Nested lmbda expression to find or remove repeated collection item within a few lines 利用嵌套lambda表达式快速查找或移除重复集合项

gistfile1.cs

List<string> listA = new List<string>(){"1","2","3","4"};
List<string> listB = new List<string>(){"1","3","5"};

List<string> listAWithoutRepeatedItemsInListB =  listA.RemoveAll(objA=>(listB.Exist(objB=>objB==objA)));
//result: "2","4"

List<string> listAllDiffItems = new List<string>();
listAllDiffItems.AddRange(ListA.FindAll(objA=>(!listB.Exist(objB=>objB==objA))));
listAllDiffItems.AddRange(ListB.FindAll(objB=>(!listA.Exist(objA=>objA==objB))));
//result: "2","4","5"