.net - TPL dataflow preserving input -


i using .net tpl dataflow operation. using match list of resumes job category. final block gives me matched resumes/candidates. want associate matched candidate initial input category. have find list of matching candidates list of job categories. however, unable preserve original input. want final output this

{category, list< matchedcandidates >} 1 category if searching mutiple categories, want output be

list of {category, list< matchedcandidates >}

here code:

    var transformblock = new transformblock<int, category_keywordstomatch>(x =>         {             return getkeywordstomatch(x);         });          var matchedcandidates_dataflow = new list<matchedcandidate>();          var finalblock = new actionblock<category_keywordstomatch>(x =>         {             list<resume> resumes = new list<resume>();              using (var context = new indepthrecruitdbcontext())             {                 resumes = context.resumes.include("candidate").tolist();             }             foreach (var res in resumes)             {                 var keywords = findkeywords(x.keywordstomatch, res);                 if (keywords.count > 0)                 {                     matchedcandidates_dataflow.add(new matchedcandidate                     {                         id = res.candidateid,                         name = res.candidate.name,                         url = res.url,                         uploaded = res.dateuploaded.toshortdatestring(),                         matchedkeywordslist = keywords                     });                 }             }         });          var linkoptions = new dataflowlinkoptions { propagatecompletion = true };          transformblock.linkto(finalblock, linkoptions);         transformblock.post(1);         transformblock.complete();         finalblock.completion.wait();


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