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SetUnderlayRange Method

Sets the underlay base and underlay top to the specified levels.

Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 17.0.0.0 (17.0.484.0)
Since: 2017

Syntax

C# 
public void SetUnderlayRange(
	ElementId baseLevelId,
	ElementId topLevelId
)
Visual Basic 
Public Sub SetUnderlayRange ( _
	baseLevelId As ElementId, _
	topLevelId As ElementId _
)
Visual C++ 
public:
void SetUnderlayRange(
	ElementId^ baseLevelId, 
	ElementId^ topLevelId
)

Parameters

baseLevelId
Type: Autodesk.Revit.DB ElementId
The element id of a level in the project or InvalidElementId. If InvalidElementId, then the underlay base level is not set and no elements will be displayed as underlay.
topLevelId
Type: Autodesk.Revit.DB ElementId
The element id of a level in the project or InvalidElementId. If InvalidElementId, then the underlay range is unbounded.

Exceptions

Exception Condition
Autodesk.Revit.Exceptions ArgumentException The ElementId baseLevelId does not correspond to a Level in the project. -or- The ElementId topLevelId does not correspond to a Level in the project. -or- The elevation of level topLevelId must be greater than the elevation of level baseLevelId.
Autodesk.Revit.Exceptions ArgumentNullException A non-optional argument was NULL

See Also