C# 聚合操作-Linq中不支持类型“System.Data.Linq.Binary”

在上面的查询章节中，Logo的类型为byte[]，当我尝试执行此查询时，我遇到以下错误

聚合操作-Linq中不支持类型“System.Data.Linq.Binary”

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当我执行上述查询时，出现以下错误：“System.Data.Linq.Binary”不包含“Count”的定义，并且找不到接受“System.Data.Linq.Binary”类型的第一个参数的扩展方法“Count”。您能告诉我此查询的作用吗。表示您对此查询的期望值？用户有章节列表，章节有出版物列表。我需要一份章节列表和出版数量。结果应该如下[{ID，ChapterName，PublicationCount，Logo}，{ID，ChapterName，PublicationCount，Logo}]当我执行上述查询时，出现以下错误“System.Data.Linq.Binary”不包含“Count”的定义，并且没有扩展方法“Count”接受类型为“System.Data.Linq.Binary”的第一个参数，您能告诉我此查询的作用吗。表示您对此查询的期望值？用户有章节列表，章节有出版物列表。我需要一份章节列表和出版数量。结果应如下[{ID，ChapterName，PublicationCount，Logo}，{ID，ChapterName，PublicationCount，Logo}]获取以下错误SQL Server不处理NText，Text，Xml的比较，或图像数据类型以下代码对我有效，但我不喜欢子查询从KM_章节中的章节获取章节徽标logo=，其中chapter.Id==x.Key.Id选择chapter.logo获取以下错误SQL Server不处理NText、Text、Xml、，或者图像数据类型下面的代码对我有用，但我不喜欢子查询从KM_章节中的章节获取章节徽标logo=，其中chapter.Id==x.Key.Id选择chapter.logo

 (from chapter in Chapters
        join userChapter in UserChapters on chapter.Id equals userChapter.ChapterId
        join pub in Publications on chapter.Id equals pub.ChapterId into P 
        from publication in P.DefaultIfEmpty()
        where userChapter.UserId == 9
        group new
                           {
                               PubID = publication.Id,
                               Logo = chapter.Logo
                           } by new { chapter.Id, chapter.Name} into x
                           orderby x.Key.Name
        select new 
       {
           Id = x.Key.Id,
           chapterName = x.Key.Name,
           PublicationCount = x.Count(z => z.PubID > 0),
           Logo = x.Max(z=>z.Logo)
       }
)

    (from chapter in Chapters
    join userChapter in UserChapters on chapter.Id equals    userChapter.ChapterId
    join pub in Publications on chapter.Id equals pub.ChapterId into P 
    from publication in P.DefaultIfEmpty()
    where userChapter.UserId == 9
    group new
                       {
                           PubID = publication.Id,
                           Logo = chapter.Logo
                       } by new { chapter.Id, chapter.Name} into x
                       orderby x.Key.Name
    select new 
   {
       Id = x.Key.Id,
       chapterName = x.Key.Name,
       Logo = x.Max(z=>z.Logo.Count())
   }

    (from chapter in Chapters
    join userChapter in UserChapters on chapter.Id equals    userChapter.ChapterId
    join pub in Publications on chapter.Id equals pub.ChapterId into P 
    from pub in P.DefaultIfEmpty()
    where userChapter.UserId == 9
    group pub by new { chapter.Id, chapter.Name,chapter.Logo,pub.Id} into x
                       orderby x.Key.Name
    select new 
   {
       Id = x.Key.Id,
       chapterName = x.Key.Name,
       Logo = x.Key.Logo,
   PublicationCount=x.Count()
   }