var query = from p in publishers
join b in books on p equals b.Publisher into g
select new { Publisher = p.Name, Books = g};
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join ...into 分组查询,用lambda 扩展方法怎么写?
join ... into 分组查询,用lambda 扩展方法怎么写? var query = from p in publishers join b in books on p equals b.Publisher into g select new { Publisher = p.Name, Books = g};