Collapsing and Expanding All Nodes in SyntaxEditor

Updated on Mar 10, 2026

Environment

Product Version	Product	Author
2026.1.210	RadSyntaxEditor for WinForms	Nadya Karaivanova

Description

The following article demonstrates how to collapse and expand nodes programmatically in the SyntaxEditor component for UI for WinForms.

Solution

To collapse or expand all nodes in the SyntaxEditor, use the following code snippet. It iterates through the FoldingRegions and toggles their IsFolded property.

1. Access the SyntaxEditorElement.FoldingManager.FoldingRegions.
2. Loop through each FoldingRegion.
3. Toggle the IsFolded property.

Here is the example code:

C#

private void radButton1_Click(object sender, EventArgs e)
{
    // Collapse/Expand all nodes
    foreach (FoldingRegion region in this.radSyntaxEditor1.SyntaxEditorElement.FoldingManager.FoldingRegions)
    {
        region.IsFolded = !region.IsFolded;
    }
}

See Also

• SyntaxEditor Overview