List of tuples to list of first elements in that list of tuple C#











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In Dictionary I can get a list of its Key/Values like in the below code:



    Dictionary<string, string> dictionary = new Dictionary<string, string>();

    List<string> list_of_first_elements = new List<string>();

    list_of_first_elements = new List<string> (dictionary.Keys);


Is there an attribute/method can do same with List<Tuple> without looping over the list and add its first/second elements? Something like that:



        List<Tuple<string, string>> list_of_tuples = new List<Tuple<string, string>>();

        list_of_first_elements = """SomeCode""";





c#







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  • 4




    Using Linq: list_of_first_elements = list_of_tuples.Select(_ => _.Item1).ToList()
    – Klaus Gütter
    Nov 10 at 15:17






  • 2




    There's no such method. You can use LINQ, but it will still enumerate all elements, which is essentially a loop.
    – 2kay
    Nov 10 at 15:20












  • Thank you guys!
    – Ahmed Salah
    Nov 10 at 15:26






  • 1




    In terms of performance it will be nearly the same. So I prefer LINQ as it seems more clear.
    – 2kay
    Nov 10 at 15:27

















up vote
0
down vote

favorite












In Dictionary I can get a list of its Key/Values like in the below code:



    Dictionary<string, string> dictionary = new Dictionary<string, string>();

    List<string> list_of_first_elements = new List<string>();

    list_of_first_elements = new List<string> (dictionary.Keys);


Is there an attribute/method can do same with List<Tuple> without looping over the list and add its first/second elements? Something like that:



        List<Tuple<string, string>> list_of_tuples = new List<Tuple<string, string>>();

        list_of_first_elements = """SomeCode""";





c#







share|improve this question


















  • 4




    Using Linq: list_of_first_elements = list_of_tuples.Select(_ => _.Item1).ToList()
    – Klaus Gütter
    Nov 10 at 15:17






  • 2




    There's no such method. You can use LINQ, but it will still enumerate all elements, which is essentially a loop.
    – 2kay
    Nov 10 at 15:20












  • Thank you guys!
    – Ahmed Salah
    Nov 10 at 15:26






  • 1




    In terms of performance it will be nearly the same. So I prefer LINQ as it seems more clear.
    – 2kay
    Nov 10 at 15:27















up vote
0
down vote

favorite









up vote
0
down vote

favorite











In Dictionary I can get a list of its Key/Values like in the below code:



    Dictionary<string, string> dictionary = new Dictionary<string, string>();

    List<string> list_of_first_elements = new List<string>();

    list_of_first_elements = new List<string> (dictionary.Keys);


Is there an attribute/method can do same with List<Tuple> without looping over the list and add its first/second elements? Something like that:



        List<Tuple<string, string>> list_of_tuples = new List<Tuple<string, string>>();

        list_of_first_elements = """SomeCode""";





c#







share|improve this question













In Dictionary I can get a list of its Key/Values like in the below code:



    Dictionary<string, string> dictionary = new Dictionary<string, string>();

    List<string> list_of_first_elements = new List<string>();

    list_of_first_elements = new List<string> (dictionary.Keys);


Is there an attribute/method can do same with List<Tuple> without looping over the list and add its first/second elements? Something like that:



        List<Tuple<string, string>> list_of_tuples = new List<Tuple<string, string>>();

        list_of_first_elements = """SomeCode""";





c#




c#






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asked Nov 10 at 15:14









Ahmed Salah

1691213




1691213








  • 4




    Using Linq: list_of_first_elements = list_of_tuples.Select(_ => _.Item1).ToList()
    – Klaus Gütter
    Nov 10 at 15:17






  • 2




    There's no such method. You can use LINQ, but it will still enumerate all elements, which is essentially a loop.
    – 2kay
    Nov 10 at 15:20












  • Thank you guys!
    – Ahmed Salah
    Nov 10 at 15:26






  • 1




    In terms of performance it will be nearly the same. So I prefer LINQ as it seems more clear.
    – 2kay
    Nov 10 at 15:27
















  • 4




    Using Linq: list_of_first_elements = list_of_tuples.Select(_ => _.Item1).ToList()
    – Klaus Gütter
    Nov 10 at 15:17






  • 2




    There's no such method. You can use LINQ, but it will still enumerate all elements, which is essentially a loop.
    – 2kay
    Nov 10 at 15:20












  • Thank you guys!
    – Ahmed Salah
    Nov 10 at 15:26






  • 1




    In terms of performance it will be nearly the same. So I prefer LINQ as it seems more clear.
    – 2kay
    Nov 10 at 15:27










4




4




Using Linq: list_of_first_elements = list_of_tuples.Select(_ => _.Item1).ToList()
– Klaus Gütter
Nov 10 at 15:17




Using Linq: list_of_first_elements = list_of_tuples.Select(_ => _.Item1).ToList()
– Klaus Gütter
Nov 10 at 15:17




2




2




There's no such method. You can use LINQ, but it will still enumerate all elements, which is essentially a loop.
– 2kay
Nov 10 at 15:20






There's no such method. You can use LINQ, but it will still enumerate all elements, which is essentially a loop.
– 2kay
Nov 10 at 15:20














Thank you guys!
– Ahmed Salah
Nov 10 at 15:26




Thank you guys!
– Ahmed Salah
Nov 10 at 15:26




1




1




In terms of performance it will be nearly the same. So I prefer LINQ as it seems more clear.
– 2kay
Nov 10 at 15:27






In terms of performance it will be nearly the same. So I prefer LINQ as it seems more clear.
– 2kay
Nov 10 at 15:27














1 Answer
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As @KlausGütter and @2kay mentioned I used LINQ to do that and its performance is nearly to looping over the List but it's certainly more clear, and here is the code:



list_of_first_elements = list_of_tuples.Select(_ => _.Item1).ToList();





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    active

    oldest

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    active

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    up vote
    1
    down vote



    accepted










    As @KlausGütter and @2kay mentioned I used LINQ to do that and its performance is nearly to looping over the List but it's certainly more clear, and here is the code:



    list_of_first_elements = list_of_tuples.Select(_ => _.Item1).ToList();





    share|improve this answer

























      up vote
      1
      down vote



      accepted










      As @KlausGütter and @2kay mentioned I used LINQ to do that and its performance is nearly to looping over the List but it's certainly more clear, and here is the code:



      list_of_first_elements = list_of_tuples.Select(_ => _.Item1).ToList();





      share|improve this answer























        up vote
        1
        down vote



        accepted







        up vote
        1
        down vote



        accepted






        As @KlausGütter and @2kay mentioned I used LINQ to do that and its performance is nearly to looping over the List but it's certainly more clear, and here is the code:



        list_of_first_elements = list_of_tuples.Select(_ => _.Item1).ToList();





        share|improve this answer












        As @KlausGütter and @2kay mentioned I used LINQ to do that and its performance is nearly to looping over the List but it's certainly more clear, and here is the code:



        list_of_first_elements = list_of_tuples.Select(_ => _.Item1).ToList();






        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Nov 10 at 15:46









        Ahmed Salah

        1691213




        1691213






























             

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