Question

假设我有以下项目：

ID      Category        Name

1       Fruit           Banana
2       Car             Mescedes
3       Fruit           Blackberry
4       Fruit           Mango
5       Car             Lexus
6       Fruit           Melon
7       Car             BMW
8       Car             Toyota

我想将它们分组到Category，并且只采用每个Category的前3项。有可能吗？

我期待输出：

ID        Category        Name

1        Fruit           Banana
3        Fruit           Blackberry
4        Fruit           Mango
2        Car             Mescedes
5        Car             Lexus
7        Car             BMW

任何帮助都将不胜感激！

Answer 1

从头开始，未经测试：

from c in categoryList
group by c.Category into g
let fewItems = g.Take(3).ToList()
return new { Category = g.Key, Items = fewItems }

Answer 2

让我们说列表集合被命名为categoryList ..

linq查询到你想要的是：

categoryList.GroupBy(c=>c.Category).Take(3)

然后GroupBy接受LINQ to Entities？

2 个答案: