比较两个列表

Question

Both List A and List

List A = new List(); List B = new List();

For the sake of simplicity, I have mentioned the Products in each List. Te numbers here are referring to the Product ID.

  List A contains 1,2,3,4,5

  List B contains 1,2,3,4,5,6,7

I want to know the code in c# asp.net that will compare the two lists, and synchronizing them. Meaning if List B had some more Products (lets say 19,20) it copy 19,20 to List A.

Lets say it was a List, how would I compare the qty attribute. I have to check if the same product ID is in both lists. Then it would check the qty attribute. It would synch them both.

Answer 1

List<T> result = firstList.Except(secondList).ToList()

而且您可能需要在类上实现EqualityComparer<T>以确保对象的相等性。

Answer 2

不确定这是否是最有效的解决方案（我确信必须有更好的Linq方法）...

c = A.Except(B).Union(B.Except(A)).ToList();