如何在内存中列出了I组？ [英] How do I group in memory lists?

问题描述

我有富的清单。美孚拥有属性栏和Lum。有些FOOS具有相同的值吧。我如何使用的λ/ LINQ到组我FOOS由律师，所以我可以遍历每个组的兰卡斯特大学管理学院？

I have a list of Foo. Foo has properties Bar and Lum. Some Foos have identical values for Bar. How can I use lambda/linq to group my Foos by Bar so I can iterate over each grouping's Lums?

推荐答案

的 Deeno ，

您可以：

var foos = new List<Foo> {
   new Foo{Bar = 1,Lum = 1},
   new Foo{Bar = 1,Lum = 2},
   new Foo{Bar = 2,Lum = 3},
};

// Using language integrated queries:

var q = from foo in foos
        group foo by foo.Bar into groupedFoos
        let lums = from fooGroup in groupedFoos
                   select fooGroup.Lum
        select new { Bar = groupedFoos.Key, Lums = lums };

// Using lambdas

var q = foos.GroupBy(x => x.Bar).
            Select(y => new {Bar = y.Key, Lums = y.Select(z => z.Lum)});


foreach (var group in q)
{
    Console.WriteLine("Lums for Bar#" + group.Bar);
    foreach (var lum in group.Lums)
    {
        Console.WriteLine(lum);
    }
}

要了解更多关于LINQ阅读 101 LINQ样品

To learn more about LINQ read 101 LINQ Samples

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