView1.Nodes.Add("Countries"));
treeView1.CollapseAll();
treeView1.Nodes[0].Expand();
The populatetree
public void PopulateTree(string dir, TreeNode node)
{
DirectoryInfo directory = new DirectoryInfo(dir);
foreach (DirectoryInfo d in directory.GetDirectories())
{
TreeNode t = new TreeNode(d.Name);
PopulateTree(d.FullName, t);
node.Nodes.Add(t);
}
foreach (FileInfo f in directory.GetFiles())
{
TreeNode t = new TreeNode(f.Name);
node.Nodes.Add(t);
}
}
But it's not doing it i still see Countries when running the program and to see all the childs nodes i need to click on Countries.
This lines not effect
treeView1.CollapseAll();
treeView1.Nodes[0].Expand();
TreeNode.Expand expands only Nodes[0] down to the next level of nodes. You should use TreeNode.ExpandAll to expand all child nodes of Countries node:
treeView1.Nodes[0].ExpandAll()
NOTE: There is one thing you should keep in mind. If handle is not created for TreeView control, then something like lazy collapsing-expanding is working here. I.e. each node has expandOnRealization and collapseOnRealization fields. When you are trying to expand node before tree handle is created, then just expandOnRealization flag is set to true. No TVM_EXPAND windows messages are sent to actually expand that node. Same for collapsing. When tree node is realized, then there is following code executed:
// If node expansion was requested before the handle was created,
// we can expand it now.
if (expandOnRealization) {
Expand();
}
// If node collapse was requested before the handle was created,
// we can expand it now.
if (collapseOnRealization) {
Collapse();
}
So, if node was marked both for collapsing and expanding, then it would be expanded first and then collapsed. I believe it's your case.
I have a method that is used as a threadsafe callback to update a treeview. It takes two string parameters. The first is the passed data and the second is the IP of the host it checked.
I am trying to check whether or not the treeview currently contains the string containing the input string and if it doesn't than it is supposed to add it to the treeview as a parent node, then add the ip string underneath as a child. Although if it does already contain that input string as a parent node than it should add only the Ip address underneath the parent that the data string matches. So it basically sorts the ips. Each parent node will have multiple ips underneath.
My issue is that my method is adding each string as it's own parent regardless if it is a duplicate, which also means that it is not adding the IP of the duplicate input underneath the parent. Can anyone take a look and see where I am going wrong?
public void UpdateScan(string input, string ip)
{
lock (outputTree)
{
outputTree.BeginUpdate();
if (!(outputTree.Nodes.ContainsKey(input)))
{
TreeNode treeNode = new TreeNode(input);
//Add our parent node
outputTree.Nodes.Add(treeNode);
//Add our child node
treeNode.Nodes.Add(ip);
}
else
{
TreeNode[] treeNode = outputTree.Nodes.Find(input, true);
//Add only child node
foreach (var node in treeNode)
{
node.Nodes.Add(ip);
}
}
outputTree.EndUpdate();
}
}
I was able to get it working. By dynamically adding a key containing the data to the parent node, so I can then use that key to find the parents to add the correct children to them.
public void UpdateScan(string input, string ip)
{
lock (outputTree)
{
outputTree.BeginUpdate();
if (! outputTree.Nodes.ContainsKey(input))
{
TreeNode treeNode = new TreeNode(input);
treeNode.Name = input;
//Add our parent node
outputTree.Nodes.Add(treeNode);
//Add our child node
treeNode.Nodes.Add(ip);
}
else
{
TreeNode[] found = outputTree.Nodes.Find(input, true);
TreeNode newChild = new TreeNode(ip);
//Add only child node
found[0].Nodes.Add(newChild);
}
outputTree.EndUpdate();
}
}
I've created a directory and file browser TreeView on the left side. I want the users to be able to browse the tree and check the files and directories that they would like to move to another treeview.
The other TreeView is a user control I found online called TreeViewColumn. I will be using that control to allow the user to add other data (categories, attributes) to the files and folders selected.
The trouble I'm running into is two-fold, I need to recursively add all children (I can figure this out) but I need to add unchecked parents to checked children (to preserve the hierarchy).
private void IterateTreeNodes(TreeNode originalNode, TreeNode rootNode)
{
//Take the node passed through and loop through all children
foreach (TreeNode childNode in originalNode.Nodes)
{
// Create a new instance of the node, will need to add it to the recursion as a root item
// AND if checked it needs to get added to the new TreeView.
