Sắp xếp list và in ra màn hình trong lập trình C# sort list in C# Theo class chung và class riêng

Sắp xếp list và in ra màn hình trong C# sort list in C#

Sắp xếp list trong C# Bài 1  >> list.sort()

Exam [01] Sort List C# 2016

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Student : IComparable<Student>
    {
        public string Name { set; get; }
        public int Age { set; get; }
        public Student() { }
        public Student(string name, int age)
        {
            Name = name;
            Age = age;
        }
        public int CompareTo(Student other)
        {
            if (this.Name.CompareTo(other.Name) == 0)
            {
                if (Age > other.Age)
                    return 1; //Age lớn hơn 
                if(Age < other.Age)
                    return -1;  //Age nhỏ hơn
                if(Age == other.Age)
                    return 0; //Hai đối tượng coi như bằng nhau
            }
            return this.Name.CompareTo(other.Name);
        }

    }

    class Program
    {
        static void Main(string[] args)
        {
            List<Student> list = new List<Student>()
            {
                new Student("Nong Long",12),
                new Student("Nong Long",22),
                new Student("Nong Long",62),
                new Student("Nong Long",11)

            };
            Console.WriteLine("Truoc khi sap xep");
            foreach (Student std in list)
            {
                Console.WriteLine(std.Name+";"+std.Age);
            }
            list.Sort();
            Console.WriteLine("Sau khi sap xep");
            foreach(Student std in list){
                Console.WriteLine(std.Name+"; "+std.Age);
            }
            int st = list.BinarySearch(new Student("duyet", 30));
            Console.WriteLine();
            Console.ReadLine();

        }
    }
}

Sắp xếp list trong C# Bài 2 >> list.Sort(new CompareStudent());

Exam [02] Sort List C# 2016

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication2
{
    class Student : IComparable<Student>
    {
        public string firstname { get; set; }
        public string lastname { get; set; }
        public string email { get; set; }
        public string clas { get; set; }
        public Student(string _firstname, string _lastname, string _email, string _clas)
        {
            firstname = _firstname;
            lastname = _lastname;
            email = _email;
            clas = _clas;
        }

        int IComparable<Student>.CompareTo(Student other)
        {

            throw new NotImplementedException();
        }
    }
    class CompareStudent : IComparer<Student>
    {
        int IComparer<Student>.Compare(Student x, Student y)
        {
            if (x == null || x.firstname == null)
            {
                return -1; //Nếu x null coi như y lớn hơn
            }
            if (y == null || y.firstname == null)
            {
                return 1; //Nếu y null thì coi như x lớn hơn
            }
            if (x.firstname == y.firstname)
            {
                if (x == null || x.lastname == null)
                {
                    return -1; //Tương tự
                }
                if (y == null || y.lastname == null)
                {
                    return 1; //Tương tự
                }
                return x.lastname.CompareTo(y.lastname);
            }
            return x.firstname.CompareTo(y.firstname);
            throw new NotImplementedException();
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            List<Student> list = new List<Student>();
            list.Add(new Student("Xuan", "Nguyen", "abc@123", "FPT-Aptech"));
            list.Add(new Student("Duyen", "Do", "abc@123", "FPT-Aptech"));
            list.Add(new Student("Linh", "Pham", "abc@123", "FPT-Aptech"));
            list.Add(new Student("Binh", "Bui", "abc@123", "FPT-Aptech"));
            list.Add(new Student("Anh", "Nam", "abc@123", "FPT-Aptech"));
            list.Sort(new CompareStudent());
            foreach (Student stu in list)
            {
                Console.WriteLine(stu.firstname + " " + stu.lastname + " " + stu.email + " " + stu.clas);

            }
            Console.ReadLine();

        }
    }
}

list.Sort();

Exam [03] Sort List C# 2016

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Employee : IComparable<Employee>
    {
        public int Salary { get; set; }
        public string Name { get; set; }

        public int CompareTo(Employee other)
        {
            // Alphabetic sort if salary is equal. [A to Z]
            if (this.Salary == other.Salary)
            {
                return this.Name.CompareTo(other.Name);
            }
            // Default to salary sort. [High to low]
            return other.Salary.CompareTo(this.Salary);
        }

        public override string ToString()
        {
            // String representation.
            return this.Salary.ToString() + "," + this.Name;
        }
    }

    class Program
    {
        static void Main()
        {
            List<Employee> list = new List<Employee>();
            list.Add(new Employee() { Name = "Steve", Salary = 10000 });
            list.Add(new Employee() { Name = "Janet", Salary = 10000 });
            list.Add(new Employee() { Name = "Andrew", Salary = 10000 });
            list.Add(new Employee() { Name = "Bill", Salary = 500000 });
            list.Add(new Employee() { Name = "Lucy", Salary = 8000 });

            // Uses IComparable.CompareTo()
            list.Sort();

            // Uses Employee.ToString
            foreach (var element in list)
            {
                Console.WriteLine(element);
            }
            Console.ReadLine();
        }

    }
}