TreeList.CollapseAll() Method

Collapses all the nodes in the Tree List.

Namespace: DevExpress.XtraTreeList

Assembly: DevExpress.XtraTreeList.v23.2.dll

NuGet Packages: DevExpress.Win.Navigation, DevExpress.Win.TreeList

Declaration

C#

public virtual void CollapseAll()

VB.NET

Public Overridable Sub CollapseAll

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.

C#

treeList1.CollapseAll();

VB.NET

TreeList1.CollapseAll()

Related GitHub Examples

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.

C#

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();
}

VB.NET

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#L376

    ShowFirstExample("Range")
    treeList1.CollapseAll()
End Sub