多重延伸

[CommandMethod("ext")]
public void  ext1()
{
 var doc = acAp.Document.Manager.MdiActiveDocument();
var db = doc.database;
var ed = ed.editor;
var ss = ed.getSelection();
If(ss.status!=prompt.status.OK) return;
var psr = ss.value
var points = new point3dCollection();
Using(var tr= db.transactionManager.StartTransaction())
{
For(i =0;i 0.80) continue;
     bool fd = po.getdistanceTo(cr1.StartPoint)<po.getdistanceTo(cr1.endpoint);
    cr1.Extend(fd,po);
    }
}
tr.commit();
}
}