嵌套Linq查询不';I don’我没有表现得像预期的那样
我的问题很简单,在开头给出了下面的代码嵌套Linq查询不';I don’我没有表现得像预期的那样,linq,Linq,我的问题很简单,在开头给出了下面的代码 var list = new[] { new { name = "lixiang", age = 14 }, new { name = "lixiang", age = 16 }, new { name = "lidian", age = 14 } }; var people = list.GroupBy(x => x.name); 这将给我一个预期的编译器错误,因为人是一组记录: var x1 = people.Selec
var list = new[] {
new { name = "lixiang", age = 14 },
new { name = "lixiang", age = 16 },
new { name = "lidian", age = 14 }
};
var people = list.GroupBy(x => x.name);
这将给我一个预期的编译器错误,因为人是一组记录:
var x1 = people.Select(x => x.name);
但我不明白的是,为什么这个能成功编译
var x2 = people.Select(x => x.Select(y => y.name));
people
是一个IEnumerable
,它继承了IEnumerable x.name)
将是获得相同结果的更快的方法(假设排序不重要)
var x3 = people.SelectMany(x => x.Select(y => y.name));