AutoCAD .NET: Iterate Through the Viewports

We need to iterate through the viewports of the current database from time to time. Here is some succinct and good code in C# to do so.

    [CommandMethod("ViewportIterator")]
    public static void ViewportIterator_Method()
    {
      Database database = HostApplicationServices.WorkingDatabase;
      using (Transaction transaction = database.TransactionManager.StartTransaction())
      {
        SymbolTable symTable = (SymbolTable)transaction.GetObject(database.ViewportTableId, OpenMode.ForRead);
        foreach (ObjectId id in symTable)
        {
          ViewportTableRecord symbol = (ViewportTableRecord)transaction.GetObject(id, OpenMode.ForRead);

          //TODO: Access to the symbol
          MgdAcApplication.DocumentManager.MdiActiveDocument.Editor.WriteMessage(string.Format("\nName: {0}", symbol.Name));
        }

        transaction.Commit();
      }
    }

If the command is run, something like the following may be printed out to the command line window.

Command: ViewportIterator
Name: *Active

The leading edge AutoCAD .NET Addin Wizard (AcadNetAddinWizard) provides various wizards, coders, and widgets to help program AutoCAD addins in C#, VB.NET or even C++/CLI.

Comments

[BKSpurgeon]

Hi Spider,

What is the difference between the ViewportTableRecord class and the Viewport class? In other words, if I want to iterate through the viewports, shouldn't I be iterating through Viewports rather than ViewportTableRecords?

chrs, Ben