how can I select from list with array condition

Question

I want to select from List with array condition

I want to do that

var res = from r in liste where r.id1==array1 ||r.id2==arry1  select r;

the array1 and array2 are arrays contains ids

how can I do that

Answer 1

If you want items in list that have an id1 contained in array1 or an id2 contained in array2 you can do this:

var res = from r in list where array1.Contains(r.id1) || array2.Contains(r.id2) select r;

EDIT: if id1 and id2 are nullable int s:

var res = from r in list 
          where r.id1.HasValue && array1.Contains(r.id1.Value) || 
                r.id2.HasValue && array2.Contains(r.id2.Value) 
          select r;

Answer 2

Where函数还有一个索引参数：

   var res = liste.Where((r, i) => r.id1 == array1[i] || r.id2 == array1[i]);