349.求两个数组的交集 Intersection of Two Arrays

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public int[] Intersection(int[] nums1, int[] nums2) {
	List<int> l = new List<int>();
	List<int> sameList = new List<int>();
	int length = nums1.Length;
	for (int i = 0; i < length; i++) {
		l.Add(nums1[i]);
	}
	length = nums2.Length;
	int num = 0;
	for (int i = 0; i < length; i++) {
		num = nums2[i];
		if (l.Contains(num) && !sameList.Contains(num)) {
			sameList.Add(num);
		}
	}
	int [] list = sameList.ToArray();
	return list;
}