TreeList.CollapseAll() Method
Collapses all the nodes in the Tree List.
Namespace: DevExpress.XtraTreeList
Assembly: DevExpress.XtraTreeList.v22.2.dll
NuGet Package: DevExpress.Win.TreeList
Declaration
Remarks
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.
You can also use the TreeListNode.Expanded property to obtain or set whether a node is 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.
Example
The code below collapses all tree list nodes.