Question

如何在ListCollectionView中进行双重分组（通过双重分组，我的意思不仅仅是按两个属性进行分组，而是将已经按其他属性分组的内容进行分组）？

示例：

class Person{
     public string Name;
     public int Age;
{

List<Person> list = new List<Person>{
  new Person{ Name = Alex, Age = 22 },
  new Person{ Name = Alex, Age = 23 },
  new Person{ Name = Sam, Age = 19 },
  new Person{ Name = Sam, Age = 33 }
};
ListCollectionView listView = new ListCollectionView(list);
listView.GroupDescriptions.add(new PropertyGroupDescription("Name"));

that is all i have right now, is there some way?

亚历：

22

Alex 22;

23

Alex 23;

山姆：

19

Sam 19;

33

Sam 33;

提前感谢您的帮助！

Answer 1

var result= list.GroupBy(item => item.Name)
                .Select(group => new 
                { 
                    Name = group.Key,
                    Values = group.GroupBy(item => item.Age)
                                  .Select(innerGroup => new 
                                  { 
                                      Age = group.Key, 
                                      Values = group.ToList() 
                                  }).ToList()
                }).ToList();

ListCollectionView分组已经分组的项目

1 个答案: