如何结合2个字典

Question

可能重复:
在C#中合并字典

使用c#4有2个类型的字典

<string,List<int>>



dictionary1 = [ { "key1" , [ 1, 2, 3]} ,
                 { "key2" , [ 1, 2, 4 , 6]}
              ]

我想与dictionary2结合

dictionary2 = [ { "key0" , [ 1, 2, 3]} ,
                 { "key2" , [ 1, 2, 3, 5 , 6]} 
              ]

所以得到=>

dictionary1 + dictionary2  = [ { "key1" , [ 1, 2, 3]} ,
                 { "key2" , [ 1, 2, 3, 4, 5, 6]},
                 { "key0" , [ 1, 2, 3]}
              ]

我该怎么做 ？

Answer 1

一个简单的循环Enumerable.Union？:

foreach (var kv in dictionary2)
{
    List<int> values;
    if (dictionary1.TryGetValue(kv.Key, out values))
    {
        dictionary1[kv.Key] = values.Union(kv.Value).ToList();
    }
    else
    {
        dictionary1.Add(kv.Key, kv.Value);
    }
}