Get Pipe Segment parameter and compare it to Project Pipe Segment

[Anonymous]

I'm trying to use the API to iterate through all the pipes in the model and tally the total length of different pipe sizes. I found some sample code here (http://help.autodesk.com/view/RVT/2014/ESP/?guid=GUID-B9C38F9B-A11B-4369-B879-0A641A3E725F) which reports the various pipe sizes for each Pipe Segment. I'm trying to add simple Total Length tallying piece to this to prove my concept but I am having trouble matching up the Pipe Segment Name from each pipe and the Segment.Name from the Global Pipe Segments. Here is my code:

BuiltInParameter pipeSegmentParam = BuiltInParameter.RBS_PIPE_SEGMENT_PARAM;
BuiltInParameter pipeLengthParam = BuiltInParameter.INSTANCE_LENGTH_PARAM;

// Get all pipes in the project
FilteredElementCollector collectorPipes = new FilteredElementCollector(doc);
collectorPipes.OfClass(typeof(Autodesk.Revit.DB.Plumbing.Pipe));
IEnumerable<Pipe> pipes = collectorPipes.ToElements().Cast<Pipe>();


FilteredElementCollector collectorPipeType = new FilteredElementCollector(doc);
collectorPipeType.OfClass(typeof(Segment));

IEnumerable<Segment> segments = collectorPipeType.ToElements().Cast<Segment>();
foreach (Segment segment in segments)
{
    StringBuilder strPipeInfo = new StringBuilder();
    strPipeInfo.AppendLine("Segment: " + segment.Name);

    strPipeInfo.AppendLine("Roughness: " + segment.Roughness);

    strPipeInfo.AppendLine("Pipe Sizes:");
    double dLengthFac = 12;  // used to convert stored units, 304.8 for Imperial to Metric, 12 for Imperial
    foreach (MEPSize size in segment.GetSizes())
    {
         double totalLength = 0.0;
         foreach (Pipe pipe in pipes)
         {
              Parameter pipeSegment = pipe.get_Parameter(pipeSegmentParam);
              double pipeSize = pipe.Diameter;
              if (pipeSegment.AsString() == segment.Name.ToString())
              {
                   if (pipeSize == size.NominalDiameter)
                   {
                         totalLength = totalLength + pipe.get_Parameter(pipeLengthParam).AsDouble();
                   }
              }
         }
         strPipeInfo.AppendLine(string.Format("Nominal: {0:F3}, ID: {1:F3}, OD: {2:F3}",
              size.NominalDiameter * dLengthFac, size.InnerDiameter * dLengthFac, size.OuterDiameter * dLengthFac));
         strPipeInfo.AppendLine(string.Format("Total Length: {0:F3}",
                                                totalLength));
     }

     TaskDialog.Show("PipeSetting Data", strPipeInfo.ToString());
     break;
}

When I run this, I get zero length for all pipe sizes in the dialog window even though I know I have pipes in the model with the corresponding pipe type. When I debug and inspect the values, I notice that the variable pipeSegment has a whole bunch of values but none of which appear to match the built in parameter RBS_PIPE_SEGMENT_PARAM that I am trying to get. This appears to cause my first if statement to always be false. So how do you find the Pipe Segment property on a pipe to compare it to the Pipe Segment names in the project? Or is there a better way to solve this?

[Anonymous · Accepted solution]

I think I figured it out on my own. I found that if I retrieved the ElementId of the segment and compared it to the ElementId of the pipeSegment parameter, it seems to work. I also had to change the Built in parameter that reads the Pipe length to CURVE_ELEM_LENGTH.

Here is the tweaked section in my second foreach statement:

Parameter pipeSegment = pipe.get_Parameter(pipeSegmentParam);
ElementId segmentSchTypeId = segment.Id;
ElementId pipeSegmentTypeId = pipeSegment.AsElementId();

double pipeSize = pipe.Diameter;
if (pipeSegmentTypeId == segmentSchTypeId)
{
    if (pipeSize == size.NominalDiameter)
    {
        totalLength = totalLength + pipe.get_Parameter(pipeLengthParam).AsDouble();
    }
}