Add to treeView not working

wow

Hi there,

I can't get the line that was read from the file added to my treeview. So here is what my code is doing. It reads through a file line by line and adds a line at a time into my treeview. My code runs through with no error.

+ tree
|___ node1
|___ line < line should be inserted here, but not working >

Any help or pointers is greatly appreciated.

 StreamReader sr = new StreamReader(somefile);

while(line = sr.ReadLine() != null)
{
   TreeNode tn = new TreeNode();
   tn.text = line;

   MessageBox.Show(line);  // Test to see if it reaches here and what the node before adding.

   treeView1.Nodes[0].Nodes[0].Nodes.Add(tn);
}

7 Replies

Know the answer? Post it — somebody with the same question will find it here.

theLizard17y ago
Accepted answer
A simpler solution to try
TreeView1.Nodes.Add("Home");
tv.Nodes[0].Nodes[0].Nodes.Add("Child");
or this
TreeNode SelNode
SelNode = TreeView1.Nodes.Add("Home")
SelNode = SelNode.Nodes.Add("Child");

StreamReader sr = new StreamReader(somefile);

while((line = sr.ReadLine()) != null){
MessageBox.Show(line);
SelNode.Nodes.Add(line);
}
theLizard
wow17y ago
Thanks you for you help. I found my problem. I'm creating a new instance of the form where I'm adding too and not adding to the old one. So, both of the solutions work. It was my little mistake in the end.

Thanks,
theLizard17y ago
Start with the basics without trying to load from a stream.

put a treeview on your form then in form load

        private void Form1_Load(object sender, EventArgs e)
           {
           TreeNode rootNode;

           rootNode = TreeView1.Nodes.Add("Home"); //this adds a node with the TEXT being "Home"
            rootNode.Nodes.Add("Child1");    //this adds a child node to the parent node with the TEXT being "Child"
            rootNode.Nodes.Add("Child2");                      //what is between the quotes (") is irrelevant,
                                                                                   //it is simply the text you want to see at that node level
            rootNode.Nodes.Add("Child3");

           }

If this does not work you have a problem.
wow17y ago
So I tried both solutions and it does not seem to be adding to my treeview1. In the .Add() function, am I suppose to put the node name in quotes like if the parent node and the child of that parent if I wanted to add to that child. treeView1.Nodes.Add("tree"); // Should "tree" be the name or "Node0" treeView1.Nodes[0].Nodes.Add("node1"); // Same for here too. I'm not quite sure on the above. I tried both and they did not work either. So I don't know what is going on. I put the MessageBox.Show() before it prints and it does show the box with the line content. When I go back to check the tree view, nothing is added. I've been struggling at this for so long now. Any pointers to what I should do next?
wow17y ago
Thank you guys,

I didn't have the time to work it over the weekend. So I am working out the solutions you both provided to me. Thank you so much for your help. I will definitely come back to this ASAP when I have solved this and mark it solved.
jinge17y ago
Hello guy, please let us know if your problem is not solved.
jinge17y ago
Untitled 2
1. ABC
2. BCD
3. DEF
  
  We can then use the following code to add the nodes to the treeview.
  
                     string line;
  
              StreamReader sr = new StreamReader("File.txt");
  
              treeView1.Nodes.Add("tree");
  
              treeView1.Nodes[0].Nodes.Add("node1");
  
              while((line = sr.ReadLine()) != null){
  
                  TreeNode tn = new TreeNode();
  
                  tn.Text = line;
  
  
  
                  MessageBox.Show(line);
  
                  // Test to see if it reaches here and what the node before adding.
  
                  treeView1.Nodes[0].Nodes[0].Nodes.Add(tn);}
  
  The result is:
  
  +tree
  
        -Node
  
             -ABC
  
             -BCD
  
             -DEF