Selections Sets and Multileader Styles

[sonny3g]

Trying to get back into .NET programming and I need to be able to have a user select existing a mleader and based on the mleaderstyle.add it to a selection set in C#.  So far, I can find filter based on MLEADER, but I cannot figure out how to further filter by mleaderstyle. 

Can anyone help get me pointed in the right direction?

Thanks.

[_Tharwat]

Hi,

As far as I know, to get a selection set of Multileader style filtered is something that is not possible but to iterate through the selection set is the working process for this task I believe.

Good luck.

[sonny3g]

So, I cannot drill in and filter my selection set by multileader style.  However, as all of the multileaders I am going to work with MUST be located on a layer with a specific suffix I can further isolate the initial selection set to the specific multileaders I need.

The next issue is that I need to iterate through the selection set to make sure that it has MText.  If not, then go to the next item in the selection set.

If it does, then I need to read the first line of that MText content, get the layername, get the leader start and end points and create a new MultiLeader on a different layer with only the first line of text in the MText using a different Multileader style using the same start and end points.

I am struggling with how to drill into the object to first make sure it has MText and then to read the MText content.

All help is greatly appreciated.

[_Tharwat]

Hi,

Its been for a while since I have worked with C# but your aim of codes seems to be easy enough, so here is my attempt and basic codes for you to start with.

        public static void Test()
        {
            var doc = Application.DocumentManager.MdiActiveDocument;
            var db = doc.Database;
            var ed = doc.Editor;
            using (Transaction tr = db.TransactionManager.StartTransaction())
            {
                TypedValue[] tv = { new TypedValue(0, "MULTILEADER") };
                PromptSelectionResult sel = ed.GetSelection(new SelectionFilter(tv));
                if (sel.Status == PromptStatus.OK)
                {
                    foreach (ObjectId obj in sel.Value.GetObjectIds())
                    {
                        MLeader mld = (MLeader)tr.GetObject(obj, OpenMode.ForRead);
                        MLeaderStyle mls = (MLeaderStyle)tr.GetObject(mld.MLeaderStyle, OpenMode.ForRead);
                        if (mls.Name == "Test" && mld.MText.Contents.Contains("\\P"))
                        {
                            ed.WriteMessage("\nMleader style object <Test> was selected and its has more than one line of texts");
                        }
                    }
                }
                tr.Commit();
            }
        }

[sonny3g]

Thanks!! I am beginning to make some progress now.

[_Tharwat]

You are welcome.

Good luck.

[Juergen_Becker]

This.little code using LINQ for searching MTexts in a drawing, what goes realy fast (6MB Drawing under 1 second).

What you have to do is: Replace MText in MLeader.

You dont Need any foreach, which is slow.

http://drive-cad-with-code.blogspot.de/2011/04/tips-of-using-linq-in-autocad-net.html

http://spiderinnet1.typepad.com/blog/2012/04/use-linq-to-filter-entities-in-autocad-net.html

https://wtertinek.com/2015/05/31/linq-and-the-autocad-net-api-part-4/

http://through-the-interface.typepad.com/through_the_interface/2013/01/filtering-lists-of-autocad-en...

using (Transaction m_Tr = m_DataBase.TransactionManager.StartTransaction())
{
  BlockTable m_BlockTable = (BlockTable)m_Tr.GetObject(m_DataBase.BlockTableId, OpenMode.ForRead);
  BlockTableRecord m_BlockTableRecord = 
    (BlockTableRecord)m_Tr.GetObject(m_BlockTable[BlockTableRecord.ModelSpace], OpenMode.ForRead);

  var m_ObjectCollection = from m_ObjectId in m_BlockTableRecord.Cast<ObjectId>()
                           select new
                           {
                               m_DBObject = (DBObject)m_Tr.GetObject(m_ObjectId, OpenMode.ForRead, false)
                           };
                 
  IEnumerable<MText> m_dbMText = from m_OBJECT in m_ObjectCollection
                                 where (m_OBJECT.m_DBObject.GetType() == typeof(MText))
                                 select (MText)m_OBJECT.m_DBObject;

  m_dbMText = from m_Mtext in m_dbMText
              let Layer = m_ACADSettings.COSTextLayer
              where (m_Mtext.Layer == Layer)
              select (MText)m_Mtext;

  m_MTextList = m_dbMText.Cast<MText>().ToList();
  m_MTextList.ForEach(m_Text => m_ObjectIdList.Add(m_Text.ObjectId));
  m_Tr.Commit();
}

[_Tharwat]

Hi,

I guess you misunderstood what the OP wants.

They want to search for a specific Mleader Style Name and once found, then search its related Mtext string.

[Juergen_Becker]

No, I think, I don't misunderstand it.

What about this:

using (Transaction m_Tr = m_DataBase.TransactionManager.StartTransaction())
{
  BlockTable m_BlockTable = (BlockTable)m_Tr.GetObject(m_DataBase.BlockTableId, OpenMode.ForRead);
  BlockTableRecord m_BlockTableRecord =
      (BlockTableRecord)m_Tr.GetObject(m_BlockTable[BlockTableRecord.ModelSpace], OpenMode.ForRead);

  var m_ObjectCollection = from m_ObjectId in m_BlockTableRecord.Cast<ObjectId>()
                           select new
                           {
                               m_DBObject = (DBObject)m_Tr.GetObject(m_ObjectId, OpenMode.ForRead, false)
                           };

  IEnumerable<MLeader> m_dbMLeader = from m_OBJECT in m_ObjectCollection
                                     where (m_OBJECT.m_DBObject.GetType() == typeof(MLeader))
                                     select (MLeader)m_OBJECT.m_DBObject;

  m_dbMLeader = from m_MLeader in m_dbMLeader
                let StyleID = m_LeaderStyle.ObjectId
                where (m_MLeader.MLeaderStyle == StyleID)
                select (MLeader)m_MLeader;

  List<MLeader> m_MLeaderList = null;
  m_MLeaderList = m_dbMLeader.Cast<MLeader>().ToList();
  m_MLeaderList.ForEach(m_MLeader => m_ObjectIdList.Add(m_MLeader.ObjectId));
  m_Tr.Commit();
}

This code searching for MLeaders with specific Style.

m_dbMLeader = from m_MLeader in m_dbMLeader
                let StyleID = m_LeaderStyle.ObjectId
                where (m_MLeader.MLeaderStyle == StyleID)
                select (MLeader)m_MLeader;

First you have to define what Style you want (m_LeaderStyle). Please Change the Where-Condition according to your need (Text etc.)