Image metadata

// LINQPad script
// References: System.Xaml, WindowsBase, PresentationCore
// Namespaces: System.Windows.Media.Imaging

void Main()
{
    string path = @"(image_path)";
    Uri imageUri = new Uri(path);

    var decoder = BitmapDecoder.Create(imageUri, BitmapCreateOptions.None, BitmapCacheOption.OnLoad);

    // Global metadata
    DumpMetadata(decoder.Metadata);

    // Metadata for each frame
    DumpAllMetadata(decoder.Frames);
}

void DumpAllMetadata(IEnumerable<BitmapFrame> frames)
{
    int i = 0;
    foreach (var f in frames)
    {
        using (var writer = new StringWriter())
        {
            DumpMetadata((BitmapMetadata)f.Metadata, writer);
            writer.ToString().Dump("Frame " + i++);
        }
    }
}

void DumpMetadata(BitmapMetadata metadata)
{
    DumpMetadata(metadata, 0, Console.Out);
}

void DumpMetadata(BitmapMetadata metadata, TextWriter writer)
{
    DumpMetadata(metadata, 0, writer);
}

void DumpMetadata(BitmapMetadata metadata, int indentLevel)
{
    DumpMetadata(metadata, indentLevel, Console.Out);
}

void DumpMetadata(BitmapMetadata metadata, int indentLevel, TextWriter writer)
{
    if (metadata == null)
    {
        writer.WriteLine ("(No metadata)");
        return;
    }
    string indent = new string('\t', indentLevel);
    foreach (var propertyName in metadata)
    {
        object value = metadata.GetQuery(propertyName);
        BitmapMetadata complexProperty = value as BitmapMetadata;
        if (complexProperty != null)
        {
            writer.WriteLine("{0}{1} =", indent, propertyName);
            DumpMetadata(complexProperty, indentLevel + 1, writer);
        }
        else
        {
            Type type = null;
            if (value != null)
                type = value.GetType();
            writer.WriteLine("{0}{1} = {2} ({3})", indent, propertyName, value, type);
        }
    }
}