C# How can I test a file is a jpeg?

Question

Using C# how can I test a file is a jpeg? Should I check for a .jpg extension?

Thanks

Answer 1

This will loop through each file in the current directory and will output if any found files with JPG or JPEG extension are Jpeg images.

      foreach (FileInfo f in new DirectoryInfo(".").GetFiles())
        {
            if (f.Extension.ToUpperInvariant() == ".JPG"
                || f.Extension.ToUpperInvariant() == ".JPEG")
            {
                Image image = Image.FromFile(f.FullName);

                if (image.RawFormat == ImageFormat.Jpeg)
                {
                    Console.WriteLine(f.FullName + " is a Jpeg image");
                }
            }
        }