合并多值字典

dict1 = {'a': 1, 'b': 2}
dict2 = {'c': 3, 'd': 4}
merged_dict = {**dict1, **dict2}

Map<String, Integer> map1 = new HashMap<>();
map1.put("a", 1);
map1.put("b", 2);

Map<String, Integer> map2 = new HashMap<>();
map2.put("c", 3);
map2.put("d", 4);

Map<String, Integer> mergedMap = new HashMap<>(map1);
mergedMap.putAll(map2);

Dictionary<string, int> dict1 = new Dictionary<string, int>
{
    {"a", 1},
    {"b", 2}
};

Dictionary<string, int> dict2 = new Dictionary<string, int>
{
    {"c", 3},
    {"d", 4}
};

Dictionary<string, int> mergedDict = dict1.Concat(dict2)
                                          .ToDictionary(x => x.Key, x => x.Value);