具有子 foreach 循环（嵌套 foreach）的 foreach 循环的 Lambda 表达式并更改值

Question

我有两个类如下：

    public class Notification
    {
        public System.Guid NotificationId { get; set; }
        public Nullable<System.Guid> ClassId { get; set; }
        public Nullable<System.Guid> SentBy { get; set; }
        public string SenderName { get; set; }
        public Nullable<bool> Visible { get; set; }
        public string MessageText { get; set; }
        public Nullable<System.Guid> ClassViewRegId { get; set; }
        public string CreatedBy { get; set; }
        public Nullable<System.DateTime> CreatedDate { get; set; }
        public string LastModifiedBy { get; set; }
        public Nullable<System.DateTime> LastModifiedDate { get; set; }
        public List<MessageRecipient> Recipients { get; set; }
    }

    public partial class Recipient
    {
        public System.Guid NotificationRecipientId { get; set; }  
        public System.Guid NotificationId { get; set; }
        public string RecipientType { get; set; }
        public Nullable<System.Guid> RecipientId { get; set; }   
        public Nullable<System.Guid> ClassId { get; set; }
        public Nullable<System.Guid> ClassViewRegId { get; set; }
    }

现在我的代码有 List 有另一个列表 List。

所以我尝试检查并更改值如下：

 notify.Where(n => n.Recipients.Where(r => r.RecipientType == "Teacher").ToList().ForEach(s=>s.RecipientType="");

请任何人帮助我如何检查和更改子列表属性的值。

Answer 1

使用简单的 foreach 循环：

var teachers = notify.SelectMany(n => n.Recipients)
                     .Where(r => r.RecipientType == "Teacher");

foreach(Recipient teacher in teachers)
    teacher.RecipientType = "";