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2021 Method
Changes 5
M

Document.NewFamilyInstance

Description:
Inserts a new instance of a family into the document, using a location, type/symbol and a base level.
Remarks:
This method is used to add a family instance that doesn't require a host element, but that can be associated to a level. If the instance fails to be created an exception may be thrown.

The type/symbol that is used must be loaded into the document before this method is called. Families and their symbols can be loaded using the Document.LoadFamily or Document.LoadFamilySymbol methods.

All levels within the document can be found by iterating over the entire document and searching for objects of type Autodesk.Revit.Elements.Level.

Some families, such as Beams, have more than one endpoint and are inserted in the same manner as single point instances. Once inserted these linear family instances can have their endpoints changed by using the instance's Element.Location property.

Note: if the created family instance includes nested instances, the API framework will automatically regenerate the document during this method call.

Overloads (3):
NewFamilyInstance(Curve,FamilySymbol,Level,StructuralType)
NewFamilyInstance(XYZ,FamilySymbol,Element,Level,StructuralType)
NewFamilyInstance(XYZ,FamilySymbol,Level,StructuralType) 
public FamilyInstance NewFamilyInstance(
	XYZ location,
	FamilySymbol symbol,
	Level level,
	StructuralType structuralType
)
Return Value nullNothingnullptr If creation was successful then an instance to the new object is returned, otherwise null Nothing nullptr a null reference ( Nothing in Visual Basic) . 
FamilyInstance CreateColumn(Autodesk.Revit.DB.Document document, Level level)
{
    // Get a Column type from Revit
    FilteredElementCollector collector = new FilteredElementCollector(document);
    collector.OfClass(typeof(FamilySymbol)).OfCategory(BuiltInCategory.OST_StructuralColumns);
    FamilySymbol columnType = collector.FirstElement() as FamilySymbol;

    FamilyInstance instance = null;
    if (null != columnType)
    {
        // Create a column at the origin
        XYZ origin = new XYZ(0, 0, 0);

        instance = document.Create.NewFamilyInstance(origin, columnType, level, StructuralType.Column);
    }

    return instance;
}