/// <summary>
/// Get the value of one of the element's parameters.
/// </summary>
/// <param name="parameterName">The name of the parameter whose value you want to obtain.</param>
/// <returns></returns>
public object GetParameterValueByName(string parameterName)
{
object result;
var param =
// We don't use Element.GetOrderedParameters(), it only returns ordered parameters
// as show in the UI
InternalElement.Parameters.Cast <Autodesk.Revit.DB.Parameter>()
// Element.Parameters returns a differently ordered list on every invocation.
// We must sort it to get sensible results.
.OrderBy(x => x.Id.IntegerValue)
.FirstOrDefault(x => x.Definition.Name == parameterName);
if (param == null || !param.HasValue)
{
return(string.Empty);
}
switch (param.StorageType)
{
case StorageType.ElementId:
int valueId = param.AsElementId().IntegerValue;
if (valueId > 0)
{
// When the element is obtained here, to convert it to our element wrapper, it
// need to be figured out whether this element is created by us. Here the existing
// element wrappers will be checked. If there is one, its property to specify
// whether it is created by us will be followed. If there is none, it means the
// element is not created by us.
var elem = ElementIDLifecycleManager <int> .GetInstance().GetFirstWrapper(valueId) as Element;
result = ElementSelector.ByElementId(valueId, elem == null ? true : elem.IsRevitOwned);
}
else
{
int paramId = param.Id.IntegerValue;
if (paramId == (int)BuiltInParameter.ELEM_CATEGORY_PARAM || paramId == (int)BuiltInParameter.ELEM_CATEGORY_PARAM_MT)
{
var categories = DocumentManager.Instance.CurrentDBDocument.Settings.Categories;
result = new Category(categories.get_Item((BuiltInCategory)valueId));
}
else
{
// For other cases, return a localized string
result = param.AsValueString();
}
}
break;
case StorageType.String:
result = param.AsString();
break;
case StorageType.Integer:
result = param.AsInteger();
break;
case StorageType.Double:
var paramType = param.Definition.ParameterType;
if (IsConvertableParameterType(paramType))
{
result = param.AsDouble() * UnitConverter.HostToDynamoFactor(
ParameterTypeToUnitType(paramType));
}
else
{
result = param.AsDouble();
}
break;
default:
throw new Exception(string.Format(Properties.Resources.ParameterWithoutStorageType, param));
}
return(result);
}
