How do I get two different values from database in C# using linq query?

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want to get id and a value stored against it.
value is in float.
i m trying to sort the value and then show it according to the corresponding id.

What I have tried:

C#

public List<data> GetStuCosineSimilarity()
        {
            Dictionary data = new Dictionary<int,double>();
            List<data> stuId = new List<data>();
            

            data = (from s in DB.Students
                     select new
                     {
                         id = s.StudentId,
                         cosine = s.cosineSimilarity
                     }).ToList();
            return stuId;
        }

Posted 29-Apr-16 23:42pm

Danyal Awan

Updated 30-Apr-16 0:07am

v2

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Karthik_Mahalingam 30-Apr-16 5:51am

What issue you are facing?

1 solution

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Karthik_Mahalingam · Accepted Answer · 2016-04-29T23:56:00

Solution 1

Try this,

Create a class with the properties as

C#

public class Student
   {
       public int Id { get; set; }
       public float Cosine { get; set; }
   }

and your method should be edited as

C#

public List<student> GetStuCosineSimilarity()
        { 
            List<student> lst = new List<student>();

            lst = (from s in DB.Students
                   select new Student()
                   {
                       Id = s.StudentId,
                       Cosine = s.cosineSimilarity
                   }).ToList();

            lst = lst.OrderBy(k => k.Cosine).ToList(); // Sorting the float value
            return lst;
        }

Posted 29-Apr-16 23:56pm

Karthik_Mahalingam

Updated 29-Apr-16 23:57pm

v3

Comments

Danyal Awan 30-Apr-16 6:19am

i have change
public double Cosine { get; set; }

now its giving error on s.cosineSimilarity
(cannot implicitly convert type 'double?' to 'double'. An explicit conversion exists (Are you missing a cast?) )

Karthik_Mahalingam 30-Apr-16 6:22am

Use

public double? Cosine { get; set; }

Danyal Awan 30-Apr-16 6:40am

thanks it worked... :)

Karthik_Mahalingam 30-Apr-16 11:00am

Welcome :)

Danyal Awan 30-Apr-16 9:02am

now how to get only int part from the list in array?

Karthik_Mahalingam 30-Apr-16 10:58am

Means. Only student id list?

Karthik_Mahalingam 30-Apr-16 11:12am

int[] array=Lst.Select(k=> k.Id ).ToList().ToArray();