如何使用Linq將列表集合添加到列表中？

Question

我有一個列表

List<List<Employee>> EmployeeListCollection; 

，並希望

List<Employee> EmployeeList=//all employee in EmployeeListCollection 

什麼是查詢？

Answer 1

List<Employee> EmployeeList = EmployeeListCollection.SelectMany(c => c).ToList(); 

Answer 2

試試這個：

List<List<Employee>> EmployeeListCollection; 
List<Employee> EmployeeList; 
foreach(var emplst in EmployeeListCollection) 
{ 
    foreach(var emp in emplst) 
{ 
    EmployeeList.add(emp); 
} 
}