LINQ的All的方法

Book[] books = { new Book { Publishing = "商务出版社",ISBN="13468564394",PublicationDate=Convert.ToDateTime("2016-04-13")},
new Book { Publishing = "中华出版社",ISBN="56634565746",PublicationDate=Convert.ToDateTime("2016-01-19")},
new Book { Publishing = "海天出版社",ISBN="78234235454",PublicationDate=Convert.ToDateTime("2016-03-22")},
new Book { Publishing = "云贵出版社",ISBN="46724356756",PublicationDate=Convert.ToDateTime("2016-02-22")}
};

IEnumerable<Book> query = from bk in books
where books.All(b => b.PublicationDate > Convert.ToDateTime("2016-01-01"))
select bk;

query.ForEach(delegate (Book b)
{
WriteLiteral(string.Format("publishing: {0}; ISBN: {1}; Publication Date: {2} <br />",
b.Publishing,
b.ISBN,
b.PublicationDate.ToString("yyyy-MM-dd")));
});