Tuesday, October 27, 2009

Parent node image getting selected when click on others child nodes in the TreeView

Parent node image getting selected when click on others child nodes in the TreeView
While working with tree view control having some images, I faced following issue.
My treeview control has some text value and image in the parent nodes and corresponding child nodes. I bind treeview control with imagelist control to display image in the treeview. Image got binded properly and working fine, BUT when I clicks on the child nodes or some other nodes, very first parent node image get replaced with existing node image.
Solution: while binding the image into treeview nodes use "SelectedImageIndex" property along with "ImageIndex" property with same image index number.
parentNode.ImageIndex = 0
parentNode.SelectedImageIndex = 0
VB.NET Source Code
Below the vb.net source code to bind image with the treeview controls
Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
'Load the Imagelist with desired images
Dim customImageList As New ImageList
customImageList.Images.Add("AMandatory", Bitmap.FromFile("C:\AMandatory.ico"))
customImageList.Images.Add("BDiscretionary", Bitmap.FromFile("C:\BDiscretionary.ico"))
customImageList.Images.Add("AAMandatory", Bitmap.FromFile("C:\AAMandatory.ico"))
customImageList.Images.Add("BBDiscretionary", Bitmap.FromFile("C:\BBDiscretionary.ico"))
'Bind ImageList with TreeView
TreeView1.ImageList = customImageList
'Create a ParentNode
Dim rootNodeMandatory As TreeNode = TreeView1.Nodes.Add("Mandatory Text")
'Bind first image from imagelist
rootNodeMandatory.ImageIndex = 0
rootNodeMandatory.SelectedImageIndex = 0
'Create the child Node
Dim childNodeMandatory As TreeNode
childNodeMandatory = rootNodeMandatory.Nodes.Add("Mandatory Child Text")
'Bind third image from imagelist
childNodeMandatory.ImageIndex = 2
childNodeMandatory.SelectedImageIndex = 2
'Create another ParentNode
Dim rootNodeDiscretionary As TreeNode = TreeView1.Nodes.Add("Discretionary Text")
'bind second image from imagelist
rootNodeDiscretionary.ImageIndex = 1
rootNodeDiscretionary.SelectedImageIndex = 1
'Create the child Node
Dim childNodeDiscretionary As TreeNode
childNodeDiscretionary = rootNodeDiscretionary.Nodes.Add("Discretionary Child Text")
'Bind fourth image from imagelist
childNodeDiscretionary.ImageIndex = 3
childNodeDiscretionary.SelectedImageIndex = 3
End Sub

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