TreeNode newNode = new TreeNode(childNode.Text);
newNode.Tag = childNode.Tag;
newNode.Name = childNode.Name;
newNode.Checked = childNode.Checked;
if (childNode.Checked)
{
// Now we know this is checked, but what if the parent of this item was NOT checked.
//We need to head back up the tree to find the first parent that exists in the tree and add the hierarchy.
if (tvSelectedItems.TreeView.Nodes.ContainsKey(rootNode.Name)) // Means the parent exist?
{
tvSelectedItems.TreeView.SelectedNode = rootNode;
tvSelectedItems.TreeView.SelectedNode.Nodes.Add(newNode);
}
else
{
AddParents(childNode);
// Find the parent(s) and add them to the tree with their CheckState matching the original node's state
// When all parents have been added, add the current item.
}
}
IterateTreeNodes(childNode, newNode);
}
}
private TreeNode AddParents(TreeNode node)
{
if (node.Parent != null)
{
//tvDirectory.Nodes.Find(node.Name, false);
}
return null;
}
Could anyone help with this code so that it recursively adds checked nodes (and their parent, regardless of checked state). I need to maintain directory hierarchy.
Thanks for any help!
A rather (not-so-clean and not-preferred) solution could be to clone the tree first, and then remove unchecked branches.
Else, when you are adding a node, write a recursive method to traverse through node's parent node until you hit the root. And simply optimize it by checking if childNode.parent already exists, just ignore the branch and move on. i.e. Backtrack to root node.
I got it working. I was already aware of what #Yahya was saying, I was hoping for an easier way / better approach.
The code below is certainly not optimal, I will continue improving it on my end but at this point it is looking through a treeview on the left and copying all of the checked items (and their parents - regardless of CheckedState) to a treeview on the right.
Hopefully this helps someone and thanks for answering #Yahya.
I'm open to improvements but keep in mind this is a one-time use utility.
private void cmdMoveRight_Click(object sender, EventArgs e)
{
tvSelectedItems.TreeView.Nodes.Clear();
// Traverse first level Tree Nodes
foreach (TreeNode originalNode in tvDirectory.Nodes)
{
TreeNode newNode = new TreeNode(originalNode.Text);
newNode.Name = originalNode.Name;
newNode.Tag = originalNode.Tag;
newNode.Checked = originalNode.Checked;
//Only add to the new treeview if the node is checked
if (originalNode.Checked)
{
tvSelectedItems.TreeView.Nodes.Find(originalNode.Parent.Name,true)[0].Nodes.Add(newNode);
}
//Start recursion - this will be called for each first level node - there should technically only be 1 "ROOT" node.
IterateTreeNodes(originalNode, newNode);
}
}
private void IterateTreeNodes(TreeNode originalNode, TreeNode rootNode)
{
//Take the node passed through and loop through all children
foreach (TreeNode childNode in originalNode.Nodes)
{
// Create a new instance of the node, will need to add it to the recursion as a root item
// AND if checked it needs to get added to the new TreeView.
TreeNode newNode = new TreeNode(childNode.Text);
newNode.Tag = childNode.Tag;
newNode.Name = childNode.Name;
newNode.Checked = childNode.Checked;
if (childNode.Checked)
{
// Now we know this is checked, but what if the parent of this item was NOT checked.
//We need to head back up the tree to find the first parent that exists in the tree and add the hierarchy.
TreeNode[] nodestest = tvSelectedItems.TreeView.Nodes.Find(childNode.Parent.Name, true);
if (nodestest.Length > 0)
{
tvSelectedItems.TreeView.Nodes.Find(childNode.Parent.Name,true)[0].Nodes.Add(newNode);
}
else
{
AddParents(childNode);// Find the parent(s) and add them to the tree with their CheckState matching the original node's state
}
}
//recurse
IterateTreeNodes(childNode, newNode);
}
}
private void AddParents(TreeNode node)
{
if (node.Parent != null)// Check if parent is null (would mean we're looking at the root item
{
TreeNode[] nodestest = tvSelectedItems.TreeView.Nodes.Find(node.Parent.Name, true);
if (nodestest.Length > 0)
{
TreeNode[] nodes = tvDirectory.Nodes.Find(node.Name, true);
TreeNode newNode = new TreeNode(nodes[0].Text);
newNode.Name = nodes[0].Name;
newNode.Tag = nodes[0].Tag;
newNode.Checked = nodes[0].Checked;
tvSelectedItems.TreeView.Nodes[node.Parent.Name].Nodes.Add(newNode);
}
else
{
AddParents(node.Parent);
TreeNode newNode = new TreeNode(node.Text);
newNode.Name = node.Name;
newNode.Tag = node.Tag;
newNode.Checked = node.Checked;
tvSelectedItems.TreeView.Nodes.Find(node.Parent.Name,true)[0].Nodes.Add(newNode);
}
}
else // deal with root node
{
TreeNode rootNode = new TreeNode(node.Text);
rootNode.Name = node.Name;
rootNode.Tag = node.Tag;
rootNode.Checked = node.Checked;
tvSelectedItems.TreeView.Nodes.Add(rootNode);
}
}
I have currently the following problem. I have a directory structure like
root
- level 1
- level 1.1
- level 1.2
- level 2
- level 2.1
- level 3
- level 4
- level 4.1
from this I want to build a menu. so root will be the menu item to click on and all the level will be needed to drill down to the information you want to get.
