P

DimensionType.Prefix

Description:
The prefix text for the dimension value.

Remarks:
The text goes immediately before the value and is not overridden by the possible instance prefix.

public string Prefix { get; set; }

Public Property Prefix As String
Get
Set

public:
property String^ Prefix {
	String^ get ();
	void set (String^ value);
}

Autodesk.Revit.Exceptions.ArgumentNullException

When setting this property: A non-optional argument was null