[英]ASP.NET MVC 5 routing optional parameters
我在ApiController中有一个Action,我想从一个特定的链接调用,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,但我想使参数可选。 根据文档在路径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,如果我不提供可选参数,我会收到错误,所以
.../Rest/GetName/AnyName --> ok
.../Rest/GetName/ --> error (see below)
{“Message”:“找不到与请求URI匹配的HTTP资源' https:// localhost / miApp / Rest / GetName '。”,“MessageDetail”:“在控制器'Rest'上找不到与之匹配的操作请求。”}
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。
使用默认值为可选参数:
[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()
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. 在路径中的动作名称之前写入参数
[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);
}
}
希望这可以帮助您解决问题。谢谢
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