中间带有属性路由的 Web Api 可选参数

Question

所以我正在用Postman测试我的一些路由，但我似乎无法通过这个电话：

接口函数

[RoutePrefix("api/Employees")]
public class CallsController : ApiController
{
    [HttpGet]
    [Route("{id:int?}/Calls/{callId:int?}")]
    public async Task<ApiResponse<object>> GetCall(int? id = null, int? callId = null)
    {
        var testRetrieve = id;
        var testRetrieve2 = callId;

        throw new NotImplementedException();
    }
}

邮递员请求

http://localhost:61941/api/Employees/Calls 不起作用

错误：

{
  "Message": "No HTTP resource was found that matches the request URI 'http://localhost:61941/api/Employees/Calls'.",
  "MessageDetail": "No action was found on the controller 'Employees' that matches the request."
}

http://localhost:61941/api/Employees/1/Calls WORKS

http://localhost:61941/api/Employees/1/Calls/1 WORKS

知道为什么我不能在前缀和自定义路由之间使用可选项吗？ 我试过将它们组合成一个自定义路由，这不会改变任何东西，任何时候我试图删除它都会导致问题的 id。

Answer 1

可选参数必须在路由模板的末尾。 所以你试图做的事情是不可能的。

属性路由：可选的 URI 参数和默认值

你要么改变你的路线模板

[Route("Calls/{id:int?}/{callId:int?}")]

或创建一个新动作

[RoutePrefix("api/Employees")]
public class CallsController : ApiController {

    //GET api/Employees/1/Calls
    //GET api/Employees/1/Calls/1
    [HttpGet]
    [Route("{id:int}/Calls/{callId:int?}")]
    public async Task<ApiResponse<object>> GetCall(int id, int? callId = null) {
        var testRetrieve = id;
        var testRetrieve2 = callId;

        throw new NotImplementedException();
    }

    //GET api/Employees/Calls
    [HttpGet]
    [Route("Calls")]
    public async Task<ApiResponse<object>> GetAllCalls() {
        throw new NotImplementedException();
    }
}

Answer 2

我会将路线更改为：

[Route("Calls/{id:int?}/{callId:int?}")]

并将[FromUri]属性添加到您的参数中：

([FromUri]int? id = null, [FromUri]int? callId = null)

我的测试函数如下所示：

[HttpGet]
[Route("Calls/{id:int?}/{callId:int?}")]
public async Task<IHttpActionResult> GetCall([FromUri]int? id = null, [FromUri]int? callId = null)
{
    var test = string.Format("id: {0} callid: {1}", id, callId);

    return Ok(test);
}

我可以使用以下方法调用它：

https://localhost/WebApplication1/api/Employees/Calls
https://localhost/WebApplication1/api/Employees/Calls?id=3
https://localhost/WebApplication1/api/Employees/Calls?callid=2
https://localhost/WebApplication1/api/Employees/Calls?id=3&callid=2

Answer 3

实际上你不需要在路由中指定可选参数

[Route("Calls")]

或者你需要改变路线

 [Route("Calls/{id:int?}/{callId:int?}")]
 public async Task<ApiResponse<object>> GetCall(int? id = null, int? callId = null)