The TakeoffFitting I create via Revit API replaced by revit in background？why？

[Anonymous]

I use the code below to creat takeofffiting between connector and pipe:

    foreach (var v in toConnects)
                {
                    ElementId tempTypeId = Util.GetPipeType(doc, v.ConType);//PipetypeId
                    ElementId zhiTypeId = v.Connector.Owner.GetTypeId();
                    Pipe ppp = v.Connector.Owner as Pipe;
                    v.Connector.Owner.ChangeTypeId(tempTypeId);
                    zhu.ChangeTypeId(tempTypeId);
                    FamilyInstance takeofff = doc.Create.NewTakeoffFitting(v.Connector, zhu);
                    sb_aaa.Append(takeofff.Id.ToString() + ",");
                    string s = takeofff.Symbol.Family.Name;
                    sb2.Append(takeofff.Id.ToString() + ":" + s+"\n");
                    doc.Regenerate();
            
                    ppp.ChangeTypeId(zhiTypeId);
                }

the variable "sb_aaa" is used to record the elementid I created.

The firist line of the  picture below is record of elementid I created; I use the "select by ID" command in Revit and paste the first line ，it shows me like the second picture. It seems tha all the element I created is deleted by Revit .

How can I avoid this?

 

[Anonymous]

help me !

[FAIR59]

As the instances get created, the fault should be in the next ( bit of ) code. So without extra information I can only make some (trivial) guesses.

• have you committed the transaction ?
• have you assimilated the transactiongroup ?
• do you have an handled exception,  (try / catch code)  that contains the transaction?
• if it's an ExternalCommand:  did you finish with Result.Succeeded ?