windowsforms-devexpress-dot-xtratreelist-dot-treelist-69c671b2.md
Collapses all the nodes in the Tree List.
Namespace : DevExpress.XtraTreeList
Assembly : DevExpress.XtraTreeList.v25.2.dll
NuGet Packages : DevExpress.Win.Navigation, DevExpress.Win.TreeList
public virtual void CollapseAll()
Public Overridable Sub CollapseAll
Use the methods below to expand and collapse tree list nodes.
TreeList.ExpandAll—expands all nodes.
TreeList.CollapseAll—collapses all nodes.
TreeList.ExpandToLevel(System.Int32)—expands nodes up to the specified level. The zeroth level corresponds to root nodes. To obtain a node’s level, use the TreeListNode.Level property.
TreeList.CollapseToLevel(System.Int32)—collapses all nodes at the specified and subsequent levels.
TreeListNode.ExpandAll—expands the node’s child nodes.
TreeListNode.CollapseAll—collapses the node’s child nodes.
TreeListNode.Expand—expands this node. Use the TreeListNode.HasChildren property to check if a node has child nodes that can be expanded or collapsed.
TreeListNode.Collapse—collapses this node.
The control’s BeforeExpand, AfterExpand, BeforeCollapse, and AfterCollapse events fire during expand and collapse operations. For example, you can handle the BeforeExpand event to dynamically create child nodes in unbound mode.
The code below collapses all tree list nodes.
treeList1.CollapseAll();
TreeList1.CollapseAll()
The following code snippets (auto-collected from DevExpress Examples) contain references to the CollapseAll() method.
Note
The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.
winforms-treelist-save-restore-expanded-state-of-nodes/CS/TreeListViewState.cs#L42
try {
TreeList.CollapseAll();
TreeListNode node;
winforms-richedit-document-api/CS/RichEditAPISample/Form1.cs#L379
ShowFirstExample("Range");
treeList1.CollapseAll();
}
winforms-treelist-save-restore-expanded-state-of-nodes/VB/TreeListViewState.vb#L46
Try
TreeList.CollapseAll()
Dim node As TreeListNode
winforms-richedit-document-api/VB/RichEditAPISample/Form1.vb#L385
ShowFirstExample("Range")
treeList1.CollapseAll()
End Sub
See Also