如何添加文件扩展名而不删除旧扩展名

Question

I have the desire to add file extensions and not change the old extension. Suppose file.jpg becomes file.jpg.bmp is that possible ?

string filename;
                string[] file = Directory.GetFiles(folder_path);
                foreach (string myfile in file)
                {
                    filename = Path.ChangeExtension(myfile, ".bmp");
                    System.IO.File.Move(myfile, filename);
                }

my code only changes extensions, for example file.jpg becomes a file .bmp

I want to be file.jpg.bmp

Please help thanks

Answer 1

Try something like that:

string[] file = Directory.GetFiles(folder_path);
foreach (string myfile in file)
{
      System.IO.File.Move(myfile, myfile + ".bmp");
}