问题描述
我有两个结构相同的字典:
I have two dictionaries with the same structure:
Dictionary<string, int> foo = new Dictionary<string, int>()
{
{"Table", 5 },
{"Chair", 3 },
{"Couch", 1 }
};
Dictionary<string, int> bar = new Dictionary<string, int>()
{
{"Table", 4 },
{"Chair", 7 },
{"Couch", 8 }
};
我想将字典的值相加并返回带有键的第三个字典，以及每个键的总值:
I'd like to sum the values of the dictionaries together and return a third dictionaries with the keys, and the total values for each key:
Table, 9
Chair, 10
Couch, 9
我目前的解决方案是遍历字典并以这种方式将它们拉出，但我知道该解决方案不是性能最高或可读性最强的解决方案.但是，我在尝试在 LINQ 中提出解决方案时遇到了困难.
My current solution is to loop through the dictionary and pull them out that way, but I know that solution isn't the most performant or most readable. However, I'm hitting a brick wall trying to come up with a solution in LINQ.
推荐答案
以下不是最有效的解决方案(因为它只是将两个字典都视为可枚举)，但它会起作用并且很清楚:
The following isn't the most efficient solution (because it simply treats both dictionaries as enumerables), but it will work and it is quite clear:
Dictionary<string, int> result = (from e in foo.Concat(bar)
group e by e.Key into g
select new { Name = g.Key, Count = g.Sum(kvp => kvp.Value) })
.ToDictionary(item => item.Name, item => item.Count);
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