Rumah > Artikel > pembangunan bahagian belakang > Bagaimana untuk menggunakan pengindeks dalam C# 8.0?
^ pengendali − Ia dikenali sebagai pengendali pengindeksan dari akhir.
Ia mengembalikan indeks relatif kepada penghujung jujukan atau set.
Berbanding kaedah sebelumnya, ia adalah cara yang paling ringkas dan mudah untuk mencari elemen terakhir.
kaedah.company.listEmployees[^2].Name = "Pekerja 2 nama ditukar menggunakan sintaks baharu";
company.listEmployees[^5].Name = "Pekerja 5 nama ditukar menggunakan sintaks baharu";
syarikat. listEmployees[^8].Name = "Pekerja 8 nama ditukar menggunakan sintaks baharu";
public class Employee{ public int EmployeeId { get; set; } public string Name { get; set; } public string Gender { get; set; } } public class Company{ public List<Employee> listEmployees; public Company(){ listEmployees = new List<Employee>(); listEmployees.Add(new Employee { EmployeeId = 1, Name = "SS", Gender = "Male" }); listEmployees.Add(new Employee { EmployeeId = 2, Name = "SSS", Gender = "Female" }); listEmployees.Add(new Employee { EmployeeId = 3, Name = "SSSS", Gender = "Male" }); listEmployees.Add(new Employee { EmployeeId = 4, Name = "EE", Gender = "Female" }); listEmployees.Add(new Employee { EmployeeId = 5, Name = "EEEE", Gender = "Female" }); listEmployees.Add(new Employee { EmployeeId = 6, Name = "TTT", Gender = "Male" }); listEmployees.Add(new Employee { EmployeeId = 7, Name = "FFF", Gender = "Male" }); listEmployees.Add(new Employee { EmployeeId = 8, Name = "GGG", Gender = "Male" }); } public string this[int employeeId]{ get{ return listEmployees. FirstOrDefault(x => x.EmployeeId == employeeId).Name; } set{ listEmployees. FirstOrDefault(x => x.EmployeeId == employeeId).Name = value; } } } class Program{ public static void Main(){ Company company = new Company(); Console.WriteLine("Name of Employee with Id = 2: " + company[2]); Console.WriteLine("Name of Employee with Id = 5: " + company[5]); Console.WriteLine("Name of Employee with Id = 8: " + company[8]); System.Console.WriteLine(); Console.WriteLine("Changing names of employees with Id = 2,5,8"); company[2] = "Employee 2 Name Changed"; company[5] = "Employee 5 Name Changed"; company[8] = "Employee 8 Name Changed"; System.Console.WriteLine(); Console.WriteLine("Name of Employee with Id = 2: " + company[2]); Console.WriteLine("Name of Employee with Id = 5: " + company[5]); Console.WriteLine("Name of Employee with Id = 8: " + company[8]); company.listEmployees[^2].Name = "Employee 2 Name Changed using new Syntax"; company.listEmployees[^5].Name = "Employee 5 Name Changed using new Syntax"; company.listEmployees[^8].Name = "Employee 8 Name Changed using new Syntax"; System.Console.WriteLine(); Console.WriteLine("Name of Employee with Id = 2: " + company.listEmployees[^2].Name); Console.WriteLine("Name of Employee with Id = 5: " + company.listEmployees[^5].Name); Console.WriteLine("Name of Employee with Id = 8: " + company.listEmployees[^8].Name); Console.ReadLine(); } }
Name of Employee with Id = 2: SSS Name of Employee with Id = 5: EEEE Name of Employee with Id = 8: GGG Changing names of employees with Id = 2,5,8 Name of Employee with Id = 2: Employee 2 Name Changed Name of Employee with Id = 5: Employee 5 Name Changed Name of Employee with Id = 8: Employee 8 Name Changed Name of Employee with Id = 2: Employee 2 Name Changed using new Syntax Name of Employee with Id = 5: Employee 5 Name Changed using new Syntax Name of Employee with Id = 8: Employee 8 Name Changed using new Syntax
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