Notes

Certainly! Here's a simple example of a `Controller` class in ASP.NET Core to expose RESTful endpoints for employee-related activities:

```csharp
using Microsoft.AspNetCore.Mvc;
using EmployeeManagement.BusinessLayer.Interfaces;
using EmployeeManagement.Entities;
using System;

namespace EmployeeManagement.Controllers
{
[ApiController]
[Route("api/employees")] // Define a base route for all employee-related endpoints
public class EmployeeController : ControllerBase
{
private readonly IEmployeeService _employeeService;

public EmployeeController(IEmployeeService employeeService)
{
_employeeService = employeeService;
}

[HttpGet]
public ActionResult GetEmployees()
{
try
{
var employees = _employeeService.GetEmployees();
return Ok(employees);
}
catch (Exception ex)
{
return StatusCode(500, $"Internal server error: {ex.Message}");
}
}

[HttpGet("{id}")]
public ActionResult GetEmployeeById(int id)
{
try
{
var employee = _employeeService.GetEmployeeById(id);

if (employee == null)
return NotFound(); // 404 Not Found

return Ok(employee);
}
catch (Exception ex)
{
return StatusCode(500, $"Internal server error: {ex.Message}");
}
}

[HttpPost]
public ActionResult AddEmployee([FromBody] Employee employee)
{
try
{
_employeeService.AddEmployee(employee);
return CreatedAtAction(nameof(GetEmployeeById), new { id = employee.EmployeeID }, employee);
}
catch (Exception ex)
{
return StatusCode(500, $"Internal server error: {ex.Message}");
}
}

[HttpPut("{id}")]
public ActionResult UpdateEmployee(int id, [FromBody] Employee employee)
{
try
{
var existingEmployee = _employeeService.GetEmployeeById(id);

if (existingEmployee == null)
return NotFound(); // 404 Not Found

_employeeService.UpdateEmployee(employee);
return NoContent(); // 204 No Content
}
catch (Exception ex)
{
return StatusCode(500, $"Internal server error: {ex.Message}");
}
}

[HttpDelete("{id}")]
public ActionResult DeleteEmployee(int id)
{
try
{
var existingEmployee = _employeeService.GetEmployeeById(id);

if (existingEmployee == null)
return NotFound(); // 404 Not Found

_employeeService.DeleteEmployee(id);
return NoContent(); // 204 No Content
}
catch (Exception ex)
{
return StatusCode(500, $"Internal server error: {ex.Message}");
}
}
}
}
```

This example includes endpoints for:

- `GET /api/employees` - Get all employees
- `GET /api/employees/{id}` - Get an employee by ID
- `POST /api/employees` - Add a new employee
- `PUT /api/employees/{id}` - Update an existing employee
- `DELETE /api/employees/{id}` - Delete an employee

Adjust the routes and methods according to your specific