How to populate a TreeView control with XML using c#

Question

I am new to c# and the problem i am facing is that i have an XML file which include a list of process information with fields process id, process name and parent id. i nedd help in populating this xml file into tree view. The XML file is not formatted one. My XML file will look like:

<Process id="0" name="[System Process]" ParentPID="0" />
<Process id="4" name="System" ParentPID="0" />
<Process id="100" name="MyApp.exe" ParentPID="4" />
<Process id="120" name="avgrsx.exe" ParentPID="10"/>
<Process id="150" name="avgcsrvx.exe" ParentPID="120" />
<Process id="155" name="csrss.exe" ParentPID="100" />
<Process id="170" name="winlogon.exe" ParentPID="100" />
<Process id="180" name="services.exe" ParentPID="170" />
<Process id="200" name="lsass.exe" ParentPID="170" />
<Process id="110" name="svchost.exe" ParentPID="180" />
<Process id="380" name="svchost.exe" ParentPID="200"/>
<Process id="530" name="svchost.exe" ParentPID="1764" />
<Process id="420" name="Avg.exe" ParentPID="110" />

i want to create a tree view in c# which will look like:

0
|-4
|  |-100
|     |-155
|     |-170
|       |-180
|       |   |-110
|        |      |-420
|        |-200
|            |-380
|-10     
|  |-120
|     |-150  
|-155
|-1764
    |-530

Any help will greatly be appreciated. Thanks

Where is the element that has the id = 10

user586399
– user586399

2012-08-23 04:24:34 +00:00
Commented Aug 23, 2012 at 4:24 — user586399
– user586399, Commented Aug 23, 2012 at 4:24
Do you have <Process> tag for id = 10 and id = 1764?

Kishore Borra
– Kishore Borra

2012-08-23 04:31:24 +00:00
Commented Aug 23, 2012 at 4:31 — Kishore Borra
– Kishore Borra, Commented Aug 23, 2012 at 4:31

Rastus7 · Accepted Answer · 2012-08-23 04:58:23Z

Here's my solution for you:

    private TreeNode[] FindTreeNodes(string Key)
    {
        return oTreeView.Nodes.Find(Key, true);
    }

    private void LoadTreeview(string XmlFile)
    {
        oTreeView.Nodes.Clear();

        if (File.Exists(XmlFile) == true)
        {
            XmlDocument oXmlDocument = new XmlDocument();
            oXmlDocument.Load(XmlFile);

            XmlNodeList oXmlNodeList = oXmlDocument.SelectNodes("/Processes/Process");

            foreach (XmlNode oXmlNode in oXmlNodeList)
            {
                int iID = Convert.ToInt32(oXmlNode.Attributes["id"].Value);
                string sName = oXmlNode.Attributes["name"].Value;
                int iParentID = Convert.ToInt32(oXmlNode.Attributes["ParentPID"].Value);

                TreeNode[] oParentNodes = FindTreeNodes(iParentID.ToString());
                if (oParentNodes.Length == 0)
                {
                    TreeNode oTreeNode = new TreeNode();

                    oTreeNode.Name = iID.ToString();
                    oTreeNode.Text = String.Format("{0} ({1})", sName, iID);

                    oTreeView.Nodes.Add(oTreeNode);
                }
                else
                {
                    if (oParentNodes.Length > 0)
                    {
                        foreach (TreeNode oParentTreeNode in oParentNodes)
                        {
                            TreeNode oTreeNode = new TreeNode();

                            oTreeNode.Name = iID.ToString();
                            oTreeNode.Text = String.Format("{0} ({1})", sName, iID);

                            oParentTreeNode.Nodes.Add(oTreeNode);
                        }
                    }
                    else
                    {
                        Console.WriteLine("  ** Could not find the parent node {0} for child {1} ({2})", iParentID, sName, iID);
                    }
                }
            }
        }
    }

    protected override void OnLoad(EventArgs E)
    {
        base.OnLoad(E);

        LoadTreeview("Xml.xml");
    }

I've modified the XML a little to look like this - essentially, it's the same:

<?xml version="1.0" encoding="utf-8" ?>

<Processes>
  <Process id="0" name="[System Process]" ParentPID="0" />
  <Process id="4" name="System" ParentPID="0" />
  <!--
  <Process id="10" name="MissingNode" ParentPID="0" />
  <Process id="1764" name="MissingNode" ParentPID="0" />
  -->
  <Process id="100" name="MyApp.exe" ParentPID="4" />
  <Process id="120" name="avgrsx.exe" ParentPID="10"/>
  <Process id="150" name="avgcsrvx.exe" ParentPID="120" />
  <Process id="155" name="csrss.exe" ParentPID="100" />
  <Process id="170" name="winlogon.exe" ParentPID="100" />
  <Process id="180" name="services.exe" ParentPID="170" />
  <Process id="200" name="lsass.exe" ParentPID="170" />
  <Process id="110" name="svchost.exe" ParentPID="180" />
  <Process id="380" name="svchost.exe" ParentPID="200"/>
  <Process id="530" name="svchost.exe" ParentPID="1764" />
  <Process id="420" name="Avg.exe" ParentPID="110" />
</Processes>

Finally, the following nodes do not appear as there are no definitions for them within the XML:

10
1764

These appear commented out within the XML file included above.

Hope this is what you are looking for.

Cheers!

Thanks a lot for your valuable reply....i will try this way and soon get back to you

score 0 · Accepted Answer · 2012-08-23 04:22:52Z

0

Try the following algorithm:

       TreeNode[] arr = new TreeNode[elemCnt]

       arr[0] = new TreeNode with base (root) element

        For each XML element "Process":

                   Let v = Find parent node with linear search in ar


                   If v is not null ( parent found)

                               Add element as child to v

                   Add element to arr

        Add nodes that have null parents to TreeView.Nodes

edited Aug 23, 2012 at 4:22

answered Aug 23, 2012 at 4:10

user586399

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