public QLMepSystemResolve(MEPSystem _mepSystem)
{
id = _mepSystem.Id.ToString();
name = _mepSystem.Name;
mepDomain = GetMepDomain(_mepSystem).ToString();
//https://thebuildingcoder.typepad.com/blog/2016/06/traversing-and-exporting-all-mep-system-graphs.html
// to travers mep system from the root
FamilyInstance root = _mepSystem.BaseEquipment;
if (root != null && (_mepSystem.GetType() == typeof(MechanicalSystem)))
{
// Traverse the system and dump the
// traversal graph into an XML file
TraversalTree tree = new TraversalTree(_mepSystem);
if (tree.Traverse())
{
qlTammTreeNode = new QLTammTreeNodeResolve(JsonSerializer.Deserialize <JsonElement>(tree.DumpToJsonTopDown()));
}
}
}
/// <summary>
/// Implement this method as an external command for Revit.
/// </summary>
/// <param name="commandData">An object that is passed to the external application
/// which contains data related to the command,
/// such as the application object and active view.</param>
/// <param name="message">A message that can be set by the external application
/// which will be displayed if a failure or cancellation is returned by
/// the external command.</param>
/// <param name="elements">A set of elements to which the external application
/// can add elements that are to be highlighted in case of failure or cancellation.</param>
/// <returns>Return the status of the external command.
/// A result of Succeeded means that the API external method functioned as expected.
/// Cancelled can be used to signify that the user cancelled the external operation
/// at some point. Failure should be returned if the application is unable to proceed with
/// the operation.</returns>
public virtual Autodesk.Revit.UI.Result Execute(ExternalCommandData commandData
, ref string message, Autodesk.Revit.DB.ElementSet elements)
{
try
{
// Verify if the active document is null
UIDocument activeDoc = commandData.Application.ActiveUIDocument;
if (activeDoc == null)
{
MessageBox.Show("There's no active document in Revit.", "No Active Document",
MessageBoxButtons.OK, MessageBoxIcon.Warning);
return Autodesk.Revit.UI.Result.Failed;
}
// Verify the number of selected elements
SelElementSet selElements = activeDoc.Selection.Elements;
if (selElements.Size != 1)
{
message = "Please select ONLY one element from current project.";
return Autodesk.Revit.UI.Result.Failed;
}
// Get the selected element
Element selectedElement = null;
foreach (Element element in selElements)
{
selectedElement = element;
break;
}
// Get the expected mechanical or piping system from selected element
// Some elements in a non-well-connected system may get lost when traversing
//the system in the direction of flow; and
// flow direction of elements in a non-well-connected system may not be right,
// therefore the sample will only support well-connected system.
MEPSystem system = ExtractMechanicalOrPipingSystem(selectedElement);
if (system == null)
{
message = "The selected element does not belong to any well-connected mechanical or piping system. " +
"The sample will not support well-connected systems for the following reasons: " +
Environment.NewLine +
"- Some elements in a non-well-connected system may get lost when traversing the system in the " +
"direction of flow" + Environment.NewLine +
"- Flow direction of elements in a non-well-connected system may not be right";
return Autodesk.Revit.UI.Result.Failed;
}
// Traverse the system and dump the traversal into an XML file
TraversalTree tree = new TraversalTree(activeDoc.Document, system);
tree.Traverse();
String fileName;
fileName = Path.Combine(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location), "traversal.xml");
tree.DumpIntoXML(fileName);
return Autodesk.Revit.UI.Result.Succeeded;
}
catch (Exception ex)
{
message = ex.Message;
return Autodesk.Revit.UI.Result.Failed;
}
}