TopographySurface.MaterialId Property

The id of the material applied to this element.

Namespace: Autodesk.Revit.DB.Architecture
Assembly: RevitAPI (in RevitAPI.dll) Version: 26.1.0.0 (26.1.0.34)

Syntax

public ElementId MaterialId { get; set; }

Exception	Condition
ArgumentException	When setting this property: The materialId cannot map to a valid material element.
ArgumentNullException	When setting this property: A non-optional argument was null

This applies to TopographySurface and SiteSubRegion elements.