using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;

using System.IO;
using System.Reflection;

namespace PathTest
{
    public class Command2
    {
        [CommandMethod("PTHA")]
        public void AssemblyPath()
        {
            Document doc =
              Application.DocumentManager.MdiActiveDocument;
            //當前執行程序集完整路徑
            string File = Assembly.GetExecutingAssembly().Location;
            //執行程序集所在目錄
            FileInfo assinfo = new FileInfo(File);
            string path = assinfo.DirectoryName;

            doc.Editor.WriteMessage(
              "n當前程序序集路徑: " + path
            );
        }
    }
}