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GeneralRe: C# GDI+ simulation of inclined plane Pin
Member 1268837717-Aug-16 0:58
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GeneralRe: C# GDI+ simulation of inclined plane Pin
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GeneralRe: C# GDI+ simulation of inclined plane Pin
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GeneralRe: C# GDI+ simulation of inclined plane Pin
Gerry Schmitz16-Aug-16 6:42
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AnswerRe: C# GDI+ simulation of inclined plane Pin
Gerry Schmitz16-Aug-16 6:30
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GeneralRe: C# GDI+ simulation of inclined plane Pin
Member 1268837716-Aug-16 6:40
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AnswerRe: C# GDI+ simulation of inclined plane Pin
patbob18-Aug-16 11:35
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QuestionC#: what is the usage of virtual keyword in Entity Framework Pin
Tridip Bhattacharjee16-Aug-16 2:32
professionalTridip Bhattacharjee16-Aug-16 2:32 
in many mvc application i have seen people use virtual keyword. i like to know the reason.

i have seen a video from this url https://www.youtube.com/watch?v=BSgAA8y5ViU which generate UI from model with scaffolding

so see this code first
C#
public class Student
{
    public int StudentId;
    public string StudentName;
    public int CourseId;
    public virtual Course Courses { get; set; }
}

public class Course
{
    public int CourseId;
    public string CourseName;
    public string Description;
    public ICollection<Student> Students {get;set;}
    public ICollection<Lecture> Lectures { get; set; }
}

public class Lecture
{
    public int LectureId;
    public string LectureName;
    public int CourseId;
    public virtual Course Courses { get; set; }
}


1) why lecture and student class has common property called CourseId ?

2) see below code
C#
public ICollection<Student> Students {get;set;}
public ICollection<Lecture> Lectures { get; set; }


why they use ICollection ? they can use here list etc ?

3) why Courses property has been declared with virtual keyword in lecture and student class ?

please help me to understand the real use of virtual keyword

public virtual Course Courses { get; set; }

in what kind of scenario we use virtual keyword ? what is advantage ?

please explain the reason why people use virtual keyword with EF ?

thanks
tbhattacharjee

AnswerRe: C#: what is the usage of virtual keyword in Entity Framework Pin
Richard MacCutchan16-Aug-16 3:02
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AnswerRe: C#: what is the usage of virtual keyword in Entity Framework Pin
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AnswerRe: C#: what is the usage of virtual keyword in Entity Framework Pin
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