Fast access of all elements in a drawing via .Net

EStein

Hi,
I'm trying to query all Elements of a drawing and check if their handles are saved in an external database. I've tried to simly iterrate over the AcadDocument.ModelSpace but only achieved a rate of around 100 elements per second, which is too slow. Is there an faster way to do it? I stumbled upon DatabaseServices and ApplicationServices but are to unexperienced in their usage. Any help is greatly appreciated!
I'm using C# and BricsCAD v.18.2.20 (x64) Revision 55961

public IEnumerable<string> GetAllSymbols()
{
    AcadDocument document = CADDocument;
    foreach (var obj in document.ModelSpace)
    {
        switch (obj)
        {
            case AcadBlockReference reference:
                yield return reference.Handle;
                break;
            /*
             ...
             */ 
        }
    }
}

Roy Klein Gebbinck

Are you perhaps accessing the external DB during the iteration?

Kerry Brown

I'd need to see what you are currently doing to comment. ( as will most people )
Are you comfortable using LINQ ?

EStein

@Kerry Brown said:
I'd need to see what you are currently doing to comment. ( as will most people )
Are you comfortable using LINQ ?

Yes I am very comfortable in C# but only have a very limited experience with BricsCAD. So LINQ is abolutly fine.

@Roy Klein Gebbinck said:
Are you perhaps accessing the external DB during the iteration?

No, right now I was only performance testing and didnt do anything else in the iterations.

Here is a rough sketch of my current code:

   public IEnumerable<string> GetAllSymbols()
    {
        AcadDocument document = CADDocument;
        foreach (var obj in document.ModelSpace)
        {
            switch (obj)
            {
                case AcadBlockReference reference:
                    yield return reference.Handle;
                    break;
                /*
                 ...
                 */ 
            }
        }
    }

Roy Klein Gebbinck

I can't comment on your code (I don't know C#).
FWIW: Using Lisp code, iterating over 100 object in MS takes 1.2 milliseconds (with FastCom switched off) on my machine.
FastCom is a feature of BricsCAD Lisp. With FastCom switched on the code is 5 times faster!

; (TestIterate nil 500)
(defun TestIterate (FastComOnP times / end ms ret sta)
  (vle-fastcom FastComOnP)
  (setq sta (getvar 'millisecs))
  (setq ms (vla-get-modelspace (vla-get-activedocument (vlax-get-acad-object))))
  (repeat times
    (setq ret nil)
    (vlax-for obj ms
      (if (= "AcDbBlockReference" (vla-get-objectname obj))
        (setq ret (cons (vla-get-handle obj) ret))
      )
    )
  )
  (setq end (getvar 'millisecs))
  (vle-fastcom T)
  (princ (strcat "\n\n" (itoa (vla-get-count ms)) " object processed "))
  (princ (strcat "\nProcess repeated " (itoa times) " times "))
  (princ (strcat "\nElapsed time in millisecs: " (itoa (- end sta))))
  (princ)
)

faceter

do you need all entities or only blocks?
try the editor selection
e.g.

           Editor editor = document.Editor;

            // Create a TypedValue array to define the filter criteria
            TypedValue[] typeValueArray = new TypedValue[2];
            typeValueArray.SetValue(new TypedValue((int)DxfCode.Start, "INSERT"), 0);
            typeValueArray.SetValue(new TypedValue((int)DxfCode.LayoutName, "Model"), 1);

            // Assign the filter criteria to a SelectionFilter object
            SelectionFilter selectionFilter = new SelectionFilter(typeValueArray);


            // Request for objects to be selected in the drawing area
            PromptSelectionResult pSelection;
            pSelection = editor.SelectAll(selectionFilter);

            // If the prompt status is OK, objects were selected
            if (PromptStatus.OK == pSelection.Status)
            {
                SelectionSet selectedEntities = pSelection.Value;
                ObjectId[] idArray = selectedEntities.GetObjectIds();
                DoSomething();
            }