Getting the full path of the active drawing in AutoCAD using .NET

I had a question come in by email about how to find out the full path of a drawing open inside AutoCAD. Here's some C# code that does just this:

using Autodesk.AutoCAD.Runtime;

using Autodesk.AutoCAD.ApplicationServices;

using Autodesk.AutoCAD.DatabaseServices;

namespace PathTest

{

  public class Commands

  {

    [CommandMethod("PTH")]

    public void DrawingPath()

    {

      Document doc =

        Application.DocumentManager.MdiActiveDocument;

      HostApplicationServices hs =

        HostApplicationServices.Current;

      string path =

        hs.FindFile(

          doc.Name,

          doc.Database,

          FindFileHint.Default

        );

      doc.Editor.WriteMessage(

        "\nFile was found in: " + path

      );

    }

  }

}

Here's what happens when you run the PTH command, with a file opened from an obscure location, just to be sure:

Command: pth

File was found in: C:\Temp\test.dwg

Update:

Tony Tanzillo wrote in a comment:

I think you could also read the Filename property of the Database to get the full path to the drawing, keeping in mind that if the drawing is a new, unsaved document, the Filename property returns the .DWT file used to create the new drawing.

Thanks, Tony - shame on me for missing the obvious. In my defence, I wrote the post in between meetings in Las Vegas, if that's any excuse. :-)