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**1. UserController.cs (Backend):**
```csharp
using Microsoft.AspNetCore.Mvc;
using System;
using System.Collections.Generic;
[Route("api/users")]
[ApiController]
public class UserController : ControllerBase
{
private static List<User> users = new List<User>();
[HttpPost("register")]
public ActionResult<User> RegisterUser([FromBody] User newUser)
{
if (users.Any(u => u.Username == newUser.Username))
{
return Conflict("Username already exists");
}
newUser.Id = Guid.NewGuid();
users.Add(newUser);
return CreatedAtAction(nameof(GetUser), new { id = newUser.Id }, newUser);
}
[HttpPost("login")]
public ActionResult<User> LoginUser([FromBody] UserLogin userLogin)
{
var user = users.FirstOrDefault(u => u.Username == userLogin.Username && u.Password == userLogin.Password);
if (user == null)
{
return NotFound("Invalid username or password");
}
return Ok(user);
}
[HttpGet("{id}")]
public ActionResult<User> GetUser(Guid id)
{
var user = users.FirstOrDefault(u => u.Id == id);
if (user == null)
{
return NotFound();
}
return Ok(user);
}
}
public class User
{
public Guid Id { get; set; }
public string Username { get; set; }
public string Password { get; set; }
}
public class UserLogin
{
public string Username { get; set; }
public string Password { get; set; }
}
```
**2. Index.html (Frontend):**
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>User Login and Registration</title>
<style>
body {
font-family: Arial, sans-serif;
margin: 0;
padding: 0;
display: flex;
align-items: center;
justify-content: center;
height: 100vh;
}
form {
text-align: center;
max-width: 300px;
margin: auto;
}
label {
display: block;
margin-bottom: 5px;
}
input {
width: 100%;
padding: 8px;
margin-bottom: 10px;
box-sizing: border-box;
}
button {
width: 100%;
padding: 10px;
background-color: #4CAF50;
color: white;
border: none;
border-radius: 4px;
cursor: pointer;
}
button:hover {
background-color: #45a049;
}
</style>
</head>
<body>
<div id="loginSection">
<h2>User Login</h2>
<form id="loginForm">
<label for="loginUsername">Username:</label>
<input type="text" id="loginUsername" name="loginUsername" required>
<label for="loginPassword">Password:</label>
<input type="password" id="loginPassword" name="loginPassword" required>
<button type="button" onclick="loginUser()">Login</button>
</form>
<p>Don't have an account? <a href="#" onclick="toggleSections('registrationSection')">Register</a></p>
</div>
<div id="registrationSection" style="display: none;">
<h2>User Registration</h2>
<form id="registrationForm">
<label for="regUsername">Username:</label>
<input type="text" id="regUsername" name="regUsername" required>
<label for="regPassword">Password:</label>
<input type="password" id="regPassword" name="regPassword" required>
<button type="button" onclick="registerUser()">Register</button>
</form>
<p>Already have an account? <a href="#" onclick="toggleSections('loginSection')">Login</a></p>
</div>
<script src="userAuth.js"></script>
</body>
</html>
```
**3. userAuth.js (Frontend):**
```javascript
function toggleSections(sectionToShow) {
const loginSection = document.getElementById("loginSection");
const registrationSection = document.getElementById("registrationSection");
if (sectionToShow === "registrationSection") {
loginSection.style.display = "none";
registrationSection.style.display = "block";
} else {
loginSection.style.display = "block";
registrationSection.style.display = "none";
}
}
function loginUser() {
const loginUsername = document.getElementById("loginUsername").value;
const loginPassword = document.getElementById("loginPassword").value;
fetch('api/users/login', {
method: 'POST',
headers: {
'Content-Type': 'application/json',
},
body: JSON.stringify({ username: loginUsername, password: loginPassword }),
})
.then(response => response.json())
.then(data => {
console.log('Login successful:', data);
// Handle successful login (e.g., redirect to main application).
})
.catch(error => {
console.error('Error during login:', error);
// Handle login error.
});
}
function registerUser() {
const regUsername = document.getElementById("regUsername").value;
const regPassword = document.getElementById("regPassword").value;
fetch('api/users/register', {
method: 'POST',
headers: {
'Content-Type': 'application/json',
},
body: JSON.stringify({ username: regUsername, password: regPassword }),
})
.then(response => response.json())
.then(data => {
console.log('Registration successful:', data);
// Optionally, redirect to login section after successful registration.
toggleSections('loginSection');
})
.catch(error => {
console.error('Error during registration:', error);
// Handle registration error.
});
}
```
This example provides a simple user login and registration experience with ASP.NET Core Web API for the backend and HTML/JavaScript for the frontend. Make sure to adjust it based on your specific requirements and consider adding security measures for a production environment.
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