Excluding an item from a list where an element matches an element from another list of a different type

Question

I have the following populated lists:

List<Item> Items
List<long> QueueID

Where Item is this:

public Class Item
{
long QueueID    
....
}

I need to make a new List of Items that excludes Items with QueueIDs that are in the other List.

I'm trying this but the compiler doesn't like it.

var result = Items.Where(x => !QueueID.Exists(x => x.QueueID));

Answer 1

您可以通过List.Contains使用此方法：

List<Item> resultList = Items.Where(x => !QueueID.Contains(x.QueueID)).ToList();