C# LINQ(8)

           var intArray = new[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11};

            var list = from num in intArray

                       where num > 1&&num<5    
                       
                       let l=Array.IndexOf(intArray, num)

                       select new { List="符合条件:"+num,Loction="当前元素位于数组的索引是"+l};

            foreach (var item in list)

                Console.WriteLine(item);

 select new { List="符合条件:"+num,Loction="当前元素位于数组的索引是"+l};