c# - Error on CSV to Dictionary -

-

not sure why isn't working, it's adapted code work. looks need explicit cast i'm not sure why or put it. error is:

"cannot implicitly convert type 'system.collections.generic.ienumerable{system.collections.generic.dictionary{string,string}}' 'system.collections.generic.dictionary{string,string}'"

    public static dictionary<string, string> data_entry(string dataentity, string datacategory, string datastream = "")     {         var lines = file.readalllines(@"c:\myfile.csv");         var header = lines.first().split(',');         return (from line in lines.skip(1)             let cols = line.split(',')             cols[0].toupper() == dataentity & cols[1].toupper() == datacategory & cols[4].toupper() == datastream             select header.select((h, i) => new { header = h, index = })             .todictionary(o => o.header, o => cols[o.index])         );     }

your linq query returning ienumerable<t> object t of type dictionary instead of expecting dictionary.

if understand code want create list of dictionaries column header key , line's column index value value. since dictionaries cannot have duplicate keys, can't turn entire thing 1 dictionary object there exceptions duplicate keys.

so want pull todictionary() call out of linq statement , apply result of linq statement instead dictionary. unfortunately, result in said duplicate key errors way it's coded instead of returning dictionary might consider different datastructure or change return type ienumerable<dictionary<string,string>> type.

edit: based on follow-up information in comments following need be. notice added firstordefault() call results of linq query. means return first result (which type dictionary<string,string>) satisfies method's return type. it's worth having check in calling code null return in case if you're confident never null.

public static dictionary<string, string> data_entry(string dataentity, string datacategory, string datastream = "") {     var lines = file.readalllines(@"c:\myfile.csv");     var header = lines.first().split(',');     return (from line in lines.skip(1)         let cols = line.split(',')         cols[0].toupper() == dataentity & cols[1].toupper() == datacategory & cols[4].toupper() == datastream         select header.select((h, i) => new { header = h, index = })         .todictionary(o => o.header, o => cols[o.index])     ).firstordefault(); }

Comments

Post a Comment

Popular posts from this blog

Django REST Framework perform_create: You cannot call `.save()` after accessing `serializer.data` -

-
i have following viewset: class artistprofileviewset(viewsets.modelviewset): queryset = artistprofile.objects.all() serializer_class = artistprofileserializer def perform_create(self, serializer): if serializer.is_valid(): serializer.save() with following serializers: class simpleartisttrackserializer(serializers.hyperlinkedmodelserializer): class meta: model = artisttrack fields = (...my fields...) class artistprofileserializer(serializers.hyperlinkedmodelserializer): owners = userserializer(many=true, required=false) tracks = simpleartisttrackserializer(many=true, required=false) class meta: model = artistprofile fields = (...my fields...) i getting following error: assertionerror: cannot call `.save()` after accessing `serializer.data`.if need access data before committing database inspect 'serializer.validated_data' instead. i don't see editing serializer.data object. th...
Read more

Why does Go error when trying to marshal this JSON? -

-
i'm trying rather simple example of trying decode json file structs using golang. however, when attempting error that json: cannot unmarshal object go value of type []main.track which don't understand. here's code in question, , json can found here . package main import ( "encoding/json" "fmt" "net/http" "os" ) // tracks group of track types type tracks struct { tracks []track } // track represents singular track type track struct { name string url string artist artist } // artist represents single artist type artist struct { name string mbid string url string } func main() { url := "http://ws.audioscrobbler.com/2.0/?method=geo.gettoptracks&api_key=c1572082105bd40d247836b5c1819623&format=json&country=netherlands" response, err := http.get(url) if err != nil { fmt.printf("%s\n", err) os.exit(1) } de...
Read more