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join Linq

发布时间:2016-12-17 15:00:05
1.left join, 为空时用defaultvar leftJoinQuerybyDefault = from publisher in SampleData.Publishers join book in SampleData.Boo ...

1.left join, 为空时用default

var leftJoinQuerybyDefault = from publisher in SampleData.Publishers                     join book in SampleData.Books                      on publisher equals book.Publisher into publisherBooks                     from book in publisherBooks.DefaultIfEmpty()                     select new                     {                       PublisherName = publisher.Name,                       BookName = (book == default(Book)) ? "no book" : book.Title                     };

原标题:join Linq

关键词:linq

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