Populate Treeview control from an XML file in C#.net
The following Program loads an XML file into a tree view control.
using System.Xml;
private void btnLoadXMLFile_Click(object sender, System.EventArgs e)
{ try
{
string strXPath = "XML/I140";
string strRootNode = "Treeview Demo";
string strXMLFile = @"C:\CSharpCode\Treeview.xml";
// Load the XML file.
XmlDocument dom = new XmlDocument();
dom.Load(strXMLFile);
// Load the XML into the TreeView.
this.treeView1.Nodes.Clear();
this.treeView1.Nodes.Add(new TreeNode(strRootNode));
TreeNode tNode = new TreeNode();
tNode = this.treeView1.Nodes[0];
XmlNodeList oNodes = dom.SelectNodes(strXPath);
XmlNode xNode = oNodes.Item(0).ParentNode;
AddNode(ref xNode, ref tNode);
this.treeView1.CollapseAll();
this.treeView1.Nodes[0].Expand();
this.Cursor = System.Windows.Forms.Cursors.Default;
}
catch (Exception ex)
{ MessageBox.Show(ex.Message, "Error");
}
}
private void AddNode(ref XmlNode inXmlNode, ref TreeNode inTreeNode)
{ // Recursive routine to walk the XML DOM and add its nodes to a TreeView.
XmlNode xNode;
TreeNode tNode;
XmlNodeList nodeList;
int i;
// Loop through the XML nodes until the leaf is reached.
// Add the nodes to the TreeView during the looping process.
if (inXmlNode.HasChildNodes)
{ nodeList = inXmlNode.ChildNodes;
for (i = 0; i <= nodeList.Count - 1; i++)
{ xNode = inXmlNode.ChildNodes[i];
inTreeNode.Nodes.Add(new TreeNode(xNode.Name));
tNode = inTreeNode.Nodes[i];
AddNode(ref xNode, ref tNode);
}
}
else
{ inTreeNode.Text = inXmlNode.OuterXml.Trim();
}
}
private void btnExpand_Click(object sender, System.EventArgs e)
{ if (this.btnExpand.Text == "Expand All Nodes")
{ this.treeView1.ExpandAll();
this.btnExpand.Text = "Collapse All Nodes";
}
else
{ this.treeView1.CollapseAll();
this.treeView1.Nodes[0].Expand();
this.btnExpand.Text = "Expand All Nodes";
}
}