This post is about how you can clean up the unnecessary lines styles from the document by using IronPython in Revit Dynamo Application. And the idea is if the given keyword contains in line style’s name, the line style element will be removed from the document.

First import these modules: clr to load .Net Assemblies as IronPython modules which are RevitAPI.dll and RevitServices.dll and from these modules we import DB, DocumentManager and TransactionManager classes. Collect the current document and store in doc. Get Line category object from Category object by using GetCategory method.

# dynamo version - 1.3.3
import clr
clr.AddReference("RevitAPI")
clr.AddReference("RevitServices")

from Autodesk.Revit.DB import *
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager

# current document
doc = DocumentManager.Instance.CurrentDBDocument
# line category object
cate = Category.GetCategory(doc, BuiltInCategory.OST_Lines)

Create a dictionary to store Line Style’s Element Id and Name, keywords input can be single or multiple and removed will be the output (line style names).

# name and id pairs
nameIdDict = {}
# keyword - string
keywords = [IN[0]] if not isinstance(IN[0], list) else IN[0]
# output (removed lines names)
removed = []
# each line from line category
for i in cate.SubCategories:
# each word in keywords
for k in keywords:
# keyword in line name
if k in i.Name:
# store in dictionary
nameIdDict[i.Name] = i.Id

# start transaction
TransactionManager.Instance.EnsureInTransaction(doc)
# each name, id in dictionary
for name, id in nameIdDict.items():
# add to output result
removed.append(name)
# delete from the document
doc.Delete(id)

# transaction done
TransactionManager.Instance.TransactionTaskDone()

# output result
OUT = removed

Start transaction to make the changes. Line style’s Name to add to the output list and Id to use in Delete method. And finally, close the transaction.

Sample usage and the complete code as below:

# dynamo version - 1.3.3
import clr
clr.AddReference("RevitAPI")
clr.AddReference("RevitServices")

from Autodesk.Revit.DB import *
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager

# current document
doc = DocumentManager.Instance.CurrentDBDocument
# line category object
cate = Category.GetCategory(doc, BuiltInCategory.OST_Lines)
# name and id pairs
nameIdDict = {}
# keyword - string
keywords = [IN[0]] if not isinstance(IN[0], list) else IN[0]
# output (removed lines names)
removed = []
# each line from line category
for i in cate.SubCategories:
# each word in keywords
for k in keywords:
# keyword in line name
if k in i.Name:
# store in dictionary
nameIdDict[i.Name] = i.Id

# start transaction
TransactionManager.Instance.EnsureInTransaction(doc)
# each name, id in dictionary
for name, id in nameIdDict.items():
# add to output result
removed.append(name)
# delete from the document
doc.Delete(id)

# transaction done
TransactionManager.Instance.TransactionTaskDone()

# output result
OUT = removed