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

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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();

c# entity-framework

share|improve this question

edited Mar 8 at 5:05

marc_s

582k13011231269

asked Mar 8 at 4:37

Hau LeHau Le

84

add a comment | 

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();

c# entity-framework

share|improve this question

edited Mar 8 at 5:05

marc_s

582k13011231269

asked Mar 8 at 4:37

Hau LeHau Le

84

add a comment | 

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

edited Mar 8 at 5:05

marc_s

582k13011231269

asked Mar 8 at 4:37

Hau LeHau Le

84

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;

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

share|improve this question

edited Mar 8 at 5:05

marc_s

582k13011231269

asked Mar 8 at 4:37

Hau LeHau Le

84

share|improve this question

edited Mar 8 at 5:05

marc_s

582k13011231269

asked Mar 8 at 4:37

Hau LeHau Le

84

edited Mar 8 at 5:05

marc_s

582k13011231269

edited Mar 8 at 5:05

marc_s

582k13011231269

asked Mar 8 at 4:37

Hau LeHau Le

84

asked Mar 8 at 4:37

Hau LeHau Le

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

answered Mar 8 at 4:58

user1011627user1011627

1,2931119

add a comment | 

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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

answered Mar 8 at 4:58

user1011627user1011627

1,2931119

add a comment | 

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

answered Mar 8 at 4:58

user1011627user1011627

1,2931119

add a comment | 

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

answered Mar 8 at 4:58

user1011627user1011627

1,2931119

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

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

share|improve this answer

answered Mar 8 at 4:58

user1011627user1011627

1,2931119

answered Mar 8 at 4:58

user1011627user1011627

1,2931119

answered Mar 8 at 4:58

user1011627user1011627

1,2931119