Question

我想在ApiController中调用一个我想从特定链接调用的Action，所以我创建了这个简单的路径

[Route("Rest/GetName/{name}")]
public IHttpActionResult GetName(string name) {
    // cut - code here is trivial but long, I just fill in an object to return as Json code
    return Json(myObject);
}

它工作正常，但我想让参数可选。根据{{3}}在路径中的参数名称末尾添加一个问题点应该足够了

[Route("Rest/GetName/{name?}")]

这样一来，如果我没有提供可选参数，我会收到错误，所以

.../Rest/GetName/AnyName --> ok
.../Rest/GetName/ --> error (see below)

{＆＃34;消息＆＃34;：＆＃34;未找到与请求URI匹配的HTTP资源＆＃39; documentation＆＃39;。＆＃34;，＆＃34; MessageDetail＆＃34;：＆＃34;控制器上没有找到任何操作＆＃39;休息＆＃39;与请求匹配。＆＃34;}

Answer 1

Web API需要显式设置可选值，即使对于可空类型和类也是如此。

将默认值用于可选参数：

[Route("Rest/GetName/{name?}")]
public IHttpActionResult GetName(string name = null) {
    // cut - code here is trivial but long, I just fill in an object to return as Json code
    return Json(myObject);
}

不要忘记路由注册：

httpConfig.MapHttpAttributeRoutes()

Answer 2

有许多可能的解决方案：

尝试可选参数

   [Route("Rest/GetName/{name?}")]
   public IHttpActionResult GetName(string name = null) {
       // cut - code here        is trivial but long, I just fill in an               
       obj ect to return as 
       `enter code here`Json code
       return Json(myObject);
         }

2. 首先在控制器上设置PreFix

    [RoutePrefix("api/Rest")]
    [Authorize]
    public class RestController : ApiController
    {
         [Route("/GetName/{name}")]
         public IHttpActionResult GetName(string name = null) 
         {
         // cut - code here is trivial but long, I just fill in an object
         to  return as Json code
         return Json(myObject);
         }
     }

3. 在路线中的行动名称之前写入参数

   [RoutePrefix("api/Rest")]
    [Authorize]
    public class RestController : ApiController
    {
         [Route("{name}/GetName")]
         public IHttpActionResult GetName(string name = null) 
         {
         // cut - code here is trivial but long, I just fill in an object
         to  return as Json code
         return Json(myObject);
         }
     }

希望这有助于您解决问题。谢谢

ASP.NET MVC 5路由可选参数

2 个答案: