.NET 中子集合中的项目总数

Question

How to get count of items in the child collection ?

class company
{
    public ObservableCollection<employee> employees { get; set; }
}

class employee
{
}

Lets say there are 5 companies and each company has 7 employees in its collection. How to get the count of total employees (=35)?

Answer 1

您可以使用SelectMany

Companies.SelectMany(x => x.employees).Count()