Viacheslav Eremin | 3.3. My typical VB.NET desktop application. Fill TreeView and ListView without binding.

(NET) NET (2019)

3.3. My typical VB.NET desktop application. Fill TreeView and ListView without binding.

I have many descriptions how to fill TreeView with React, for example Multi Languages Spell Checker for webmaster. Part 3. Directory observer on NET Reactive extension., but in this page I describe simplest way to create TreeView nodes.

Firstly need to link ImageList to TreeView:

And after that you can fill treeview by the same way:

 265:

 266:      Sub BuildTreeView()

 267:          For Each Top As v_GetUsers1 In VGetUsers1BindingSource.DataSource

 268:              Dim TopNode = New TreeNode With {.Text = Top.UserName, .Tag = Top.UserID, .ImageIndex = 1}

 269:              TreeView1.Nodes.Add(TopNode)

 270:              For Each Box As p_GetMailBox1_Result In db1.p_GetMailBox1(Top.UserID).ToList

 271:                  Dim BoxNode As New TreeNode With {.Text = Box.login, .Tag = Box.idmailbox, .ImageIndex = 2}

 272:                  TopNode.Nodes.Add(BoxNode)

 273:                  Dim BoxType1 As New TreeNode With {.Text = "Inbox", .ImageIndex = 3}

 274:                  BoxNode.Nodes.Add(BoxType1)

 275:                  Dim BoxType2 As New TreeNode With {.Text = "Outbox", .ImageIndex = 4}

 276:                  BoxNode.Nodes.Add(BoxType2)

 277:                  Dim BoxType3 As New TreeNode With {.Text = "Sent", .ImageIndex = 5}

 278:                  BoxNode.Nodes.Add(BoxType3)

 279:                  Dim BoxType4 As New TreeNode With {.Text = "Deleted", .ImageIndex = 6}

 280:                  BoxNode.Nodes.Add(BoxType4)

 281:                  Dim BoxType5 As New TreeNode With {.Text = "Drafts", .ImageIndex = 7}

 282:                  BoxNode.Nodes.Add(BoxType5)

 283:                  Dim BoxType6 As New TreeNode With {.Text = "Filed", .ImageIndex = 8}

 284:                  BoxNode.Nodes.Add(BoxType6)

 285:                  Dim BoxType7 As New TreeNode With {.Text = "Search", .ImageIndex = 9}

 286:                  BoxNode.Nodes.Add(BoxType7)

 287:              Next

 288:          Next

Filling Listview without binding is pretty simple too:

 265:

 220:

 221:      Sub FillAttachmentListListView(Attachments As IEnumerable(Of MimeKit.MimeEntity))

 222:          AttachmentListListView.Items.Clear()

 223:          If Attachments.Count = 0 Then

 224:              AttachmentListListView.BackColor = SystemColors.Control

 225:          Else

 226:              AttachmentListListView.BackColor = SystemColors.Window

 227:              For Each One As MimeKit.MimePart In Attachments

 228:                  If One.IsAttachment Then

 229:                      Dim AttItem As New ListViewItem(One.FileName, 0)

 230:                      AttItem.ToolTipText = One.ContentType.ToString

 231:                      AttachmentListListView.Items.Add(AttItem)

 232:                  End If

 233:              Next

 234:              'AttachmentListListView.Columns(AttachmentListListView.Columns.Count - 1).Width = -2

 235:              AttachmentListListView.Refresh()

 236:          End If

Also in ListView I usually create own draw module, if I moving cursor out of ListView, selected row is showing as necessary.

Ti rich this need firstly set particular parameters to ListView

  18:          AttachmentListListView.OwnerDraw = True

And after that handles particular event:

 239:      Dim AttachmentListListViewLostFocusItem As Integer = -1

 240:      Private Sub AttachmentListListView_Leave(sender As Object, e As EventArgs) Handles AttachmentListListView.Leave

 241:          AttachmentListListViewLostFocusItem = AttachmentListListView.FocusedItem.Index

 242:      End Sub

 243:

 244:      Private Sub AttachmentListListView_DrawItem(sender As Object, e As DrawListViewItemEventArgs) Handles AttachmentListListView.DrawItem

 245:          If e.Item.Selected Then

 246:              If AttachmentListListViewLostFocusItem = e.Item.Index Then

 247:                  e.Item.ForeColor = Color.Black

 248:                  e.Item.BackColor = Color.LightBlue

 249:                  AttachmentListListViewLostFocusItem = -1

 250:              ElseIf AttachmentListListView.Focused Then

 251:                  e.Item.ForeColor = SystemColors.HighlightText

 252:                  e.Item.BackColor = SystemColors.Highlight

 253:              End If

 254:          Else

 255:              e.Item.ForeColor = AttachmentListListView.ForeColor

 256:              e.Item.BackColor = AttachmentListListView.BackColor

 257:          End If

 258:          e.DrawBackground()

 259:          e.DrawText()

 260:      End Sub

)

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