CODEWITHSUNDEEP
c#.netlinq
NDym
NDym

Reputation: 91

Getting more then one value in the same time from Dictionary

I have 2 dictionaries the first one has a key that are match multiple duplicate values in the second one:

var firstDic = new Dictionary<string, string>();
firstDic.Add("123", "Value1");
firstDic.Add("456", "Value2");
firstDic.Add("789", "Value3");
firstDic.Add("000", "Value4");

var secondDic = new Dictionary<string, string>();
secondDic.Add("5d866ac0-abab-46c9-a951-e7b0cf25dc72", "123");
secondDic.Add("217ddba3-977f-45b8-a7f6-80c6fbcef16e", "123");
secondDic.Add("99867f65-22c1-4b6c-b1bb-3fa73af317a9", "456");
secondDic.Add("203f9cf7-98f8-40fc-a4ba-da3a62c7d795", "456");
secondDic.Add("9bdafb4c-4d5a-4c87-8b9d-d9b98473390a", "789");
secondDic.Add("d3a245f0-cc5b-4c08-aaff-475d64e27e8d", "000");

I have a foreach in which i`m iterating over every key in the first dictionary

foreach (var item in firstDic)
{
   //It`s only taking the first match in the secondDic
   var myKey = secondDic.FirstOrDefault(x => x.Value == item.Key);

}

Is it possible to extract all the keys from the second dictionary(secondDic)that has the values matching from the first dictionary key and store them in some data structure.

Tnx in advice!

Upvotes: 1

Views: 104

Answers (2)

Hossein Narimani Rad
Hossein Narimani Rad

Reputation: 32481

This may help

 var result = secondDic.Where(s => firstDic.Any(f => f.Key == s.Value))
                       .Select(s => s.Key)
                       .ToList();

Upvotes: 0

Ehsan Sajjad
Ehsan Sajjad

Reputation: 62488

Then you don't need to use FirstOrDefault(), just use the Where() which will return a collection back :

 var myKeys = secondDic.Where(x => x.Value == item.Key);

and then you can iterate over it:

foreach(var item in myKeys)
{

}

or do whatever business logic needs to be applied.

Upvotes: 1

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