如何根据c＃linq中外部列表​​中的键对内部列表数据进行分组

Question

我有一个类结构和数据如下：

   public class Company
{
    public string CompanyName { get; set; }
    public List<Employee> Employees { get; set; }
}
public class Employee
{
    public string EmployeeName { get; set; }
}
  ObservableCollection<Company> list1 = new ObservableCollection<Company>
        { new Company { CompanyName = "com1",
                        Employees = new List<Employee>
                        { new Employee {EmployeeName = "Ron"},
                          new Employee { EmployeeName = "John" },
                          new Employee { EmployeeName = "David"  } } },
        new Company { CompanyName = "com2",
                        Employees = new List<Employee>
                        { new Employee {EmployeeName = "manuel"},
                          new Employee { EmployeeName = "smith" },
                          new Employee { EmployeeName = "rony"  } } },
        new Company { CompanyName = "com3",
                        Employees = new List<Employee>
                        { new Employee {EmployeeName = "kevin"},
                          new Employee { EmployeeName = "chacko" },
                          new Employee { EmployeeName = "willy"  } } }};

我想根据公司类中的外部公司名称对Employee类中的employeesenames进行分组。我怎样才能在linq中实现这一目标。

Answer 1

我得到了它的工作，  我添加了一个继承IEnumerable

的类

    class GroupViewModel<T> : IEnumerable<T>
{
    public IEnumerable<T> Items { get; private set; }

    public string Name { get; private set; }
    public string Id { get; private set; }
    public GroupViewModel(string name,string id, IEnumerable<T> items)
    {
        this.Id = id;
        this.Name = name;
        this.Items = items;
    }

    public IEnumerator<T> GetEnumerator()
    {
        return this.Items.GetEnumerator();
    }

    IEnumerator IEnumerable.GetEnumerator()
    {
        return this.Items.GetEnumerator();
    }
}

然后我将列表分组如下：

            var groupedList = from model in list1
                  group model by new { model.CompanyName,model.Id, model.Employees } into wordCollection
                  select new GroupViewModel<Employee>(wordCollection.Key.CompanyName, wordCollection.Key.Id, wordCollection.Key.Employees);