MLeader may throw eInvalidContext exception

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2 responses to “MLeader may throw eInvalidContext exception”

1. 

   Gofatw

   January 16, 2020

   We are using C# and this is starting to popup in the last few months. Has something changed in the API to cause this? Assigning the block contents after the assigning AddLeaderLine and AddFirstVertext and/or LastVertex no longer seems to help.
   Anything else to help fix this?

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2. 

   Madhukar Moogala

   January 21, 2020

   Tried this code, I’m able to attach Block Content to MLeader correctly, may I know the problem you are facing ?
   
public static void BlockMLeader()
{
Document doc = Application.DocumentManager.MdiActiveDocument;
Database db = doc.Database;
Editor ed = doc.Editor;
using (Transaction Tx = db.TransactionManager.StartTransaction())
{
BlockTable table = Tx.GetObject(db.BlockTableId, OpenMode.ForRead) as BlockTable;
BlockTableRecord model = Tx.GetObject(table[BlockTableRecord.ModelSpace], OpenMode.ForWrite)
as BlockTableRecord;
if (!table.Has("BlkLeader"))
{
ed.WriteMessage("\nYou need to define a \"BlkLeader\" first...");
return;
}
MLeader leader = new MLeader();
leader.SetDatabaseDefaults();
leader.ContentType = ContentType.BlockContent;
leader.BlockContentId = table["BlkLeader"];
leader.BlockPosition = new Point3d(4, 2, 0);
int idx = leader.AddLeaderLine(new Point3d(1, 1, 0));
leader.AddFirstVertex(idx, new Point3d(0, 0, 0));
int AttNumber = 0;
BlockTableRecord blkLeader = Tx.GetObject(leader.BlockContentId, OpenMode.ForRead)
as BlockTableRecord;
Matrix3d Transfo = Matrix3d.Displacement(leader.BlockPosition.GetAsVector());
foreach (ObjectId blkEntId in blkLeader)
{
AttributeDefinition AttributeDef = Tx.GetObject(blkEntId, OpenMode.ForRead)
as AttributeDefinition;
if (AttributeDef != null)
{
AttributeReference AttributeRef = new AttributeReference();
AttributeRef.SetAttributeFromBlock(AttributeDef, Transfo);
AttributeRef.Position = AttributeDef.Position.TransformBy(Transfo);
AttributeRef.TextString = "Attrib #" + (++AttNumber);
leader.SetBlockAttribute(blkEntId, AttributeRef);
}
}
model.AppendEntity(leader);
Tx.AddNewlyCreatedDBObject(leader, true);
Tx.Commit();
}
}


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