C# ASP.NET MVC 5路由可选参数

我的ApicController中有一个操作，我想从特定链接调用它，所以我创建了这个简单的路由

[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，但我想使参数成为可选的。据介绍，在路由中的参数名称末尾添加一个问题点就足够了

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

这样，如果我没有提供可选参数，我会得到一个错误，所以

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

{“Message”：“未找到与请求URI“”匹配的HTTP资源。”，“MessageDetail”：“在与请求匹配的控制器“Rest”上未找到任何操作。”}

---

Web API要求显式设置可选值，即使对于可为空的类型和类也是如此

将默认值用于可选参数：

不要忘记路由注册：

---

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前缀

    [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.在路由中的操作名称前写入参数

   [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);
         }
     }

希望这将帮助您解决您的问题。谢谢

    [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);
         }
     }

   [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);
         }
     }