![C# 交集 差集 并集 C# 交集 差集 并集](https://image.shishitao.com:8440/aHR0cHM6Ly9ia3FzaW1nLmlrYWZhbi5jb20vdXBsb2FkL2NoYXRncHQtcy5wbmc%2FIQ%3D%3D.png?!?w=700&webp=1)
Intersect 交集,Except 差集,Union 并集
int[] oldArray = { , , , , };
int[] newArray = { , , , , , };
var jiaoJi = oldArray.Intersect(newArray).ToList();//2,4,5 交集
var oldChaJi = oldArray.Except(newArray).ToList();//1,3 差集
var newChaJi = newArray.Except(oldArray).ToList();//7,8,9 差集
var bingJi = oldArray.Union(newArray).ToList();//1,2,3,4,5,7,8,9 并集