Topic: Determine if Dynamic Block has an Alignment Paramter

[cmwade77]

I would like to know if there is a way to determine if a dynamic block contains an Alignment parameter? I tried searching for a parameter with the name Alignment, but unfortunately Alignment parameters can't be named and don't get the hardcoded name Alignment listed. This is what I tried:

Code - C#: [Select]

1. private static bool HasAlignmentParameter(BlockReference blockRef)
2.         {
3.             if (blockRef.IsDynamicBlock)
4.             {
5.                 foreach (DynamicBlockReferenceProperty prop in blockRef.DynamicBlockReferencePropertyCollection)
6.                 {
7.                     if (prop.PropertyName.Equals("Alignment", StringComparison.OrdinalIgnoreCase))
8.                     {
9.                         return true;
10.                     }
11.                 }
12.             }
13.             return false;
14.         }

[gile]

Hi,

As far as I know, the .NET API does not expose this.
You can get it by inspecting the BlockTableRecord DXF data (see the attached (work in progress) extension methods).
Here's a testing command:

Code - C#: [Select]

1.         [CommandMethod("TEST")]
2.         public static void Test()
3.         {
4.             var doc = Application.DocumentManager.MdiActiveDocument;
5.             var db = doc.Database;
6.             var ed = doc.Editor;
7.  
8.             var promptEntityOptions = new PromptEntityOptions("\nSelect Block: ");
9.             promptEntityOptions.SetRejectMessage("\nSelected object is not a block reference.");
10.             promptEntityOptions.AddAllowedClass(typeof(BlockReference), true);
11.             var promptEntityResult = ed.GetEntity(promptEntityOptions);
12.             if (promptEntityResult.Status != PromptStatus.OK)
13.                 return;
14.  
15.             using (var tr = db.TransactionManager.StartOpenCloseTransaction())
16.             {
17.                 var br = (BlockReference)tr.GetObject(promptEntityResult.ObjectId, OpenMode.ForRead);
18.                 var btr = (BlockTableRecord)tr.GetObject(br.DynamicBlockTableRecord, OpenMode.ForRead);
19.                 try
20.                 {
21.                     if (btr.GetDynamicPropertiesData(tr).Any(tvs => tvs.Any(tv => tv == new TypedValue(0, "BLOCKALIGNMENTPARAMETER"))))
22.                         ed.WriteMessage("\nSelect block reference has an alignment parameter");
23.                     else
24.                         ed.WriteMessage("\nSelect block reference has none alignment parameter");
25.                 }
26.                 catch (System.Exception ex) { ed.WriteMessage($"\n{ex.Message}"); }
27.                 tr.Commit();
28.             }
29.         }

[cmwade77]

Wow, thank you, no wonder why I couldn't find it in a google search. This seems like such a basic thing, you would expect it to be there.