As I'm pretty new to C# (not programming) I wanted to know if there is any help from .NET for this task. I don't want to start to fiddel around with code that is already there...
Thanks for any input!
You can use the DirectoryInfo class to obtain a list of all sub-directories for a given root folder. You should the perform a recursive search on sub-directories and build your menu using that data.
Here is some code that will do the job for you, it assumes you already have a MenuStrip called menuStrip1:
public void BuildMenu()
{
//first we get the DirectoryInfo for your root folder, this will be used to find the first set of sub-directories
DirectoryInfo dir = new DirectoryInfo(#"C:\MyRootFolder\");//Change this
//next we create the first MenuItem to represent the root folder, this is created using the GetMenuItem function
ToolStripMenuItem root = GetMenuItem(dir);
//we add our new root MenuItem to our MenuStrip control, at this point all sub-menu items will have been added using our recursive function
menuStrip1.Items.Add(root);
}
public ToolStripMenuItem GetMenuItem(DirectoryInfo directory)
{
//first we create the MenuItem that will be return for this directory
ToolStripMenuItem item = new ToolStripMenuItem(directory.Name);
//next we loop all sub-directory of the current to build all child menu items
foreach (DirectoryInfo dir in directory.GetDirectories())
{
item.DropDownItems.Add(GetMenuItem(dir));
}
//finally we return the populated menu item
return item;
}
Dont forget to change the root folder path!
NOTE: Yorye Nathan has made a good point about short-cut folders. If any of your folders is a short-cut to a parent folder this will cause an endless loop. The easiest way to solve this is to make sure your structure doesn't contain any short-cuts. This may be an easy option for you assuming you have a specifically built structure for this application. If however, you are running this on a user-defined root folder you will want to check for these.
You could modify the GetMenuItem function as below to account for this, assuming .Net 3.5 or higher (LINQ + optional parameters):
public ToolStripMenuItem GetMenuItem(DirectoryInfo directory, List<DirectoryInfo> currentFolders = null)
{
if (currentFolders == null)
currentFolders = new List<DirectoryInfo>();
currentFolders.Add(directory);
ToolStripMenuItem item = new ToolStripMenuItem(directory.Name);
foreach (DirectoryInfo dir in directory.GetDirectories())
{
if (!currentFolders.Any(x => x.FullName == dir.FullName))//check to see if we already processed this folder (i.e. a unwanted shortcut)
{
item.DropDownItems.Add(GetMenuItem(dir, currentFolders));
}
}
return item;
}
EDITED Now supporting recursive folders (ignore to prevent endless loop)
public static MenuStrip CreateMenu(string rootDirectoryPath)
{
var dir = new DirectoryInfo(rootDirectoryPath);
var menu = new MenuStrip();
var root = new ToolStripMenuItem(dir.Name);
var includedDirs = new List<string> {dir};
menu.Items.Add(root);
AddItems(root, dir, includedDirs);
return menu;
}
private static void AddItems(ToolStripDropDownItem parent, DirectoryInfo dir, ICollection<string> includedDirs)
{
foreach (var subDir in dir.GetDirectories().Where(subDir => !includedDirs.Contains(subDir.FullName)))
{
includedDirs.Add(subDir.FullName);
AddItems((ToolStripMenuItem)parent.DropDownItems.Add(subDir.Name), subDir, includedDirs);
}
}
http://msdn.microsoft.com/en-us/library/bb513869.aspx
http://www.stillhq.com/dotnet/000003.html
http://www.codeproject.com/Articles/11599/Recursive-function-to-read-a-directory-structure