👩‍💻 聯集

取得兩個 list 得聯集

void Main()
{
 List<int> A = new List<int>(){1,2,3,5,7};
 List<int> B = new List<int>(){2,3,4,5,6,7};
 List<int> C = new List<int>(){2,3,4,5,6,7,9,10,11,12};
 A = A.Union(B).ToList();
 A.OrderBy(x => x).Dump();
 A = A.Union(C).ToList();
 A.OrderBy(x => x).Dump();
}