C# 使用 linq 从列表中删除项目
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Remove item from list using linq
提问by Neeraj Kumar Gupta
How to remove item from list using linq ?.
如何使用 linq 从列表中删除项目？
I have a list of items and each item it self having a list of other items now I want to chaeck if other items contains any items of passed list so main item should be remove. Please check code for more clarity.
我有一个项目列表，每个项目本身都有一个其他项目的列表，现在我想检查其他项目是否包含传递列表中的任何项目，因此应该删除主要项目。请检查代码以获得更清晰的信息。
public Class BaseItems
{
public int ID { get; set; }
public List<IAppointment> Appointmerts { get; set; }
}
Public DeleteApp(List<IAppointment> appointmentsToCheck)
{
List<BaseItems> _lstBase ; // is having list of appointments
//now I want to remove all items from _lstBase which _lstBase.Appointmerts contains
any item of appointmentsToCheck (appointmentsToCheck item and BaseItems.Appointmerts
item is having a same reference)
//_lstBase.RemoveAll(a => a.Appointmerts.Contains( //any item from appointmentsToCheck));
}
采纳答案by Jan P.
_lstBase
.RemoveAll(a => a.Appointmerts.Any(item => appointmentsToCheck.Contains(item)));
回答by Pranay Rana
var data =
_lstBase.
Except(a => a.Appointmerts.Any
(item => appointmentsToCheck.Contains(item)));
or
或者
var data =
_lstBase.
Where(a => !a.Appointmerts.Any
(item => appointmentsToCheck.Contains(item)));
回答by flindeberg
Just to point out, LINQ is for querying data and you will not actually remove the element from the original container. You will have to use _lstBase.Remove(item)in the end. What you can do is to use LINQ to find those items.
只是指出，LINQ 用于查询数据，您实际上不会从原始容器中删除元素。你最终将不得不使用_lstBase.Remove(item)。您可以做的是使用 LINQ 来查找这些项目。
I am assuming that you are using some kind of INotify pattern where it is pattern breaking to replace _lstBasewith a filtered version of itself. If you can replace _lstBase, go with @JanP.'s answer.
我假设您正在使用某种 INotify 模式，其中它破坏了模式以替换_lstBase为自身的过滤版本。如果您可以替换_lstBase，请使用@JanP. 的答案。
List<BaseItems> _lstBase ; // populated original list
Public DeleteApp(List<IAppointment> appointmentsToCheck)
{
// Find the base objects to remove
var toRemove = _lstBase.Where(bi => bi.Appointments.Any
(app => appointmentsToCheck.Contains(app)));
// Remove em!
foreach (var bi in toRemove)
_lstBase.Remove(bi);
}
