在ASP.NET Core Web API中，身份验证令牌可以用来保护API免受未经授权的访问。默认情况下，ASP.NET Core Web API会在每个请求中验证身份令牌，以确保访问者有权访问API资源。

以下是一个示例，展示了如何在ASP.NET Core Web API中进行身份验证令牌的验证：

[Authorize] [ApiController] [Route("api/[controller]")] public class TodoController : ControllerBase { private readonly TodoContext _context;

public TodoController(TodoContext context)
{
    _context = context;
}

// GET: api/Todo
[HttpGet]
public async Task>> GetTodoItems()
{
    return await _context.TodoItems.ToListAsync();
}

// GET: api/Todo/5
[HttpGet("{id}")]
public async Task> GetTodoItem(long id)
{
    var todoItem = await _context.TodoItems.FindAsync(id);

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

    return todoItem;
}

// POST: api/Todo
[HttpPost]
public async Task> PostTodoItem(TodoItem item)
{
    _context.TodoItems.Add(item);
    await _context.SaveChangesAsync();

    return CreatedAtAction(nameof(GetTodoItem), new { id = item.Id }, item);
}

// PUT: api/Todo/5
[HttpPut("{id}")]
public async Task PutTodoItem(long id, TodoItem item)
{
    if (id != item.Id)
    {
        return BadRequest();
    }

    _context.Entry(item).State = EntityState.Modified;
    await _context.SaveChangesAsync();

    return NoContent();
}

// DELETE: api/Todo/5
[HttpDelete("{id}")]
public async Task DeleteTodoItem(long id)
{
    var todoItem = await _context.TodoItems.FindAsync(id);

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

    _context.T