使用LINQ，我如何在一个数组中，在另一个数组中检查一个数字的实例?

I have a list of MyItem objects called myItems like this:

我有一个MyItem对象列表，叫做myItems:

public class MyItem{
    public int[] category_ids;
    public string name;
}

List<MyItem> myItems;

I want to filter down the list of objects with a list of selected categories so that the filtered list contains ANY of the filter category ids:

我想用选定类别的列表来过滤对象列表，这样过滤后的列表就会包含任何筛选类别id:

int[] filter = { 1, 5, 6, 9 };

How would I do that using LINQ in one line? (if its even possible, I cant wrap my head around it!) I imagine something along the lines of:

如何在一行中使用LINQ呢?(如果可能的话，我也不能把我的头绕过去!)我的想象是:

IEnumerable<MyItem> filtered = myItems.Where(item => item.category_ids.Contains(xxx));

3 个解决方案

#1

var filtered = myItems.Where(x => x.category_ids.Intersect(filter)
                                          .Any());

#2

Needs one more method call:

还需要一个方法调用:

IEnumerable<MyItem> filtered = myItems.Where(item => item.category_ids.Any(x=>filter.Contains(x));

#3

Another option than the one already presented:

除了已经提出的备选办法以外，还有一个办法:

var filtered = myItems.Where( item => item.category_ids.Intersect( filter ).Count() > 0 );