Get a Join on Two Dictionaries with different Datatypes in C#

Question

I have two dictionaries, namely

Dictionary DictA=new Dictionary();
Dictionary DictB=new Dictiona         


        

Answer 1

DictA.Join(DictB, 
           a => a.Key,
           b => b.Key,
           (a,b) => new KeyValuePair<int,string>(b.Value,a.Key))
    .ToDictionary(x => x.Key, x => x.Value);

Answer 2

Very simple:

var query =
    DictA
        .Where(a => DictB.ContainsKey(a.Key))
        .ToDictionary(a => DictB[a.Key], a => a.Value);

I get this result: