如何在 vb.net 中使用 lambda 删除 List 的指定项
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How to delete specify items of List using lambda in vb.net
提问by frankie
Have such situation.
There are two lists: list1as List(of Integer)and list2as List(of Integer).
有这样的情况。有两个列表：list1asList(of Integer)和list2as List(of Integer)。
I need to remove all items of list1 that are same as items of list2.
我需要删除与 list2 的项目相同的 list1 的所有项目。
For example:
例如：
list1 = 0, 1, 2, 3, 6, 10
list2 = 3, 6
After removing list2 from list1 : list1 = 0, 1, 2, 10.
从列表1删除列表2后：list1 = 0, 1, 2, 10。
回答by Tim Schmelter
list1.RemoveAll(Function(i) list2.Contains(i))
or just with the delegate
或者只是与代表
list1.RemoveAll(AddressOf list2.Contains)
As noted from Meta-Knight, if list2is just a lookup list which cannot contain duplicates anyway you better use a HashSet(Of Int32)instead. It has a O(1)lookup complexity which is independend of it's size with the downside of requiring more memory if you also need list2.
正如 Meta-Knight 所指出的，如果list2只是一个不能包含重复项的查找列表，你最好使用 aHashSet(Of Int32)代替。它具有O(1)查找复杂性，这与其大小无关，但如果您还需要list2.
You can create one easily:
您可以轻松创建一个：
Dim setOfNums = new HashSet(Of Int32)(list2)
list1.RemoveAll(AddressOf setOfNums.Contains)
回答by Joel Coehoorn
list1 = list1.Except(list2).ToList();
