Linq and it's convention

最新推荐文章于 2026-01-08 14:15:43 发布

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本文介绍如何利用C#中的LINQ表达式从一组人员数据中筛选出使用C++编程语言的开发者，并通过不同方式实现相同功能。

//definition of an array which can be inumerable
People[] peoples = new People[] {
        new People("Li", "C#"),
        new People("zhang", "C++"),
        new People("Smith", "C++")
      };
// Linq expression
IEnumerable<string> peoples_cpp =
    from d in peoples
    where d._language == "C++"
    select d._name;
// it's counterpart first
IEnumerable<string> peoples_cpp =
    peoples.Where(d => d._language == "C++").Select(d => d._name);
// it's counterpart first
Func<People, bool> filtering = d => d._language == "C++";
Func<People, string> selectPredicate = d => d._name;
IEnumerable<string> peoples_cpp =
    peoples.Where(filtering).Select(selectPredicate);