TreeList.InvalidateNodes() Method

Invalidates all visible nodes and row footers.

Assembly : DevExpress.XtraTreeList.v25.2.dll

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

Declaration

C#
VB.NET

csharp

public virtual void InvalidateNodes()

Public Overridable Sub InvalidateNodes

Remarks

Use the InvalidateNodes method to force repainting of all nodes and row footers currently visible within the TreeList control. Note that nodes include cells, preview sections, node images, expand/collapse buttons and indicator cell buttons. Row footers include indicator cells as well.

Calling the InvalidateNodes method is useful if you want to repaint the mentioned elements at times when not repainted automatically. For instance, navigating through cells doesn’t invoke row footer repainting. Thus, you must invoke row footer repainting manually if you want their look & feel to depend on specific conditions.

Generally, the following must be done in order to use the InvalidateNodes method effectively.

Write either a TreeList.CustomDrawNodeButton, TreeList.CustomDrawNodeCell, TreeList.CustomDrawNodeImages, TreeList.CustomDrawNodeIndicator, TreeList.CustomDrawNodePreview, TreeList.CustomDrawRowFooter or TreeList.CustomDrawRowFooterCell event handler. This enables you to custom paint elements affected by the InvalidateNodes method.
Call the InvalidateNodes method when changes requiring to repaint these elements have been performed (if these elements are not repainted automatically).

The TreeList.InvalidateNode method enables you to repaint a single node.