API CANTCurves & CANTCriticalStation

[gabriel_sit]

I cant access CANTCurves in an Alignment. I get messages like : "Alignment cannot be opened for write successfully."

When I try : "trans.GetObject(al.ObjectId, _AcDb.OpenMode.ForWrite)" I get "Autodesk.AutoCAD.Runtime.Exception: eLockViolation"

When I try :"myAlignment.UpgradeOpen()" I get "eInvalidOpenState"

How can I access cant informations of an alignment?

public ArrayList TEST_cant(Alignment al)
{

   ArrayList lstTest = new ArrayList();

   _AcAp.Document doc = _AcAp.Application.DocumentManager.MdiActiveDocument;
   _AcDb.Database db = doc.Database;

   using (_AcDb.Transaction trans = db.TransactionManager.StartTransaction())
   {
      //Alignment al_bis = trans.GetObject(al.ObjectId, _AcDb.OpenMode.ForWrite) as _AcCDb::Alignment;

//Autodesk.AutoCAD.Runtime.Exception: eLockViolation

      ArrayList lstStations = GetStartStations(al);

      al.UpgradeOpen(); // eInvalidOpenState
      CANTCurveCollection cantCurveCollection = al.CANTCurves; //Alignment cannot be opened for write successfully.
      MessageBox.Show("CANTcurveCollection retrived");

      foreach (CANTCurve CANTcurve in cantCurveCollection)
      {
         lstTest.Add("CANTcurve");

         lstTest.Add(CANTcurve.StartStation);

         MessageBox.Show(CANTcurve.Name);

         foreach (CANTCriticalStation CANTcrtclStn in CANTcurve.CANTCriticalStations)
         {
             lstTest.Add("CANTcrtclSTN");

             lstTest.Add(CANTcrtclStn.CANTCurveName);
             MessageBox.Show(CANTcrtclStn.CANTCurveName);
         }

         lstTest.Add("CANTcurve");

         }
      al.Update();
      trans.Commit();
   }
   return lstTest;
}

[ActivistInvestor]

Is your code being run from a command method, or from a button click handler on a dialog, palette, or other UI?

The problem is most likely that you are running your code from the latter, and you are not locking the document before trying to access it. 

Document doc = Application.DocumentManager.MdiActiveDocument
using(doc.LockDocument())
{
  // Ok to access document contents here
}

[gabriel_sit]

Hi,

My code is run from a command method that opens a windows form from which I can select an alignment and a method. I do this to test methods that takes an alignment as argument and check if they are working.

A lot of them are working fine like :

public ArrayList GetEntities(Alignment al)
{
   ArrayList lstEntity = new ArrayList();

   foreach (_AcCDb::AlignmentEntity entity in al.Entities)
      {
      lstEntity.Add(entity);
      }
   return lstEntity;
}

I tried a bit messing around with : 

using(doc.LockDocument())

but I get the same errors.

[ActivistInvestor]

You don't mention how the Windows Form is shown. It can be shown as a modal window or a modeless window. Also as far as your attempts to use the lock document code you need to show the entire code not just one line. 

[gabriel_sit]

Hi,

I think I have modeless forms as I am able to draw in the model space.

As for the document locking I tried, 2 position of "using (doc.LockDocument())" inside the method to get ant information, each time I tried with or without ".UpgradeOpen()".

public ArrayList TEST_cant_CANTCurve(Alignment al)               //not ok
{
    ArrayList lstTest = new ArrayList();
    ArrayList lstStations = GetStartStations(al);

    _AcAp.Document doc = _AcAp.Application.DocumentManager.MdiActiveDocument;
   
    using (doc.LockDocument()) ;
    {
        _AcDb.Database db = doc.Database;

        using (_AcDb.Transaction trans = db.TransactionManager.StartTransaction())
        {
            //using (doc.LockDocument()) ;

            //al.UpgradeOpen();                                                                                    //Autodesk.AutoCAD.Runtime.Exception: eInvalidOpenState


            CANTCurveCollection cantCurveCollection = al.CANTCurves;                                             //Alignment cannot be opened for write successfully.
            MessageBox.Show("CANTcurveCollection retrived");