Notes

using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using WebApplication1.Models;

namespace WebApplication1.Controllers
{
[Route("api/[controller]")]
[ApiController]
public class ItemController : ControllerBase
{
private static List<Item> items = new List<Item>();
private static int nextId = 1;

[HttpGet]
public IEnumerable<Item> Get()
{
return items;
}
[HttpGet("{id}")]
public ActionResult<Item> Get(int id)
{
var item = items.FirstOrDefault(x => x.Id == id);
if (item == null) return NotFound();
return item;
}
[HttpPost]
public ActionResult<Item> Post(Item item)
{
if (item == null) { return BadRequest(); }

item.Id = nextId++;
items.Add(item);
return CreatedAtAction(nameof(Get), new { id = item.Id }, item);
}
[HttpPut("{id}")]
public ActionResult Put(int id,Item item)
{
var index = items.FindIndex(x => x.Id == id);
if (index < 0 || index == null ) return NotFound();

items[index] = item;
return NoContent();
}

[HttpDelete("{id}")]
public ActionResult Delete(int id)
{
var index = items.FindIndex(x => x.Id == id);
if (index < 0 || index == null) return NotFound();

items.RemoveAt(index);
return NoContent();
}
}
}





using System;
using System.Collections.Generic;
using Microsoft.AspNetCore.Mvc;
using StudentManagementSystem.Models;

namespace StudentManagementSystem.Controllers
{
[Route("api/[controller]")]
[ApiController]
public class StudentController : ControllerBase
{
private static readonly StudentManagementSystem.Models.Class SystemInstance = new StudentManagementSystem.Models.Class();

public int id = 1;
[HttpGet]
public IEnumerable<Student> GetStudents()
{
return SystemInstance.Students;
}

[HttpGet("{id}", Name = "GetStudent")]

public ActionResult<Student> GetStudent(int id)
{
var student = SystemInstance.Students.Find(s => s.StudentId == id);

if (student == null)

{
return NotFound();
}
return student;
}

[HttpPost]

public ActionResult<Student> PostStudent(Student student)
{

student.StudentId = GenerateUniqueId();

SystemInstance.Students.Add(student);

return CreatedAtAction(nameof(GetStudent), new { id = student.StudentId }, student);

}

[HttpPut("{id}")]

public IActionResult PutStudent(int id, Student student)
{
var existingStudent = SystemInstance.Students.Find(s => s.StudentId == id);

if (existingStudent == null)
{
return NotFound();
}

existingStudent.Name = student.Name;

existingStudent.ContactDetails = student.ContactDetails;

existingStudent.ClassAssignment = student.ClassAssignment;

return NoContent();
}

[HttpDelete("{id}")]

public IActionResult DeleteStudent(int id)
{
var student = SystemInstance.Students.Find(s => s.StudentId == id);

if (student == null)
{
return NotFound();
}

SystemInstance.Students.Remove(student);

return NoContent();
}

private int GenerateUniqueId()

{
return id++;
}

}

}