Question

How can I obtain human readable string(i.e. image format itself) from System.Drawing.ImageFormat object?

I mean if I have ImageFormat.Png is that possible to convert it to “png” string?

EDIT: I see some misunderstanding here. Here is mine code:

Image objImage = Image.FromStream(file);

ImageFormat imFormat = objImage.RawFormat;

imFormat.ToString(); 

It returns “[ImageFormat: b96b3caf-0728-11d3-9d7b-0000f81ef32e]” but I want “Png“!

Answer 1

ImageFormat.Png.ToString() returns “Png”…

EDIT: OK, it seems ToString returns the name only for ImageFormat instances returned by the static properties…

You could create a lookup dictionary to get the name from the Guid:

private static readonly Dictionary<Guid, string> _knownImageFormats =
            (from p in typeof(ImageFormat).GetProperties(BindingFlags.Static | BindingFlags.Public)
             where p.PropertyType == typeof(ImageFormat)
             let value = (ImageFormat)p.GetValue(null, null)
             select new { Guid = value.Guid, Name = value.ToString() })
            .ToDictionary(p => p.Guid, p => p.Name);

static string GetImageFormatName(ImageFormat format)
{
    string name;
    if (_knownImageFormats.TryGetValue(format.Guid, out name))
        return name;
    return null;
}