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comVB.
NET-TREEVIEWCONTROLVB.
NET-TREEVIEWCONTROLTheTreeViewcontrolisusedtodisplayhierarchicalrepresentationsofitemssimilartothewaysthefilesandfoldersaredisplayedintheleftpaneoftheWindowsExplorer.
Eachnodemaycontainoneormorechildnodes.
Let'sclickonaTreeViewcontrolfromtheToolboxandplaceitontheform.
PropertiesoftheTreeViewControlThefollowingaresomeofthecommonlyusedpropertiesoftheTreeViewcontrol:S.
NPropertyDescription1BackColorGetsorsetsthebackgroundcolorforthecontrol.
2BackgroundImageGetsorsetthebackgroundimagefortheTreeViewcontrol.
3BackgroundImageLayoutGetsorsetsthelayoutofthebackgroundimagefortheTreeViewcontrol.
4BorderStyleGetsorsetstheborderstyleofthetreeviewcontrol.
5CheckBoxesGetsorsetsavalueindicatingwhethercheckboxesaredisplayednexttothetreenodesinthetreeviewcontrol.
6DataBindingsGetsthedatabindingsforthecontrol.
7FontGetsorsetsthefontofthetextdisplayedbythecontrol.
8FontHeightGetsorsetstheheightofthefontofthecontrol.
9ForeColorThecurrentforegroundcolorforthiscontrol,whichisthecolorthecontrolusestodrawitstext.
10ItemHeightGetsorsetstheheightofeachtreenodeinthetreeviewcontrol.
11NodesGetsthecollectionoftreenodesthatareassignedtothetreeviewcontrol.
12PathSeparatorGetsorsetsthedelimiterstringthatthetreenodepathuses.
13RightToLeftLayoutGetsorsetsavaluethatindicateswhethertheTreeViewshouldbelaidoutfromright-to-left.
14ScrollableGetsorsetsavalueindicatingwhetherthetreeviewcontroldisplaysscrollbarswhentheyareneeded.
15SelectedImageIndexGetsorsetstheimagelistindexvalueoftheimagethatisdisplayedwhenatreenodeisselected.
16SelectedImageKeyGetsorsetsthekeyofthedefaultimageshownwhenaTreeNodeisinaselectedstate.
17SelectedNodeGetsorsetsthetreenodethatiscurrentlyselectedinthetreeviewcontrol.
18ShowLinesGetsorsetsavalueindicatingwhetherlinesaredrawnbetweentreenodesinthetreeviewcontrol.
19ShowNodeToolTipsGetsorsetsavalueindicatingToolTipsareshownwhenthemousepointerhoversoveraTreeNode.
20ShowPlusMinusGetsorsetsavalueindicatingwhetherplus-sign+andminus-signbuttonsaredisplayednexttotreenodesthatcontainchildtreenodes.
21ShowRootLinesGetsorsetsavalueindicatingwhetherlinesaredrawnbetweenthetreenodesthatareattherootofthetreeview.
22SortedGetsorsetsavalueindicatingwhetherthetreenodesinthetreeviewaresorted.
23StateImageListGetsorsetstheimagelistthatisusedtoindicatethestateoftheTreeViewanditsnodes.
24TextGetsorsetsthetextoftheTreeView.
25TopNodeGetsorsetsthefirstfully-visibletreenodeinthetreeviewcontrol.
26TreeViewNodeSorterGetsorsetstheimplementationofIComparertoperformacustomsortoftheTreeViewnodes.
27VisibleCountGetsthenumberoftreenodesthatcanbefullyvisibleinthetreeviewcontrol.
MethodsoftheTreeViewControlThefollowingaresomeofthecommonlyusedmethodsoftheTreeViewcontrol:S.
NMethodName&Description1CollapseAllCollapsesallthenodesincludingallchildnodesinthetreeviewcontrol.
2ExpandAllExpandsallthenodes.
3GetNodeAtGetsthenodeatthespecifiedlocation.
4GetNodeCountGetsthenumberoftreenodes.
5SortSortsalltheitemsinthetreeviewcontrol.
6ToStringReturnsastringcontainingthenameofthecontrol.
EventsoftheTreeViewControlThefollowingaresomeofthecommonlyusedeventsoftheTreeViewcontrol:S.
NEventDescription1AfterCheckOccursafterthetreenodecheckboxischecked.
2AfterCollapseOccursafterthetreenodeiscollapsed.
3AfterExpandOccursafterthetreenodeisexpanded.
4AfterSelectOccursafterthetreenodeisselected.
5BeforeCheckOccursbeforethetreenodecheckboxischecked.
6BeforeCollapseOccursbeforethetreenodeiscollapsed.
7BeforeExpandOccursbeforethetreenodeisexpanded.
8BeforeLabelEditOccursbeforethetreenodelabeltextisedited.
9BeforeSelectOccursbeforethetreenodeisselected.
10ItemDragOccurswhentheuserbeginsdragginganode.
11NodeMouseClickOccurswhentheuserclicksaTreeNodewiththemouse.
12NodeMouseDoubleClickOccurswhentheuserdouble-clicksaTreeNodewiththemouse.
