How can I use LINQ with joins in ASP.NET Core?

How can I use LINQ with joins in ASP.NET Core?

You can use LINQ to perform joins in ASP.NET Core by utilizing the Join method or the query syntax. Would you like an example?

Yes, please provide an example of using joins with LINQ.

Sure! Here's a simple example:

var result = from student in context.Students
             join enrollment in context.Enrollments
             on student.Id equals enrollment.StudentId
             select new {
                 StudentName = student.Name,
                 Course = enrollment.Course.Name
             };

This will give you a list of students along with their enrolled courses.

What if I want to include students who are not enrolled in any course?

In that case, you can use a left join. Here's how you can do it:

var result = from student in context.Students
             join enrollment in context.Enrollments
             on student.Id equals enrollment.StudentId into enrollmentsGroup
             from enrollment in enrollmentsGroup.DefaultIfEmpty()
             select new {
                 StudentName = student.Name,
                 Course = enrollment != null ? enrollment.Course.Name : "No Course"
             };