SortedList比较

Question

我有两个分类列表

 1. oldlist<int,int> 

 2. newlist <int,int>

(特定于应用程序的信息-键是industryId，值是权重)

我想比较一下列表中的变化。

我想要以下的东西-

• 重量不是零，但在新列表中为零的项目列表。
• 权重不是零且已从旧列表更改的项目列表。

我知道有一种叫比较器的东西。这里能用吗？

Answer 1

您可以使用Linq：

// list of items where weight was not zero, but its zero in the newlist.
var result1 = from o in oldList
              join n in newList on o.Key equals n.Key 
              where o.Value != 0 && n.Value == 0
              select new {Old = o, New = n};

// list of items where weight is not zero and has changed from oldlist.
var result2 = from o in oldList
              join n in newList on o.Key equals n.Key
              where o.Value != 0 && o.Value != n.Value
              select new { Old = o, New = n };