MLeader.SetDogleg
This is your original code just hard-coded for an example.
Modified 2 lines in code that end with---//////////GET INDEX
Added 2 lines that end with----/////////USE SETDOGLOG
[CommandMethod("TestMLeader", "TestMLeader", "TestMLeader", CommandFlags.Modal)]
public void TestMLeader()
{
Document acadDocument = Application.DocumentManager.MdiActiveDocument;
using (Transaction trans = acadDocument.TransactionManager.StartTransaction())
{
BlockTable acadBlockTable = (BlockTable)trans.GetObject(acadDocument.Database.BlockTableId, OpenMode.ForRead);
BlockTableRecord modelSpace = (BlockTableRecord)trans.GetObject(acadBlockTable[BlockTableRecord.ModelSpace], OpenMode.ForWrite);
//Leader to the right.
MLeader leader1 = new MLeader();
int leader1index = leader1.AddLeader();//////////GET INDEX
leader1.AddLeaderLine(0);
leader1.AddFirstVertex(0, new Point3d(0.0, 0.0, 0.0));
leader1.AddLastVertex(0, new Point3d(2.0, -2.0, 0.0));
leader1.SetDatabaseDefaults();
leader1.TextAttachmentDirection = TextAttachmentDirection.AttachmentHorizontal;
leader1.TextAngleType = TextAngleType.HorizontalAngle;
leader1.TextAlignmentType = TextAlignmentType.LeftAlignment;
leader1.TextAttachmentType = TextAttachmentType.AttachmentMiddleOfTop;
MText mText1 = new MText();
mText1.SetDatabaseDefaults();
mText1.Contents = "Text\\PText\\PText";
leader1.MText = mText1;
leader1.SetDogleg(leader1index, Vector3d.XAxis);/////////USE SETDOGLOG
modelSpace.AppendEntity(leader1);
trans.AddNewlyCreatedDBObject(leader1, true);
//Leader to the left.
MLeader leader2 = new MLeader();
int leader2index = leader2.AddLeader();//////////GET INDEX
leader2.AddLeaderLine(0);
leader2.AddFirstVertex(0, new Point3d(0.0, 0.0, 0.0));
leader2.AddLastVertex(0, new Point3d(-2.0, -2.0, 0.0));
leader2.SetDatabaseDefaults();
leader2.TextAttachmentDirection = TextAttachmentDirection.AttachmentHorizontal;
leader2.TextAngleType = TextAngleType.HorizontalAngle;
leader2.TextAlignmentType = TextAlignmentType.RightAlignment;
leader2.TextAttachmentType = TextAttachmentType.AttachmentMiddleOfBottom;
MText mText2 = new MText();
mText2.SetDatabaseDefaults();
mText2.Contents = "Text\\PText\\PText";
leader2.MText = mText1;
leader2.SetDogleg(leader2index, Vector3d.XAxis.MultiplyBy(-1));/////////USE SETDOGLOG
modelSpace.AppendEntity(leader2);
trans.AddNewlyCreatedDBObject(leader2, true);
trans.Commit();
}
}