Treeview BindingMode.TwoWay

Treeview BindingMode.TwoWay

Posted by: kbj on 30 December 2023, 9:09 am EST

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  kbj

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  Posted 30 December 2023, 9:09 am EST - Updated 30 December 2023, 9:16 am EST

  In the following form with a treeview named tv and a button Button1:

  Imports System.ComponentModel
  Imports C1.Win.TreeView
  Public Class Form1
      Private root As New classData
      Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
          tv.SuspendLayout()
          root.children.Add(New classData)
          Text = root.children.Count
      End Sub
      Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
          tv.BindingInfo.DataSource = root.children
          tv.BindingInfo.DataMember = "children"
          tv.BindingInfo.BindingMode = BindingMode.TwoWay
      End Sub
  End Class
  Public Class classData
      Public Property children As New BindingList(Of classData)
  End Class

  When adding the second record.

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  kbj

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  Posted 1 January 2024, 3:39 am EST

  Note: this only happens when

  tv.BindingInfo.BindingMode = BindingMode.TwoWay

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  kartik.dua

  

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  Posted 1 January 2024, 10:50 pm EST

  Hi Kingman,

  Thank you for providing the sample code. We could see the behavior you mentioned on our end. We have shared the observations with the development team to get their insights on it and will let you know the updates as soon as possible.

  In the meantime, as a workaround, you can wrap the code to add the new node between the BeginUpdate and EndUpdate method calls. It resolved the behavior on our end. Please refer to the attached sample project for reference.

  Attachment: TreeView.TwoWayBinding.zip

  [Internal Tracking ID: C1WIN-31518]

  Best Regards,
  
  Kartik