topic Re: Monitoring parameter changes using DMU mechanism in Revit API Forum

Monitoring parameter changes using DMU mechanism

846081597 — Thu, 17 Feb 2022 07:17:45 GMT

Hello everyone

I have encountered some problems recently.

I created some family parameters and displayed them in Revit's properties window

using (Transaction trans = new Transaction(doc))
{
trans.Start("Add Parameter");
familyMgr = doc.FamilyManager;
BuiltInParameterGroup paraGroup = BuiltInParameterGroup.PG_TEXT;
ParameterType paraType = ParameterType.Text;
bool isInstance = false;
paramAdded = familyMgr.AddParameter(paraName, paraGroup, paraType, isInstance);

string value = Paras[key];
familyMgr.Set(paramAdded, value);

trans.Commit();
}

Now I want to implement some functions: if someone modifies the parameter value I defined in the properties window, I can quickly capture this operation and obtain the modified value.

I consider using DMU to realize this function, but I have no way to start. Can you give me some ideas.

thank you

Re: Monitoring parameter changes using DMU mechanism

jeremy_tammik — Thu, 17 Feb 2022 08:48:38 GMT

Yes, DMU is a viable option. Read about it here:

https://thebuildingcoder.typepad.com/blog/about-the-author.html#5.31

Re: Monitoring parameter changes using DMU mechanism

846081597 — Fri, 18 Feb 2022 02:20:43 GMT

Hi jeremy,

Thank you for your help.

When I added a trigger, I encountered two problems

 UpdaterRegistry.AddTrigger(
      updater.GetUpdaterId(), ElementFilter,
      Element.GetChangeTypeParameter(ElementId) );

First, I won't write ElementFilter for all family parameters in the current document.

Second, Element.GetChangeTypeParameter need an ID, but I don't know which family parameter the user will modify. I can't determine which ID it is.

Please help me

Thanks

Re: Monitoring parameter changes using DMU mechanism

jeremy_tammik — Fri, 18 Feb 2022 08:13:42 GMT

You can subscribe to all changes instead of parameter changes only. Try it out with any subset of elements you want first. You can expand it later, once you have it working at all.

Re: Monitoring parameter changes using DMU mechanism

846081597 — Tue, 01 Mar 2022 08:21:15 GMT

Hello jeremy

Thanks for your help

I wrote a section of parameter trigger based on the information you gave me

However, I did not trigger the parameter trigger after modifying the family parameters in the family document.

Can you help me find the reason。

public class ParameterUpdater : IUpdater
{
internal ParameterUpdater(AddInId addinID)
{
m_updaterId = new UpdaterId(addinID, new Guid("FBF3F6B2-4C06-42d4-97C1-D1B4EB593EFF"));
}

internal void Register(Document doc)
{
if (!UpdaterRegistry.IsUpdaterRegistered(m_updaterId))
UpdaterRegistry.RegisterUpdater(this, doc);
}

internal void AddTriggerForUpdater(Document doc, List<ElementId> idsToWatch)
{
if (idsToWatch.Count == 0)
return;

UpdaterRegistry.AddTrigger(m_updaterId, doc, idsToWatch, Element.GetChangeTypeAny());
}
public void Execute(UpdaterData data)
{
MessageBox.Show("enter change");

return;
}

public UpdaterId GetUpdaterId()
{
return m_updaterId;
}

public string GetUpdaterName()
{
return "Parameter Updater";
}

public string GetAdditionalInformation()
{
return "Automatically add a family parameter";
}

public ChangePriority GetChangePriority()
{
return ChangePriority.Structure;
}

private UpdaterId m_updaterId = null;
}

[Autodesk.Revit.Attributes.Transaction(Autodesk.Revit.Attributes.TransactionMode.Manual)]
public class Command : IExternalCommand
{
public Document doc;
public Autodesk.Revit.ApplicationServices.Application app;
private static List<ElementId> idsToWatch = new List<ElementId>();
private static ParameterUpdater m_parameterUpdater = null;
private AddInId m_thisAppId;

public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)
{
doc = commandData.Application.ActiveUIDocument.Document;

m_thisAppId = commandData.Application.ActiveAddInId;//MessageBox.Show(m_thisAppId.GetGUID().ToString());
if (m_parameterUpdater == null)
{
using (Transaction tran = new Transaction(doc, "Register Section Updater"))
{
tran.Start();
m_parameterUpdater = new ParameterUpdater(m_thisAppId);
m_parameterUpdater.Register(doc);

tran.Commit();
}
}
FamilyParameterSet parameters = doc.FamilyManager.Parameters;
foreach(FamilyParameter para in parameters)
{
idsToWatch.Add(para.Id); //MessageBox.Show(para.Definition.Name);
}

UpdaterRegistry.RemoveAllTriggers(m_parameterUpdater.GetUpdaterId());
m_parameterUpdater.AddTriggerForUpdater(doc, idsToWatch);

doc.DocumentClosing += UnregisterSectionUpdaterOnClose;

return Result.Succeeded;

}

Re: Monitoring parameter changes using DMU mechanism

Kennan.Chen — Tue, 01 Mar 2022 10:11:15 GMT

How about watching the Document.OwnerFamily?

Re: Monitoring parameter changes using DMU mechanism

846081597 — Wed, 02 Mar 2022 02:38:17 GMT

Hello Kennan.Chen

Sorry, I'm a novice in secondary development. I don't know how to use Document.OwnerFamily.

I mainly want to capture the user's modification of family parameters. I defined several family parameters with the revit api interface. If the user can modify the family parameters I defined, I can capture this operation and obtain the modified values.

When I modified the family parameters, I found that the program did not enter the execute function of ParameterUpdate at all.

ParameterUpdater.AddTrigger(m_updaterId,doc, List<ElementId>,Element.GetChangeTypeAny())

Re: Monitoring parameter changes using DMU mechanism

Kennan.Chen — Wed, 02 Mar 2022 03:16:48 GMT

In your code, you collected all the FamilyParameter ids and ask the DMU to watch modifications on them, which actually didn't work.

Maybe you can give DMU the id of Document.OwnerFamily. I have no idea if it will work. You can have a try.

Re: Monitoring parameter changes using DMU mechanism

846081597 — Thu, 03 Mar 2022 03:02:57 GMT

Hello Kennan.Chen

Thank you for your help. I've tried and still can't. now I doubt whether DMU can't be used for family parameters at all,I really can't find anything wrong.

Re: Monitoring parameter changes using DMU mechanism

846081597 — Fri, 04 Mar 2022 08:46:28 GMT

I tried to use controlledapplication_ Documentchanged has succeeded. Thank you