public static void PrintAllStudentsWithInclude(EducationalContext context)
{
try
{
foreach (var s in context.Students.Include(x => x.Enrollments.Select(c => c.Course)))
{
PrintStudent(s);
}
}
catch (Exception e)
{
Console.WriteLine("message: " + e.Message);
Console.WriteLine("inner exception messag: " + e.InnerException.Message);
}
}
public static void SearchStudentWithEntry(string firstmidname, EducationalContext context)
{
if (context.Students.Where(s => s.FirstMidName == firstmidname).FirstOrDefault() == null)
{
Console.WriteLine("No student found");
}
else
{
Student student = context.Students
.Where(s => s.FirstMidName == firstmidname)
.FirstOrDefault();
context.Entry(student).Collection(e => e.Enrollments).Load();
PrintStudent(student);
}
}
public static void SearchStudentWithInclude(string firstmidname, EducationalContext context)
{
if (context.Students.Where(s => s.FirstMidName == firstmidname).FirstOrDefault() == null)
{
Console.WriteLine("No student found");
}
else
{
Student student = context.Students
.Where(s => s.FirstMidName == firstmidname)
.Include(x => x.Enrollments.Select(c => c.Course))
.FirstOrDefault();
PrintStudent(student);
}
}
public static void PrintAllStudentsWithEntry(EducationalContext context)
{
try
{
List <Student> students = context.Students.ToList();
foreach (Student s in students)
{
context.Entry(s).Collection(e => e.Enrollments).Load();
PrintStudent(s);
}
}
catch (Exception e)
{
Console.WriteLine("message: " + e.Message);
Console.WriteLine("inner exception messag: " + e.InnerException.Message);
}
}
static void Main(string[] args)
{
Database.SetInitializer(new DropCreateDatabaseAlways <EducationalContext>());
GenerateStudents();
using (EducationalContext context = new EducationalContext())
{
context.Configuration.LazyLoadingEnabled = false; //disable lazy loading
Console.WriteLine("We are making an explicit loading"); //print line
PrintAllStudentsWithInclude(context); //print all students, by iterating over context students and using include for the associated data
PrintAllStudentsWithEntry(context); //print all students and associated data with the entry load method
Console.WriteLine("Search for a student (include). Enter firstname >> "); //search for specific student using include method of DbSet<>
SearchStudentWithInclude(Console.ReadLine(), context);
Console.WriteLine("Search for a student (entry). Enter firstname >> ");//search for specific student using entry and Load method
SearchStudentWithEntry(Console.ReadLine(), context);
}
}
public static void GenerateStudents()
{
Course EntityFrameworkCourse = new Course()
{
CourseName = "Entity Framework", Credits = 50
};
Course DotNetFrameworkCourse = new Course()
{
CourseName = ".NET Framework", Credits = 50
};
Course JavascriptCourse = new Course()
{
CourseName = "Javascript", Credits = 50
};
Course BasicAlgorithms = new Course()
{
CourseName = "Basic Algorithms", Credits = 50
};
Course HttpCourse = new Course()
{
CourseName = "Http", Credits = 100
};
Course SecurityManagementCourse = new Course()
{
CourseName = "Security Management", Credits = 50
};
Student student1 = new Student()
{
FirstMidName = "Ivan", LastName = "Prgomet", EnrollmentDate = new DateTime(2015, 12, 24)
};
student1.Enrollments = new List <Enrollment>
{
new Enrollment()
{
EnrollmentName = "Webdeveloper within .NET",
Course = EntityFrameworkCourse,
Grade = "A-F"
},
new Enrollment()
{
EnrollmentName = "Webdeveloper within .NET",
Course = DotNetFrameworkCourse,
Grade = "A-F"
},
new Enrollment()
{
EnrollmentName = "Webdeveloper within .NET",
Course = JavascriptCourse,
Grade = "A-F"
},
new Enrollment()
{
EnrollmentName = "Webdeveloper within .NET",
Course = BasicAlgorithms,
Grade = "A,F"
},
};
Student student2 = new Student()
{
FirstMidName = "Lea", LastName = "Winchester", EnrollmentDate = new DateTime(2015, 12, 24)
};
student2.Enrollments = new List <Enrollment>
{
new Enrollment()
{
EnrollmentName = "Webdeveloper within .NET",
Course = EntityFrameworkCourse,
Grade = "A-F"
},
new Enrollment()
{
EnrollmentName = "Webdeveloper within .NET",
Course = DotNetFrameworkCourse,
Grade = "A-F"
},
new Enrollment()
{
EnrollmentName = "Webdeveloper within .NET",
Course = JavascriptCourse,
Grade = "A-F"
},
};
Student student3 = new Student()
{
FirstMidName = "Jason", LastName = "Bourne", EnrollmentDate = new DateTime(2016, 12, 24)
};
student3.Enrollments = new List <Enrollment>
{
new Enrollment()
{
EnrollmentName = "Network Security",
Course = HttpCourse,
Grade = "A,F"
},
new Enrollment()
{
EnrollmentName = "Network Security",
Course = SecurityManagementCourse,
Grade = "A-C"
},
};
using (EducationalContext context = new EducationalContext())
{
//context.Configuration.LazyLoadingEnabled = false;
context.Students.Add(student1);
context.Students.Add(student2);
context.Students.Add(student3);
context.Database.Log = Console.WriteLine;
context.SaveChanges();
}
//PRINT THE STUDENTS
List <Student> students = new List <Student>()
{
student1, student2, student3
};
foreach (var student in students)
{
PrintStudent(student);
}
}
