Here is some handy code for those of you working with the .Net associative API. The C# sample below illustrates how to dump all dimensional constraints in the current space. It also shows how to dig from the constraint objects down to the dependent entities and the controlling associative parameter.
/////////////////////////////////////////////////////////////
// Use: Dumps to command line the dimensional constraints
// in current BlockTableRecord
// Lists constraint type, dependent entity and
// controlling parameter.
//
// Author: Philippe Leefsma.
/////////////////////////////////////////////////////////////
[CommandMethod("DumpDimConstraints")]
public void DumpDimConstraints()
{
Document doc = Application.DocumentManager.MdiActiveDocument;
Database db = doc.Database;
Editor ed = doc.Editor;
ObjectId networkId = AssocNetwork.GetInstanceFromObject(
db.CurrentSpaceId,
false,
true,
"ACAD_ASSOCNETWORK");
if (networkId == ObjectId.Null)
return;
using (Transaction Tx =
db.TransactionManager.StartTransaction())
{
using (AssocNetwork network =
Tx.GetObject(
networkId,
OpenMode.ForRead, false) as AssocNetwork)
{
foreach (ObjectId actionId in network.GetActions)
{
if (actionId == ObjectId.Null)
continue;
DBObject obj = Tx.GetObject(
actionId,
OpenMode.ForRead);
if (actionId.ObjectClass.IsDerivedFrom(
RXObject.GetClass(
typeof(Assoc2dConstraintGroup))))
{
Assoc2dConstraintGroup group = obj
as Assoc2dConstraintGroup;
foreach(GeometricalConstraint constraint
in group.Constraints)
{
if(constraint.GetRXClass().IsDerivedFrom(
RXObject.GetClass(
typeof(ExplicitConstraint))))
DumpDimConstraint(Tx, constraint
as ExplicitConstraint);
}
}
}
}
}
}
void DumpDimConstraint(
Transaction Tx,
ExplicitConstraint constraint)
{
Document doc = Application.DocumentManager.MdiActiveDocument;
Editor ed = doc.Editor;
ed.WriteMessage("\n —- Dimensional Constraint —- ");
ed.WriteMessage("\n – Constraint type: " +
constraint.ToString().Remove(0, 34));
//1- Dump Constrained geometry
//-> Gives access to constrained Entity
DumpConstrainedGeometry(Tx, constraint.ConnectedGeometries);
//2- Dump AssocDependency
//-> Gives access to Dimension Entity
AssocDependency dep = Tx.GetObject(
constraint.DimDependencyId,
OpenMode.ForRead)
as AssocDependency;
Dimension depDim = Tx.GetObject(
dep.DependentOnObject,
OpenMode.ForRead)
as Dimension;
ed.WriteMessage("\n – Dependent dimension entity: " +
depDim.ToString().Remove(0, 34));
//3- Dump AssocValueDependency
//-> Gives access to AssocVariable
AssocValueDependency valueDep = Tx.GetObject(
constraint.ValueDependencyId,
OpenMode.ForRead)
as AssocValueDependency;
if (valueDep.DependentOnObject.ObjectClass.IsDerivedFrom(
RXObject.GetClass(typeof(AssocVariable))))
{
AssocVariable var = Tx.GetObject(

0; valueDep.DependentOnObject,
OpenMode.ForRead)
as AssocVariable;
ed.WriteMessage("\n – Dim Parameter "
+ var.Name + " = " + var.Expression);
}
}
void DumpConstrainedGeometry(
Transaction Tx,
ConstrainedGeometry[] geometries)
{
Document doc = Application.DocumentManager.MdiActiveDocument;
Editor ed = doc.Editor;
foreach (ConstrainedGeometry goemetry in geometries)
{
ed.WriteMessage("\n – Constrained Geometry: "
+
goemetry.ToString().Remove(0, 34));
if(goemetry.GeomDependencyId != ObjectId.Null)
{
AssocGeomDependency goemDep = Tx.GetObject(
goemetry.GeomDependencyId,
OpenMode.ForRead)
as AssocGeomDependency;
Entity entity = Tx.GetObject(
goemDep.DependentOnObject,
OpenMode.ForRead)
as Entity;
ed.WriteMessage(" with Constrained Entity: " +
entity.ToString().Remove(0, 34));
return;
}
DumpConstrainedGeometry(Tx, goemetry.ConnectedGeometries);
}
}
–
Here is the result of the command when run on a database where I created a radial dimension constraint on a Circle and an aligned dimension constraint on a Line:
–
<
p style=”line-height: normal;margin: 0in 0in 0pt” class=”MsoNormal”>
Leave a Reply