public override object ConvertFromInvariantString(string value)
        {
            if (value != null)
            {
                Uri uri;
                return(Uri.TryCreate(value, UriKind.Absolute, out uri) && uri.Scheme != "file" ? MediaSource.FromUri(uri) : MediaSource.FromFile(value));
            }

            throw new InvalidOperationException(string.Format("Cannot convert \"{0}\" into {1}", value, typeof(MediaSource)));
        }