private static void ListAllCoursesWhichWereActiveOnGivenDate(StudentsContext context, DateTime targetDate)
{
var courses = context.Courses
.Where(c => targetDate <= c.StartDate && targetDate <= c.EndDate)
.Select(c => new
{
Name = c.Name,
StartDate = c.StartDate,
EndDate = c.EndDate,
CourseDuration = SqlFunctions.DateDiff("day", c.StartDate, c.EndDate),
NumberOfStudentsEnrolled = c.Students.Count
})
.OrderByDescending(c => c.NumberOfStudentsEnrolled)
.ThenByDescending(c => c.CourseDuration)
.ToList();
StringBuilder content = new StringBuilder();
foreach (var course in courses)
{
content.AppendFormat("{0} {1} {2} {3} - {4}{5}",
course.Name,
course.StartDate,
course.EndDate,
course.CourseDuration,
course.NumberOfStudentsEnrolled,
Environment.NewLine);
}
Console.Write(content);
}
private static void AllCoursesActiveOnGivenDate(StudentsContext context)
{
DateTime date = new DateTime(2017, 02, 16);
var courses = context.Courses
.Where(course => course.StartDate <= date && course.EndDate >= date)
.OrderBy(course => course.Students.Count)
.Select(course => new
{
course.Name,
course.StartDate,
course.EndDate,
Duration = SqlFunctions.DateDiff("day", course.StartDate, course.EndDate),
course.Students
});
foreach (var course in courses.OrderByDescending(course => course.Duration))
{
Console.WriteLine($"Course: {course.Name}");
Console.WriteLine($"Starting on: {course.StartDate.ToShortDateString()}");
Console.WriteLine($"Ending on: {course.EndDate.ToShortDateString()}");
Console.WriteLine($"Duration: {course.Duration} days");
Console.WriteLine($"Students in Course: {course.Students.Count}");
Console.WriteLine();
}
}
static void Main(string[] args)
{
var context = new StudentsContext();
// /*01*/ ListAllStudentsAndTheirHomeworks(context);
// /*02*/ ListAllCoursesWithResources(context);
// /*03*/ ListAllCoursesWithMoreThan5Resources(context);
// /*04*/ ListAllCoursesWhichWereActiveOnGivenDate(context, new DateTime(2017, 4, 20));
// /*05*/ CalculateTheNumberOfCoursesForEachStudent(context);
}
private static void ListAllStudentsAndHomeworkSubmission(StudentsContext context)
{
var students = context.Students.Select(student => new { student.Name, student.Homeworks });
foreach (var student in students)
{
Console.WriteLine($"Student: {student.Name}");
Console.WriteLine("Student homeworks: ");
foreach (var homework in student.Homeworks)
{
Console.WriteLine($"--{homework.Content} of Type: {homework.ContentType}");
}
Console.WriteLine();
}
}
private static void AllCoursesOfAllStudent(StudentsContext context)
{
var students = context.Students
.OrderByDescending(student => student.Courses.Sum(c => c.Price))
.ThenByDescending(student => student.Courses.Count)
.ThenBy(student => student.Name)
.Select(student => new { student.Name, student.Courses });
foreach (var student in students)
{
Console.WriteLine($"Student: {student.Name}");
Console.WriteLine($"Number of Courses: {student.Courses.Count}");
Console.WriteLine($"Total price of Courses: {student.Courses.Sum(course => course.Price)}");
Console.WriteLine($"Average price of Courses: {student.Courses.Average(course => course.Price)}");
Console.WriteLine();
}
}
private static void AllCoursesWithMoreThanFiveResources(StudentsContext context)
{
var courses = context.Courses
.Where(course => course.Resources.Count > 5)
.OrderByDescending(course => course.Resources.Count)
.ThenByDescending(course => course.StartDate);
foreach (var course in courses)
{
Console.WriteLine($"Course: {course.Name}");
Console.WriteLine($"Number of Resources: {course.Resources.Count}");
Console.WriteLine();
}
if (!courses.Any())
{
Console.WriteLine("There is no course with more than five resources!");
}
}
private static void ListAllCoursesWithMoreThan5Resources(StudentsContext context)
{
var courses = context.Courses
.Where(c => c.Resources.Count > 5)
.OrderByDescending(c => c.Resources.Count)
.ThenByDescending(c => c.StartDate)
.Select(c => new
{
Name = c.Name,
ResourcesCount = c.Resources.Count
});
StringBuilder content = new StringBuilder();
foreach (var course in courses)
{
