linq to object get element from list

Question

List<PrpSubjects> objListSubjects  = _objSubjectDal.GetAllSubjects();
ddlSubjects.DataSource = objListSubjects;
ddlSubjects.DataBind();

_subjectName = objListSubjects...?

In _subjectName I want to fetch the subjectname from objListSubjects on basis of subjectid. The subject list has subjectid and subjectname columns.

the question is i have a list with 2 columns subjectid,subjectname... the method returns a list of subject now i want to fetch the subjectname by subjectid,,, i thght instead of querying the database again i thght to use linq on list to fetch the subject name.. i hope i am clear about my requirement

dropdown... the question is i have a list<Subject> with 2 columns subjectid,subjectname... the method returns a list of subject now i want to fetch the subjectname by subjectid,,, i thght instead of querying the database again i thght to use linq on list to fetch the subject name.. i hope i am clear about my requirement — lsharma
– lsharma, Commented May 23, 2011 at 9:22

Thomas Levesque · Accepted Answer · 2011-05-23 09:25:33Z

2

_subjectName = objListSubjects
               .Where(s => s.SubjectId == someId)
               .Select(s => s.SubjectName)
               .FirstOrDefault();

(will return null if there is no subject with the id someId)

edited May 23, 2011 at 9:25

answered May 23, 2011 at 9:20

Thomas Levesque

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Botz3000 · Accepted Answer · 2011-05-23 09:22:23Z

0

_subjectName = objListSubjects.First(s => s.SubjectID == theIdYouAlreadyHave).SubjectName;

If you suspect that subject might not exist, you can use

objListSubjects.FirstOrDefault(s => s.SubjectID == id);

That will return null if it doesn't exist.

answered May 23, 2011 at 9:22

Botz3000

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BitKFu · Accepted Answer · 2011-05-23 09:25:50Z

0

Or, if you find the sql style better to read ;)

_subjectName = (from s in objListSubjects 
               where s.SubjectId == someId 
               select s.SubjectName).FirstOrDefault();

answered May 23, 2011 at 9:25

BitKFu

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