Error in Revit 2018 DWG Import

[AnatolyCEL]

Problem in Revit 2018. Document.Import Method (String, DWGImportOptions, View, ElementId)

Application imports DWG files to Revit that way:

            DWGImportOptions dWGImportOptions = new DWGImportOptions
            {
                ThisViewOnly = true,
                ColorMode = ImportColorMode.BlackAndWhite,
                VisibleLayersOnly = true,
                Unit = ImportUnit.Default,
                Placement = ImportPlacement.Origin,
                OrientToView = true
            };

next load Line Weights file:

IList<int> lineWeights = new List<int>();
                using (FileStream fileStream = new FileStream(lineWeightsPath,  FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
                using (StreamReader streamReader = new StreamReader(fileStream))
                {
                    string line;
                    while ((line = streamReader.ReadLine()) != null)
                    {
                        int intLine;
                        if (int.TryParse(line, out intLine))
                            lineWeights.Add(intLine);
                    }
                    streamReader.Close();
                }

dWGImportOptions.SetLineWeights(lineWeights);

loaded file is attached.

Finally Import:

document.Import(pathDWG, dWGImportOptions, viewPlan, out elementId)

In Revit 2015...2017 works fine, but the same code in Revit 2018 rise exception:

"The array of line weights is not valid; either it contains less than expected 255 values, or one or more values are out of range 1 to 16
Parameter name: options"

I reality array contains 255 values, all of them in range 1 to 16. If try import manually (in Revit user interface) using the same file, works fine.

Error happens when import by application doing.

[FAIR59]

in the while-loop you have to skip the lines starting with #

[AnatolyCEL]

if (int.TryParse(line, out intLine)) in my code. So line starting # is ignored. In addition, in debugger I watch resulted IList<int>, it's perfect

[FAIR59]

I tested the import and get the same result. But binairy speaking is 255 entries a strange value. So I added a extra item (1) to the list, and then the import was a success. So the question is, should you add an item at the beginning or at the end.

Revit 2016 also accepts a list of 256 entries.

[AnatolyCEL]

I hope it's temporary solution. If open this file by Revit user interface (Insert -> Import Line Weights) and just press OK, added before extra line ("1") is removed and import by application doesn't work again. This problem appears in Revit 2018 only! I think it's Error.

[FAIR59 · Accepted solution]

I agree it's an error.

please report https://forums.autodesk.com/t5/revit-api-forum/known-bug-list/td-p/7119126