13NodeMouseHoverOccurswhenthemousehoversoveraTreeNode.
14PaddingChangedOccurswhenthevalueofthePaddingpropertychanges.
15PaintOccurswhentheTreeViewisdrawn.
16RightToLeftLayoutChangedOccurswhenthevalueoftheRightToLeftLayoutpropertychanges.
17TextChangedOccurswhentheTextpropertychanges.
TheTreeNodeClassTheTreeNodeclassrepresentsanodeofaTreeView.
EachnodeinaTreeViewcontrolisanobjectoftheTreeNodeclass.
TobeabletouseaTreeViewcontrolweneedtohavealookatsomecommonlyusedpropertiesandmethodsoftheTreeNodeclass.
PropertiesoftheTreeNodeClassThefollowingaresomeofthecommonlyusedpropertiesoftheTreeNodeclass:S.
NPropertyDescription1BackColorGetsorsetsthebackgroundcolorofthetreenode.
2CheckedGetsorsetsavalueindicatingwhetherthetreenodeisinacheckedstate.
3ContextMenuGetstheshortcutmenuthatisassociatedwiththistreenode.
4ContextMenuStripGetsorsetstheshortcutmenuassociatedwiththistreenode.
5FirstNodeGetsthefirstchildtreenodeinthetreenodecollection.
6FullPathGetsthepathfromtheroottreenodetothecurrenttreenode.
7IndexGetsthepositionofthetreenodeinthetreenodecollection.
8IsEditingGetsavalueindicatingwhetherthetreenodeisinaneditablestate.
9IsExpandedGetsavalueindicatingwhetherthetreenodeisintheexpandedstate.
10IsSelectedGetsavalueindicatingwhetherthetreenodeisintheselectedstate.
11IsVisibleGetsavalueindicatingwhetherthetreenodeisvisibleorpartiallyvisible.
12LastNodeGetsthelastchildtreenode.
13LevelGetsthezero-baseddepthofthetreenodeintheTreeViewcontrol.
14NameGetsorsetsthenameofthetreenode.
15NextNodeGetsthenextsiblingtreenode.
16NodesGetsthecollectionofTreeNodeobjectsassignedtothecurrenttreenode.
17ParentGetstheparenttreenodeofthecurrenttreenode.
18PrevNodeGetstheprevioussiblingtreenode.
19PrevVisibleNodeGetsthepreviousvisibletreenode.
20TagGetsorsetstheobjectthatcontainsdataaboutthetreenode.
21TextGetsorsetsthetextdisplayedinthelabelofthetreenode.
22ToolTipTextGetsorsetsthetextthatappearswhenthemousepointerhoversoveraTreeNode.
23TreeViewGetstheparenttreeviewthatthetreenodeisassignedto.
MethodsoftheTreeNodeClassThefollowingaresomeofthecommonlyusedmethodsoftheTreeNodeclass:S.
NMethodName&Description1CollapseCollapsesthetreenode.
2ExpandExpandsthetreenode.
3ExpandAllExpandsallthechildtreenodes.
4GetNodeCountReturnsthenumberofchildtreenodes.
5RemoveRemovesthecurrenttreenodefromthetreeviewcontrol.
6ToggleTogglesthetreenodetoeithertheexpandedorcollapsedstate.
7ToStringReturnsastringthatrepresentsthecurrentobject.
ExampleInthisexample,letuscreateatreeviewatruntime.
Let'sdoubleclickontheFormandputthefollowcodeintheopenedwindow.
PublicClassForm1PrivateSubForm1_Load(senderAsObject,eAsEventArgs)HandlesMyBase.
Load'createanewTreeViewDimTreeView1AsTreeViewTreeView1=NewTreeView()TreeView1.
Location=NewPoint(10,10)TreeView1.
Size=NewSize(150,150)Me.
Controls.
Add(TreeView1)TreeView1.
Nodes.
Clear()'CreatingtherootnodeDimroot=NewTreeNode("Application")TreeView1.
Nodes.
Add(root)TreeView1.
Nodes(0).
Nodes.
Add(NewTreeNode("Project1"))'CreatingchildnodesunderthefirstchildForloopindexAsInteger=1To4TreeView1.
Nodes(0).
Nodes(0).
Nodes.
Add(New_TreeNode("SubProject"&Str(loopindex)))Nextloopindex'creatingchildnodesundertherootTreeView1.
Nodes(0).
Nodes.
Add(NewTreeNode("Project6"))'creatingchildnodesunderthecreatedchildnodeForloopindexAsInteger=1To3TreeView1.
Nodes(0).
Nodes(1).
Nodes.
Add(New_TreeNode("ProjectFile"&Str(loopindex)))Nextloopindex'Setthecaptionbartextoftheform.
Me.
Text="tutorialspoint.
com"EndSubEndClassWhentheabovecodeisexecutedandrunusingStartbuttonavailableattheMicrosoftVisualStudiotoolbar,itwillshowthefollowingwindow:Youcanexpandthenodestoseethechildnodes:Loading[MathJax]/jax/output/HTML-CSS/jax.
js