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Entity Framework code first get group by data to list of object


Entity Framework vs LINQ to SQLEntity Framework 4 / POCO - Where to start?How can I get Id of inserted entity in Entity framework?Validation failed for one or more entities while saving changes to SQL Server Database using Entity FrameworkCode-first vs Model/Database-firstFastest Way of Inserting in Entity FrameworkValidation failed for one or more entities. See 'EntityValidationErrors' property for more detailsEntity Framework Provider type could not be loaded?Entity Framework 5 Updating a RecordWhy not inherit from List<T>?













0















How to use Entity Framework code first to get group by data then add to List<object> ?



My code does not seem work:



public IEnumerable<Data> getData()

List<Data> data_cont = new List<Data>();

DataContent db = new DataContent();

// not working code
data_cont = db.MyData.GroupBy(f => f.start_station_num).ToList();

return data_cont;



Why does .GroupBy not work the same as .Where like this



// working code
data_cont = db.MyData.Where(x => x.start_station_num == ""31232"").ToList();









share|improve this question




























    0















    How to use Entity Framework code first to get group by data then add to List<object> ?



    My code does not seem work:



    public IEnumerable<Data> getData()

    List<Data> data_cont = new List<Data>();

    DataContent db = new DataContent();

    // not working code
    data_cont = db.MyData.GroupBy(f => f.start_station_num).ToList();

    return data_cont;



    Why does .GroupBy not work the same as .Where like this



    // working code
    data_cont = db.MyData.Where(x => x.start_station_num == ""31232"").ToList();









    share|improve this question


























      0












      0








      0








      How to use Entity Framework code first to get group by data then add to List<object> ?



      My code does not seem work:



      public IEnumerable<Data> getData()

      List<Data> data_cont = new List<Data>();

      DataContent db = new DataContent();

      // not working code
      data_cont = db.MyData.GroupBy(f => f.start_station_num).ToList();

      return data_cont;



      Why does .GroupBy not work the same as .Where like this



      // working code
      data_cont = db.MyData.Where(x => x.start_station_num == ""31232"").ToList();









      share|improve this question
















      How to use Entity Framework code first to get group by data then add to List<object> ?



      My code does not seem work:



      public IEnumerable<Data> getData()

      List<Data> data_cont = new List<Data>();

      DataContent db = new DataContent();

      // not working code
      data_cont = db.MyData.GroupBy(f => f.start_station_num).ToList();

      return data_cont;



      Why does .GroupBy not work the same as .Where like this



      // working code
      data_cont = db.MyData.Where(x => x.start_station_num == ""31232"").ToList();






      c# entity-framework






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Mar 8 at 5:05









      marc_s

      582k13011231269




      582k13011231269










      asked Mar 8 at 4:37









      Hau LeHau Le

      84




      84






















          1 Answer
          1






          active

          oldest

          votes


















          0














          The reason that code doesn't "work" (ie....it won't even build) is because the GroupBy method returns



          IEnumerable<IGrouping<TKey, TElement> and not an



          IEnumerable<TElement> like the
          Where method does.



          You need to change your variable declaration for data_cont. It should look like this:



          List<IGrouping<string, Data>> data_cont = null;


          Instead of using List like this:



          List<Data> data_cont = new List<Data>();





          share|improve this answer






















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            1 Answer
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            active

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            active

            oldest

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            active

            oldest

            votes









            0














            The reason that code doesn't "work" (ie....it won't even build) is because the GroupBy method returns



            IEnumerable<IGrouping<TKey, TElement> and not an



            IEnumerable<TElement> like the
            Where method does.



            You need to change your variable declaration for data_cont. It should look like this:



            List<IGrouping<string, Data>> data_cont = null;


            Instead of using List like this:



            List<Data> data_cont = new List<Data>();





            share|improve this answer



























              0














              The reason that code doesn't "work" (ie....it won't even build) is because the GroupBy method returns



              IEnumerable<IGrouping<TKey, TElement> and not an



              IEnumerable<TElement> like the
              Where method does.



              You need to change your variable declaration for data_cont. It should look like this:



              List<IGrouping<string, Data>> data_cont = null;


              Instead of using List like this:



              List<Data> data_cont = new List<Data>();





              share|improve this answer

























                0












                0








                0







                The reason that code doesn't "work" (ie....it won't even build) is because the GroupBy method returns



                IEnumerable<IGrouping<TKey, TElement> and not an



                IEnumerable<TElement> like the
                Where method does.



                You need to change your variable declaration for data_cont. It should look like this:



                List<IGrouping<string, Data>> data_cont = null;


                Instead of using List like this:



                List<Data> data_cont = new List<Data>();





                share|improve this answer













                The reason that code doesn't "work" (ie....it won't even build) is because the GroupBy method returns



                IEnumerable<IGrouping<TKey, TElement> and not an



                IEnumerable<TElement> like the
                Where method does.



                You need to change your variable declaration for data_cont. It should look like this:



                List<IGrouping<string, Data>> data_cont = null;


                Instead of using List like this:



                List<Data> data_cont = new List<Data>();






                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Mar 8 at 4:58









                user1011627user1011627

                1,2931119




                1,2931119





























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