为什么我的属性路由不起作用？

Question

这是我的控制器的外观：

[Route("api/[controller]")]
[Produces("application/json")]
public class ClientsController : Controller
{
    private readonly IDataService _clients;

    public ClientsController(IDataService dataService)
    {
        _clients = dataService;
    }

    [HttpPost]
    public int Post([Bind("GivenName,FamilyName,GenderId,DateOfBirth,Id")] Client model)
    {
        // NB Implement.
        return 0;
    }

    [HttpGet("api/Client/Get")]
    [Produces(typeof(IEnumerable<Client>))]
    public async Task<IActionResult> Get()
    {
        var clients = await _clients.ReadAsync();
        return Ok(clients);
    }

    [HttpGet("api/Client/Get/{id:int}")]
    [Produces(typeof(Client))]
    public async Task<IActionResult> Get(int id)
    {
        var client = await _clients.ReadAsync(id);
        if (client == null)
        {
            return NotFound();
        }

        return Ok(client);
    }

    [HttpGet("api/Client/Put")]
    public void Put(int id, [FromBody]string value)
    {
    }

    [HttpGet("api/Client/Delete/{id:int}")]
    public void Delete(int id)
    {
    }
}

但是当我请求URL时/api/Clients/Get，如下所示：

json = await Client.GetStringAsync("api/Clients/Get");

我得到以下异常：

AmbiguousActionException：多个动作匹配。以下操作与路线数据匹配，并且满足所有约束：

Assessment.Web.Controllers.ClientsController.Index（Assessment.Web）Assessment.Web.Controllers.ClientsController.Details（Assessment.Web）Assessment.Web.Controllers.ClientsController.Create（Assessment.Web）

Client是一个HttpClient。请注意，尽管名称相同，但没有GET操作与路线数据匹配id。

这有什么问题吗？

Answer 1

您使用的属性错误。

您在控制器上有一条路线

[Route("api/[controller]")]

它将映射到api/Clients控制器中的任何动作路由并在其之前加上前缀。

所以这意味着

[HttpGet("api/Client/Get")] // Matches GET api/Clients/api/Client/Get
[Produces(typeof(IEnumerable<Client>))]
public async Task<IActionResult> Get()
{
    var clients = await _clients.ReadAsync();
    return Ok(clients);
}

api/Clients/api/Client/Get由于控制器上的路由前缀而将GET匹配到。

引用路由到控制器操作

您需要相应地更新操作上的属性路由

[Route("api/[controller]")]
[Produces("application/json")]
public class ClientsController : Controller {
    private readonly IDataService _clients;

    public ClientsController(IDataService dataService)
    {
        _clients = dataService;
    }

    [HttpPost] //Matches POST api/Clients
    public int Post([Bind("GivenName,FamilyName,GenderId,DateOfBirth,Id")] Client model) {
        // NB Implement.
        return 0;
    }

    [HttpGet("Get")] //Matches GET api/Clients/Get
    [Produces(typeof(IEnumerable<Client>))]
    public async Task<IActionResult> Get() {
        //...code removed for brevity
    }

    [HttpGet("Get/{id:int}")] //Matches GET api/Clients/Get/5
    [Produces(typeof(Client))]
    public async Task<IActionResult> Get(int id) {
        //...code removed for brevity
    }

    [HttpGet("Put")] //Matches PUT api/Clients/Put
    public void Put(int id, [FromBody]string value) {
        //...code removed for brevity
    }

    [HttpGet("Delete/{id:int}")] //Matches GET api/Clients/Delete/5
    public void Delete(int id) {
    }
}

实际上，delete动作应重构为HTTP DELETE并应返回 IActionResult

[HttpDelete("Delete/{id:int}")] //Matches DELETE api/Clients/Delete/5
public IActionResult Delete(int id) {
    //...code removed for brevity
}

Answer 2

我认为路由中有一个拼写错误，它应该是 Client s末尾带有 (s) 而不是 Client 。

[HttpGet("api/Clients/Get")]

代替

[HttpGet("api/Client/Get")]

或者将对端点的调用更改为：

 json = await Client.GetStringAsync("api/Client/Get");