嵌套列表中的不同項目

Question

有以下型號：

public class VMDeliveryList  //[View-model]
{
    public List<ContractDelivery> ContractDeliveryList { get; set; }
}

public class ContractDelivery
{
    public Contract Contract { get; set; }
    public List<Delivery> DeliveryList { get; set; }
}

public class Delivery
{
    public int Id { get; set; }
    public Employee Employee { get; set; }
}

public class Employee
{
    public int Id { get; set; }
}

我需要為不同的Employee.Id創建foreach循環感謝您的建議。

Answer 1

您可以使用SelectMany展平列表，然后使用Select獲得Id

foreach(int id in viewModel.ContractDeliveryList.SelectMany(a => a.DeliveryList)
                                                .Select(b => b.Employee.Id)
                                                .Distinct() )
{
    ....
}

Answer 2

假設您有視圖模型的vmDeliveryList實例。 使用lambda語法：

var ids = vmDeliveryList.ContractDeliveryList
                        .SelectMany(cdl => cdl.DeliveryList)
                        .Select(dl => dl.Employee.Id)
                        .Distinct();

不幸的是，查詢語法中沒有Distinct()方法，因此您只能選擇所有id，然后應用與眾不同的方法：

var allIds = from cdl in vmDeliveryList.ContractDeliveryList
             from dl in cdl.DeliverList
             select dl.Employee.Id;

var ids = allIds.Distinct();