c# Programming Glossary: teacherUnhandled Exception after Upgrading to Entity Framework 4.3.1 http://stackoverflow.com/questions/10441924/unhandled-exception-after-upgrading-to-entity-framework-4-3-1 public string Student get set public string Teacher get set public virtual ICollection Cancellation Cancellations.. Lesson public DateTime Date get set public string Teacher get set public virtual Cancellation Cancellation get set Configuration..
LINQ: From a list of type T, retrieve only objects of a certain subclass S http://stackoverflow.com/questions/1184944/linq-from-a-list-of-type-t-retrieve-only-objects-of-a-certain-subclass-s S Given a simple inheritance hierarchy Person Student Teacher Staff Say I have a list of Persons L. In that list are some.. I have a list of Persons L. In that list are some Students Teachers and Staff. Using LINQ and C# is there a way I could write a.. I know I can do something like var peopleIWant L.OfType Teacher But I want to be able to do something more dynamic. I would..
Covariance and contravariance real world example http://stackoverflow.com/questions/2662369/covariance-and-contravariance-real-world-example you have a class Person and a class that derives from it Teacher. You have some operations that take an IEnumerable Person as.. School class you have a method that returns an IEnumerable Teacher . Covariance allows you to directly use that result for the.. an IEnumerable Person . public class Person public class Teacher Person public class MailingList public void Add IEnumerable..
Difference between association, aggregation and composition http://stackoverflow.com/questions/885937/difference-between-association-aggregation-and-composition lifecycle and there is no owner. Let 䏭 take an example of Teacher and Student. Multiple students can associate with single teacher..
LINQ: From a list of type T, retrieve only objects of a certain subclass S http://stackoverflow.com/questions/1184944/linq-from-a-list-of-type-t-retrieve-only-objects-of-a-certain-subclass-s IList Student students GetPersons Student IList Teacher teacher GetPersons Teacher EDIT added the where constraint. share improve..
How to do a full outer join in Linq? http://stackoverflow.com/questions/2085422/how-to-do-a-full-outer-join-in-linq he attended and a StudentTeacher table that stores all the teachers who taught this student. Yes I know it's a dumb design and.. a dumb design and it would make more sense to store the teacher on the Class table but that's what we're working with. I now.. and I want to find all the places where a student has a teacher but no classes or a class but no teachers. SQL thus select from..
Difference between association, aggregation and composition http://stackoverflow.com/questions/885937/difference-between-association-aggregation-and-composition and Student. Multiple students can associate with single teacher and single student can associate with multiple teachers but.. teacher and single student can associate with multiple teachers but there is no ownership between the objects and both have.. parent object. Let 䏭 take an example of Department and teacher. A single teacher can not belongs to multiple departments but..
Different between Task (System.Threading.Task) and Thread http://stackoverflow.com/questions/9493421/different-between-task-system-threading-task-and-thread of threads doing stuff is inefficient. Imagine if your teacher gave you 10 000 tasks to do. You'd spend so much time cycling..
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