ApiController 获取 id 不起作用

Question

我刚开始使用ApiController。我正在尝试发送一个 ID 的 HTTP GET，但它不起作用。

我的 ApiController：

[Route("api/Test")]
public class TestController : ApiController
{
    private myEntity db = new myEntity();

    [HttpGet]
    public HttpResponseMessage GetAll()
    {
        // Get a list of customers
        IEnumerable<Customer> customers = db.Customers.ToList();

        // Write the list of customers to the response body
        HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.OK, customers);

        return response;
    }

    [HttpGet]
    public HttpResponseMessage GetById(int id)
    {
        // Get Customer by id
        Customer customer = db.Customers.Where(x => x.Id == id).FirstOrDefault();

        HttpResponseMessage response;

        if (customer == null)
        {
            response = Request.CreateResponse(HttpStatusCode.NotFound);
            return response;
        } else
        {
            response = Request.CreateResponse(HttpStatusCode.OK, customer);
        }

        return response;
    }

当我在浏览器中运行它时，GetAll 方法可以完美运行。然而，当我尝试GetById:

http://localhost:53198/api/Test/1

返回：

未找到与请求 URI http://localhost:53198/api/Test/1 匹配的 HTTP 资源

有谁知道我做错了什么？

Answer 1

如果使用属性路由，您需要进行一些更改以确保操作路由是不同的，以避免任何路由冲突。

[RoutePrefix("api/Test")]
public class TestController : ApiController {
    private myEntity db = new myEntity();

    //GET api/Test
    [HttpGet]
    [Route("")]
    public IHttpActionResult GetAll() {
        // Get a list of customers
        var customers = db.Customers.ToList();    
        // Write the list of customers to the response body
        return OK(customers);
    }

    //GET api/Test/1
    [HttpGet]
    [Route("{id:int}")]
    public IHttpActionResult GetById(int id) {
        // Get Customer by id
        Customer customer = db.Customers.Where(x => x.Id == id).FirstOrDefault();
        if (customer == null) {
            return NotFound();
        }
        return Ok(customer);
    }
}

这假定属性路由已启用

public static class WebApiConfig {
    public static void Register(HttpConfiguration config) {
        // Attribute routing.
        config.MapHttpAttributeRoutes();

        // Convention-based routing.
        config.Routes.MapHttpRoute(
            name: "DefaultApi",
            routeTemplate: "api/{controller}/{id}",
            defaults: new { id = RouteParameter.Optional }
        );
    }
}

参考Attribute Routing in ASP.NET Web API 2

Answer 2

你可以做任何一个

• http://localhost:53198/api/Test/GetById/1（正如 DavidG 所说）

或

• http://localhost:53198/api/Test/1 并将您的代码更改为

  [HttpGet]
  [Route("{id:int}")]
  public HttpResponseMessage GetById(int id)