Get common keys and common values of two dictionaries

Question

Hi I have two dictionaries of next type:

SortedDictionary<string, ClusterPatternCommonMetadata> PatternMetaData { get; set; }

The ClusterPatternCommonMetadata object looks like:

int ChunkQuantity { get; set; }

SortedDictionary<int, int> ChunkOccurrences { get; set; }

First I need the way to find keys of PatternMetaData that is exists in two dictionaries. I find this way:

List<string> commonKeysString=
            vector.PatternMetaData.Keys.Intersect(currentFindingVector.PatternMetaData.Keys)

Then I need to find common values of the founded keys...

Is there is the fast way (lambda, linq, etc) in order to do such operation

Thanks

Are you looking for just matching keys or matching key/values? Related question: http://stackoverflow.com/questions/3804367/testing-for-equality-between-dictionaries-in-c-sharp — deepee1, May 14 '12 at 16:03

AlanFoster · Answer 1 · 2012-05-14T16:00:15.750

15

This is called intersection.

You can get the keys using

var data = dictionary1.Keys.Intersect(dictionary2.Keys)

If you want to find equal keys and values that are contained within both dictionaries then just

var equalDictionarys = dictionary1.Intersect(dictionary2);

edited May 14 '12 at 16:00

answered May 14 '12 at 15:54

AlanFoster

So there is no way to get intersected Dictionary by keys and values from two given dictionaries? – AlexBerd May 14 '12 at 15:56
@AlexanderBerdichevsky Just to clarify.. You want to get all the dictionarys where both key and value match? – AlanFoster May 14 '12 at 15:57
I want to create one dictionary from two that inside of it would the common keys and common values of keys – AlexBerd May 14 '12 at 16:01
1

Yes, this is called intersection :) Try the suggestion in my answer please – AlanFoster May 14 '12 at 16:04

score 6 · Answer 2 · answered Jun 19 '12 at 15:14

6

You can also get the whole Dictionary items which have common keys:

var commonDictionaryItems = Dic1.Where(d => Dic2.ContainsKey(d.Key)).ToList();

answered Jun 19 '12 at 15:14

mashta gidi

2 Answers2