, , , , }; , , , , , }; var jiaoJi = oldArray.Intersect(newArray).ToList();//2,4,5 var oldChaJi = oldArray.Except(newArray).ToList();//1,3 var newChaJi = newArray.Except(oldArray).ToList();//7,8,9 var bingJi = oldArray.Union(newArray).ToList();//1,2,…