Get bitmap file name

Question

I use this line below for create my Bitmap:

Bitmap b = new Bitmap(@"C:\<file name>");

After I modify this bitmap and I want to save it as in line below:

b.Save(@"C:\\<other file name>")

My question is - how to get the file name bitmap from property.
Simply put, I need to save the bitmap with the same name with whom I had initiated it.

Thanks

Answer 1

The upvoted answer is going to get you into trouble. Loading a bitmap from a file puts a lock on the file. You cannot save it back without disposing the bitmap first. Which is a chicken and egg problem which you can't resolve without cloning the bitmap. Which is a bit tricky in itself, the Bitmap.Clone() method is an optimized version that uses the same memory section that put the lock on the file in the first place. So doesn't actually releases the lock.

Here's a little class that takes care of creating a deep clone and memorizes the path and format of the original bitmap:

    class EditableBitmap : IDisposable {
        public EditableBitmap(string filepath) {
            using (var bmp = new Bitmap(filepath)) {
                this.bitmap = new Bitmap(bmp);
                this.bitmap.SetResolution(bmp.HorizontalResolution, bmp.VerticalResolution);
            }
            this.path = System.IO.Path.GetFullPath(filepath);
            this.format = bitmap.RawFormat;
        }

        public Bitmap Bitmap { get { return bitmap; } }

        public void Save() {
            bitmap.Save(path, format);
            this.Dispose();
        }

        public void Dispose() {
            if (bitmap != null) {
                bitmap.Dispose();
                bitmap = null;
            }
        }
        private Bitmap bitmap;
        private System.Drawing.Imaging.ImageFormat format;
        private string path;
    }

And use it like this:

        using (var bmp = new EditableBitmap(@"c:\temp\test.png")) {
            DoSomething(bmp.Bitmap);
            bmp.Save();
        }

Answer 2

Perhaps you can do this with Metadata - but I'm not familiar with this subject so I'm not completely sure it's possible, nor do I how to do it.
What I do suggest is make a type.

So for example you can create a class which will have a Bitmap⁽¹⁾ property for the image, and a string for the file's path.

class LocalBitmap
{
    public Bitmap Bitmap { get; set; }
    public String Path { get; set; }

    public LocalBitmap(String path)
    {
        Path = path;
        Bitmap = new Bitmap(path);
    }
}

And use it like so:

LocalBitmapimage = new LocalBitmap(@"C:\myImage.bmp");

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⁽¹⁾ Consider using the Image class instead. It's the base class of Bitmap. If you're not sure which one to use ask yourself if your class requires an image or an image of that exact format (that is, bitmap).