Regarding a EF linq query

Question

User1183902823 posted

see the below code

using (var context = new SchoolDBEntities())
{
    var stud1 = (from s in context.Students.Include("Standard")
                where s.StudentName == "Student1"
                select s).FirstOrDefault<Student>();
}

tell me why we need to specify studen inside firstordefault like FirstOrDefault<Student>() ?

if i write like this way then it will not work ?

using (var context = new SchoolDBEntities())
{
    var stud1 = (from s in context.Students.Include("Standard")
                where s.StudentName == "Student1"
                select s).FirstOrDefault();
}

Answer 1

User991499041 posted

Hi Tridip1974,

You can simplify the FirstOrDefault<Student>() to FirstOrDefault(), they're exactly the same.

Regards,

zxj

Answer 2

User-707554951 posted

Hi tridip1974, 

tridip1974

tell me why we need to specify studen inside firstordefault like FirstOrDefault<Student>() ?

Specify the type of the elements of source. If we not specify Student in this method, The default type of return is Student ,

So, You second piece of code will perform as same as first one.

For this you could see the picture below:

Related links:

https://msdn.microsoft.com/en-us/library/bb340482(v=vs.110).aspx

Best regards 

Cathy