Azure 自定义控制器API .Net 后端

csharp
using System.Collections.Generic;
using Microsoft.AspNetCore.Mvc;
namespace TodoApi.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    public class TodoController : ControllerBase
    {
        private List todos = new List();
        [HttpGet]
        public ActionResult> GetTodos()
        {
            return todos;
        }
        [HttpPost]
        public ActionResult AddTodo([FromBody] string todo)
        {
            todos.Add(todo);
            return todo;
        }
        [HttpDelete("{index}")]
        public ActionResult DeleteTodo(int index)
        {
            if (index >= 0 && index < todos.Count)
            {
                string deletedTodo = todos[index];
                todos.RemoveAt(index);
                return deletedTodo;
            }
            else
            {
                return NotFound();
            }
        }
    }
}