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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