LINQ的集合运算

List<int> lstOne = new List<int>() { 1, 55, 223, 25 };

List<int> lstTwo = new List<int>() { 54, 22, 56, 1, 25 };

var Intersect = lstOne.Intersect(lstTwo);//计算lstOne和lstTwo两个集合的交集{1,25}

var Union = lstOne.Union(lstTwo);//计算lstOne和lstTwo两个集合的并集{1,55,223,25,54,22,56}

var Except = lstOne.Except(lstTwo);//计算lstOne与lstTwo的差集{55,223}

Except = lstTwo.Except(lstOne);//计算lstTwo与lstOne的差集{54,22,56}

var repeat = Enumerable.Repeat<int>(110, 10);//生成一个序列，其中包含一个重复的值{110,110,110,110,110,110,110,110,110,110}

var Reverse = lstTwo.Reverse<int>();//反转序列中元素的顺序。{25,1,56,22,54}