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[ASP.net教程]LINQ的All的方法


方法All返回布尔值bool,判断集合中是否所有元素都满足某一条件,通俗一点说,就是每一个元素,均符合同一个条件,它才返回真,不然返回假。

举列,创建一个model:

 

source code:

namespace Insus.NET.Models{  public class Book  {    public string Publishing { get; set; }    public string ISBN { get; set; }    public DateTime PublicationDate { get; set; }  }}

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在ASP.NET MVC的视图片中,实现:


source code:

 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")));      });

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更好理解,修改一下: