直接留代码案例:
/*
* Intersect 交集
* Except 差集
* Union 并集
*/
int[] oldArray = { 1, 2 };
int[] newArray = { 1, 2, 2, 3, 4, 5 };
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();//1,2,3,4,5,7,8,9
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