How do I add multi level nodes using tree view?

Question

5.00/5 (1 vote)

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i am currently holding data in string array with '.' seperation. i need to plot the same data in tree view.
eg.

string[] tagdata = {"TestAlarm1.T1", "Test1.S1.S4", "TestAlarm1.T2", "test2.T1", "Test1.S1.S2.Tag1"};

What I have tried:

i have wriiten following code, but i am getting multiple parent node of same name which is wrong.

private void Form1_Load(object sender, EventArgs e)
        {
            TreeNode node = null;

            string[] tagdata = {"TestAlarm1.T1", "Test1.S1.S4", "TestAlarm1.T2", "test2.T1", "Test1.S1.S2.Tag1"};

            for (int i = 0; i < tagdata.Length; i++)
            {
                string[] data = tagdata[i].Split('.');

                for (int j = 0; j < data.Length; j++)
                {
                    if (j == 0)
                    {
                        node = treeView1.Nodes.Add(data[j]);
                    }
                    else
                    {
                        node.Nodes.Add(data[j]);
 
                    }
                }
            }
}

Posted 20-Feb-19 0:03am

Member 12694392

Updated 20-Feb-19 0:36am

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Comments

Richard MacCutchan 20-Feb-19 6:31am

You need to check first if a node name already exists in the tree, before you add it.

Member 12694392 20-Feb-19 6:37am

that is what i am trying to figure out how it can be done. please help

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OriginalGriff · Accepted Answer · 2019-02-20T00:36:00

{"TestAlarm1.T1", "Test1.S1.S4", "TestAlarm1.T2", "test2.T1", "Test1.S1.S2.Tag1"}

Needs to be built as

"TestAlarm1"
   "T1"
   "T2"
"Test1"
   "S1"
      "S4"
      "S2"
         "Tag1"
"test2"
   "T1"

So Split the string and look at the first element. Does it exist in the tree Nodes list?
If not, create it.
If so, use that.
Then look at the second element: does it exist in the first node Nodes list?
If not, create it.
If so, use that.
And so on.

At the moment, you only change nodes when you are at the "root element" - but your data doesn't reflect that, you have three levels of data.
And you don't check to see if a node is already there at all!

Quote:
the string added is just for example, data can have any number of sub parent,child. i need the actual logic to compare the current holding string value with all nodes in tree view. i am stuck at this place only

And that is what I gave you!

It's pretty simple:

string[] tagdata = { "TestAlarm1.T1", "Test1.S1.S4", "TestAlarm1.T2", "test2.T1", "Test1.S1.S2.Tag1" };
myTreeView.Nodes.Clear();

TreeNode node;
foreach (string tag in tagdata)
    {
    string[] data = tag.Split('.');
    TreeNodeCollection nodes = myTreeView.Nodes;
    foreach (string name in data)
        {
        if (nodes.ContainsKey(name))
            {
            node = nodes[name];
            }
        else
            {
            node = new TreeNode(name);
            node.Name = name;
            nodes.Add(node);
            }
        nodes = node.Nodes;
        }
    }

Only took 3 minutes to design, write, and test...