C#代码图片导出dwg格式

要使用C#代码将图片导出为DWG格式，您需要使用CAD API，例如AutoCAD的API或者BricsCAD的API。下面是一个使用AutoCAD API的示例代码，它可以将指定的图片导出为DWG格式：

using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.Runtime;
using System.IO;

namespace ExportImageToDWG
{
    public class Commands
    {
        [CommandMethod("ExportImageToDWG")]
        public static void ExportImageToDWG()
        {
            // Prompt the user to select the image file to be exported
            var promptResult = Application.DocumentManager.MdiActiveDocument.Editor.GetString("\nEnter the full path of the image file to be exported: ");
            if (promptResult.Status != PromptStatus.OK)
                return;
            var imagePath = promptResult.StringResult;

            // Prompt the user to select the DWG file to export to
            var fileDialog = new System.Windows.Forms.SaveFileDialog();
            fileDialog.Filter = "DWG files (*.dwg)|*.dwg";
            fileDialog.Title = "Export image to DWG";
            var dialogResult = fileDialog.ShowDialog();
            if (dialogResult != System.Windows.Forms.DialogResult.OK)
                return;
            var dwgPath = fileDialog.FileName;

            // Open the DWG file and create a new layout
            using (var db = new Database(false, true))
            {
                db.ReadDwgFile(dwgPath, FileOpenMode.OpenForReadAndWriteNoShare, true, "");
                using (var transaction = db.TransactionManager.StartTransaction())
                {
                    var layoutManager = LayoutManager.Current;
                    var layout = new Layout();
                    layout.LayoutName = "Exported Image";
                    layoutManager.CreateLayout(layout.LayoutName);
                    transaction.AddNewlyCreatedDBObject(layout, true);

                    // Add the image to the layout
                    var imageDef = new RasterImageDef();
                    imageDef.SourceFileName = imagePath;
                    imageDef.Load();
                    var image = new RasterImage();
                    image.ImageDefId = imageDef.ObjectId;
                    image.Rotation = 0;
                    image.ScaleToFit = true;
                    image.ShowImage = true;
                    image.SetDatabaseDefaults();
                    layout.BlockTableRecordId.GetObject(OpenMode.ForWrite).AppendEntity(image);
                    transaction.AddNewlyCreatedDBObject(image, true);

                    // Commit the transaction and save the changes to the DWG file
                    transaction.Commit();
                    db.SaveAs(dwgPath, DwgVersion.Current);
                }
            }

            // Inform the user that the export is complete
            Application.DocumentManager.MdiActiveDocument.Editor.WriteMessage("\nImage exported to " + dwgPath);
        }
    }
}

请注意，此示例代码仅供参考，您可能需要根据您的具体需求进行修改。另外，您需要将AutoCAD的API添加到您的项目中，以便使用AutoCAD的对象和方法。