c# 读取R14版本的dxf并转换为高版本

要读取R14版本的DXF文件并将其转换为高版本，可以使用AutoCAD的API或者第三方库来完成。以下是使用AutoCAD的API读取R14版本的DXF文件并转换为高版本的示例代码：

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

namespace DxfConverter
{
    public class Commands
    {
        [CommandMethod("ConvertDxf")]
        public void ConvertDxf()
        {
            Document doc = Application.DocumentManager.MdiActiveDocument;
            Database db = doc.Database;

            using (Transaction tr = db.TransactionManager.StartTransaction())
            {
                // Open the R14 DXF file
                DBObject obj = db.GetObjectFromXref("path/to/R14.dxf");

                if (obj is BlockTableRecord)
                {
                    BlockTableRecord btr = obj as BlockTableRecord;

                    // Create a new drawing database
                    Database newDb = new Database();
                    newDb.ReadDwgFile("", FileOpenMode.Create);

                    // Copy the R14 blocks and entities to the new database
                    foreach (ObjectId id in btr)
                    {
                        Entity ent = tr.GetObject(id, OpenMode.ForRead) as Entity;

                        if (ent != null)
                        {
                            Entity newEnt = ent.Clone() as Entity;
                            newDb.AddToModelSpace(newEnt);
                        }
                    }

                    // Save the new database as a higher version DXF file
                    newDb.DxfOut("path/to/higherVersion.dxf", 0);

                    // Close the new database
                    newDb.Dispose();
                }

                tr.Commit();
            }
        }
    }
}

请注意，此示例代码仅用于演示目的，实际应用中可能需要添加更多的错误处理和数据转换逻辑。