content.AppendLine($"{course.Name} - {course.ResourcesCount}");
}
Console.Write(content);
}
static void Main(string[] args)
{
StudentsContext ctx = new StudentsContext();
Student pesho = new Student()
{
Name = "Pesho",
RegisteredOn = new DateTime(2016, 06, 02)
};
Student tosho = new Student()
{
Name = "Todor",
PhoneNumber = "+359899123932",
BirthDate = new DateTime(1987, 01, 23),
RegisteredOn = new DateTime(2016, 05, 15)
};
Student stami = new Student()
{
Name = "Stamat",
PhoneNumber = "+35985522341",
RegisteredOn = new DateTime(2016, 05, 31)
};
Course programingBasics = new Course()
{
Name = "Programing Basics June-August 2016",
Description = "Entry module with one course",
StartDate = new DateTime(2016, 06, 18),
EndDate = new DateTime(2016, 08, 28)
};
Resource videoLessonOne = new Resource("video")
{
Name = "Simple calculation.",
Url = "https://softuni.bg/trainings/resources/video/9174/video-screen-18-06-2016-georgi-inkov-programming-basics-june-2016"
};
pesho.Courses.Add(programingBasics);
tosho.Courses.Add(programingBasics);
stami.Courses.Add(programingBasics);
programingBasics.Resourses.Add(videoLessonOne);
ctx.SaveChanges();
}
private static void ListAllCoursesWithTheirResources(StudentsContext context)
{
var courses = context.Courses
.OrderBy(course => course.StartDate)
.ThenByDescending(course => course.EndDate)
.Select(course => new { course.Name, course.Description, course.Resources });
foreach (var course in courses)
{
Console.WriteLine($"Course: {course.Name}");
Console.WriteLine($"Description: {course.Description}");
foreach (var resource in course.Resources)
{
Console.WriteLine($"--Resource Name: {resource.Name}");
Console.WriteLine($"--Resource Type: {resource.Type}");
Console.WriteLine($"--Resource URL: {resource.URL}");
}
Console.WriteLine();
}
}
private static void CalculateTheNumberOfCoursesForEachStudent(StudentsContext context)
{
var students = context.Students
.Select(s => new
{
Name = s.Name,
NumberOfCourses = s.Courses.Count,
TotalPrice = s.Courses.Sum(c => c.Price),
AveragePrice = s.Courses.Average(c => c.Price)
})
.OrderByDescending(s => s.TotalPrice)
.ThenByDescending(s => s.NumberOfCourses)
.ThenBy(s => s.Name);
StringBuilder content = new StringBuilder();
foreach (var s in students)
{
content.AppendLine($"{s.Name} {s.NumberOfCourses} {s.TotalPrice} {s.AveragePrice}");
}
Console.Write(content);
}
private static void Main(string[] args)
{
// Task 1 - The database and the models are created;
// Task 2 - The inserted sample data is in the Seed method in Migrations.Configuration;
// Task 4 - Added migration 'AddedLicenseModel' for the creation of the License model and foreign key with the Resource model;
StudentsContext context = new StudentsContext();
//Task 3.1:
//ListAllStudentsAndHomeworkSubmission(context);
//Task 3.2:
//ListAllCoursesWithTheirResources(context);
//Task 3.3:
//AllCoursesWithMoreThanFiveResources(context);
//Task 3.4:
//AllCoursesActiveOnGivenDate(context);
//Task 3.5:
//AllCoursesOfAllStudent(context);
}
private static void ListAllCoursesWithResources(StudentsContext context)
{
var courses = context.Courses
.OrderBy(c => c.StartDate)
.ThenByDescending(c => c.EndDate)
.Select(c => new
{
Name = c.Name,
Description = c.Description,
Resources = c.Resources
});
StringBuilder content = new StringBuilder();
foreach (var course in courses)
{
content.AppendLine($"{course.Name} {course.Description}");
foreach (var resource in course.Resources)
{
content.AppendLine($"--- {resource.Name} {resource.ResourceType} {resource.Url}");
}
}
Console.Write(content);
}
private static void ListAllStudentsAndTheirHomeworks(StudentsContext context)
{
var students = context.Students
.Select(s => new
{
Name = s.Name,
Homeworks = s.Homeworks.Select(h => new
{
Content = h.Content,
Type = h.ContentType
})
});
StringBuilder content = new StringBuilder();
foreach (var student in students)
{
content.Append(student.Name);
foreach (var homework in student.Homeworks)
{
content.Append($" - {homework.Content} - {homework.Type}");
}
content.AppendLine();
}
Console.WriteLine(content);
}
