C# 使用 Linq 形式和 lambda 形式：如何在数字数组中找到 x 的所有倍数

Question

I am trying to create a Linq query and a linq lambda form which would return all the numbers of an array which would be a multiple of x and y. Let's say 4 and 6. The array would look like this: int[] multiple = (3, 6,, 8, 12, 16, 18, 19, 24, 26);

The actual answer, the linq query, would return: 6, 12, 16, 18, 24 since they all are multiple of 4 and 6 (x and y). In short all numbers who don't equal to zero can be removed or vice versa… Something like that. It would be nice to get both forms.

I am a newbie so all I have yet:

int[] numbers = { 3, 6, 8, 12, 16, 18, 19, 24, 26 };

int[] multipleOf = number.Where((x) => multiple.All((y) => y % x == 0)).ToList();

Answer 1

I'm not sure if you mean are multiples of "both x and y" or "either x and y", however:

int x = 4;
int y = 6;

int[] test = new int[] { 3, 6, 8, 12, 16, 18, 19, 24, 26 };

var test2 = test.Where(i => i % x == 0 || i % y == 0).ToList();

var test3 = (from integer in test
             where integer % x == 0 || integer % y == 0
             select integer).ToList();

Replace "||" in the lambda query with "&&" if it should be both rather than either. I have included ToList() as you appear to be looking for a list, but you could use ToArray() or consume the enumerable another way.