Question

I have 4 dictionaries of type

Dictionary<string,string>

dict1

k1 = v1
k2 = v2
k4 = v4

dict 2

k2 = vv2
k3 = v3


dict3
k2 = vvv2

dict 4

k4 = vvvv4

result dict of type Dictionary<string,List<string>>

k1 = v1,"","","" //combine 4 dict but put blank values in respective positions where values are not found
k2 = v2,vv2,vvv2,""
k3 = "",v3,"",""
k4 = v4,"","",vvvv4

Is this achievable? Any extension method??

Answer 1

Not inbuilt; but maybe something like:

var keys = dict1.Keys.Union(dict2.Keys).Union(dict3.Keys).Union(dict4.Keys);
var result = new Dictionary<string,List<string>>();
foreach(var key in keys) {
    List<string> list = new List<string>();
    list.Add(dict1.ContainsKey(key) ? dict1[key] : "");
    list.Add(dict2.ContainsKey(key) ? dict2[key] : "");
    list.Add(dict3.ContainsKey(key) ? dict3[key] : "");
    list.Add(dict4.ContainsKey(key) ? dict4[key] : "");
    result.Add(key, list);
}