public LineLiveCommentViewModel(LineLiveSitePlugin.ILineLiveItem item, IMessageMetadata metadata, IMessageMethods methods, IConnectionStatus connectionStatus, IOptions options)
            : this(metadata, methods, connectionStatus, options)
        {
            var comment = item;

            _message = comment;

            _nameItems   = Common.MessagePartFactory.CreateMessageItems(comment.DisplayName);
            MessageItems = comment.CommentItems;
            Thumbnail    = new Common.MessageImage()
            {
                Url    = comment.UserIconUrl,
                Height = 40,//_optionsにcolumnの幅を動的に入れて、ここで反映させたい。propertyChangedはどうやって発生させるか
                Width  = 40,
            };
            Id       = null;
            PostTime = comment.PostedAt.ToString("HH:mm:ss");
        }
        public LineLiveCommentViewModel(LineLiveSitePlugin.ILineLiveItem item, IMessageMetadata metadata, IMessageMethods methods, IConnectionStatus connectionStatus, IOptions options)
            : this(metadata, methods, connectionStatus, options)
        {
            var comment = item;

            _message = comment;

            _nameItems   = comment.NameItems;
            MessageItems = comment.CommentItems;
            Thumbnail    = null;
            //Thumbnail = new Common.MessageImage
            //{
            //    Url = comment.UserIconUrl,
            //    Alt = "",
            //    Height = 40,//_optionsにcolumnの幅を動的に入れて、ここで反映させたい。propertyChangedはどうやって発生させるか
            //    Width = 40,
            //};
            Id       = null;
            PostTime = comment.PostTime;
        }