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AddParameter Method (String, ForgeTypeId, ForgeTypeId, Boolean)

Family Manager Add Parameter(String, Forge Type Id, Forge Type Id, Boolean) Method

Add a new family parameter with a given name.

Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 25.0.0.0 (25.0.0.0)
Syntax 
public FamilyParameter AddParameter(
	string parameterName,
	ForgeTypeId groupTypeId,
	ForgeTypeId specTypeId,
	bool isInstance
)

Parameters

parameterName String
The name of the new family parameter.
groupTypeId ForgeTypeId
The identifier of the new family parameter's parameter group.
specTypeId ForgeTypeId
The type of new family parameter.
isInstance Boolean
Indicates if the new family parameter is instance or type.

Return Value

FamilyParameter
If creation was successful the new parameter is returned, otherwise an exception with failure information will be thrown.
Exceptions
Exception Condition
ArgumentNullException Thrown when the input argument-"parameterName"-is .
ArgumentException Thrown when the input argument-"parameterName"-is already in use, or when the input argument -"specTypeId" is an invalid type, or the input parameter group cannot be assigned to the new parameter.
InvalidOperationException Thrown when the family parameter creation failed. Or trying to add an instance parameter of image type.
Remarks
This method can work even without any family type, but it cannot be assigned the value via FamilyManager.Set methods when there is no current type. To add a parameter of family type use the AddParameter overload that accepts a category instead.
See Also