带有路由属性的Web API版本控制时如何获取控制器名称 [英] How to get controller name when Web API versioning with routing attributes

问题描述

我需要从路由中获取控制器名称，如果在WebApiConfig中使用标准路由代码，我可以做到这一点.

I need to get the controller name from my route and this I can do if using standard routing code in WebApiConfig.

但是，如果我使用的是路由属性，它将开始变得有些困难，尤其是在尝试版本控制时.

However, if I am using routing attributes it starts to get a little difficult, especially when trying to version.

示例:如果我调用一个api/terms/bonuses，并且有一个BonusController和BonusV2Controller以及一个BonusV3Controller，那么这段代码将返回最新的控制器版本3.好的，我可以接受它返回的最新最大版本.默认.

Example: If I call an api/terms/bonuses and I have a BonusController and BonusV2Controller and a BonusV3Controller, this code returns the latest controller version 3. That's ok, I can live with that returning the latest and greatest version as a default.

var attributedRoutesData = request.GetRouteData().GetSubRoutes();
var subRouteData = attributedRoutesData.FirstOrDefault();

var actions = (ReflectedHttpActionDescriptor[])subRouteData.Route.DataTokens["actions"];
//This seems to get latest controller name. ie. V2
controllerName = actions[0].ControllerDescriptor.ControllerName;

现在，如果我请求版本1，为简单起见，我将使用查询字符串并调用api/terms/bonuses?v = 2

Now if I request a version 1, for simplicity I'll use a querystring and call api/terms/bonuses?v=2

因此，此代码不再有效(显然).

So this code no longer works (obviously).

如何获取V2控制器名称?

How do I get the V2 controller name?

如果我放弃路由属性，而只使用WebApiConfig路由，则此代码会很愉快.

If I abandon routing attributes and just use WebApiConfig routing, this code works happily.

HttpControllerDescriptor controllerDescriptor = null; 
var controllers = GetControllerMapping();
var routeData = request.GetRouteData();
var controllerName = (string)routeData.Values["controller"];

更新:

这是我的完整选择器代码.

Here is my full selector code.

IDictionary<string, HttpControllerDescriptor> controllers = GetControllerMapping();                                             

var attributedRoutesData = request.GetRouteData().GetSubRoutes();
var subRouteData = attributedRoutesData.LastOrDefault(); //LastOrDefault() will get PeopleController, FirstOrDefault will get People{version}Controller which we don't want

var actions = (ReflectedHttpActionDescriptor[])subRouteData.Route.DataTokens["actions"];
var controllerName = actions[0].ControllerDescriptor.ControllerName;


//For controller name without attribute routing
//var controllerName = (string)routeData.Values["controller"];

HttpControllerDescriptor oldControllerDescriptor;
if (controllers.TryGetValue(controllerName, out oldControllerDescriptor))
{
    //TODO: Different techniques for handling version api requests.
    var apiVersion = GetVersionFromQueryString(request);
    //var version = GetVersionFromHeader(request);
    //var version = GetVersionFromAcceptHeaderVersion(request);
    //var version = GetVersionFromMediaType(request);

    if (!String.IsNullOrEmpty(apiVersion))
    {
        var newControllerName = String.Concat(controllerName, "V", apiVersion);

        HttpControllerDescriptor newControllerDescriptor;
        if (controllers.TryGetValue(newControllerName, out newControllerDescriptor))
        {
            return newControllerDescriptor;
            }
        }
        return oldControllerDescriptor;
    }
    return null;

推荐答案

 var subRouteData = request.GetRouteData().GetSubRoutes().LastOrDefault();

 if (subRouteData != null && subRouteData.Route != null)
 {
  var actions = subRouteData.Route.DataTokens["actions"] as HttpActionDescriptor[];

  if (actions != null && actions.Length > 0)
  {
     controllerName = actions[0].ControllerDescriptor.ControllerName;
  }
}

这篇关于带有路由属性的Web API版本控制时如何获取控制器名称的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！