C# 帮助使用Linq表达式返回基于字段计数的字符串列表

假设我有一个带有以下列的表注释：Id、Comment、Category、CreatedDate、CommenterId

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我想从Comments表中获得前5个类别（基于该表中每个类别的计数）。如何在linq中执行此操作，以返回列表或IQueryable？

您可以使用以下内容：

var query = comments
    .GroupBy(comment => comment.Category)
    .OrderByDescending(g => g.Count())
    .Select(g => g.Key)
    .Take(5);

var topComments = from comment in Comments
                  group comment by comment.Category into grp
                  orderby grp.Count() descending
                  select grp.Key;

var topFive = topComments.Take(5);

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试着这样做：

var query = comments
    .GroupBy(comment => comment.Category)
    .OrderByDescending(g => g.Count())
    .Select(g => g.Key)
    .Take(5);

var topComments = from comment in Comments
                  group comment by comment.Category into grp
                  orderby grp.Count() descending
                  select grp.Key;

var topFive = topComments.Take(5);

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谢谢@scmccart和@Mark Byers。工作得很有魅力。