从Mvc Action中获取WebApi UrlHelper的实例

Question

我在同一个项目中运行WebApi和Mvc(所以它们在进程中).Mvc主要用于服务资产(页面和生成的下载)以及用于ajax数据请求的web api.

为了成为RESTish,大多数WebApi请求都包含一组由以下类生成的链接:

public class ApiLinkMaker
{
    public ApiLinkMaker(UrlHelper url, string authority) {
        this.url = url;
        this.authority = authority;
    }
    public ApiLinkMaker(ApiController controller)
        : this(controller.Url, controller.Request.RequestUri.Authority) { }

    public string MakeLink(string controller, string id) {
        return "//" + authority + url.Route("DefaultApi", new { controller = controller, id = id });
    }
}

那里有一些其他的方法,但这确实是事情的核心,它运作良好.

现在我想优化特定页面.以前我有两个请求

1. 下载html
2. 执行Ajax查询以获取一些数据(以及一些链接)

现在我意识到,出于优化目的,在这种情况下最好只做一个.

1. 下载嵌入了JSON数据的html.

问题是,由于html是由Mvc生成的,我无法创建似乎有用的Api UrlHelper.

我试过了

var url = new UrlHelper(new HttpRequestMessage(verb, controller.Request.Url.AbsoluteUri));
if (!url.Request.Properties.ContainsKey(HttpPropertyKeys.HttpConfigurationKey)) //http://stackoverflow.com/questions/11053598/how-to-mock-the-createresponset-extension-method-on-httprequestmessage
   url.Request.Properties.Add(HttpPropertyKeys.HttpConfigurationKey, new HttpConfiguration());

但这仍然会爆炸

System.ArgumentException was unhandled by user code
  HResult=-2147024809
  Message=A route named 'DefaultApi' could not be found in the route collection.
Parameter name: name
  Source=System.Web.Http
  ParamName=name
  StackTrace:
       at System.Web.Http.HttpRouteCollection.GetVirtualPath(HttpRequestMessage request, String name, IDictionary`2 values)
       at System.Web.Http.Routing.UrlHelper.GetHttpRouteHelper(HttpRequestMessage request, String routeName, IDictionary`2 routeValues)
       at System.Web.Http.Routing.UrlHelper.GetHttpRouteHelper(HttpRequestMessage request, String routeName, Object routeValues)
       at System.Web.Http.Routing.UrlHelper.Route(String routeName, Object routeValues)
       at MyProject.Models.ApiLinkMaker.MakeLink(String controller, String id) in w:\MyProject\Models\ApiLinkMaker.cs:line 42
       ...

这让我觉得我错了 - 我需要以某种方式从api路由配置创建url帮助器.

Answer 1

为什么创建一个？在MVC Controller和ApiController类上都有一个UriHelper实例作为属性公开.

    public ActionResult Index()
    {
        string url = Url.RouteUrl("DefaultApi", new {httproute = "", controller = "test"});
        return View();
    }

编辑:更新的代码.虽然url助手不同,但您可以使用MVC url助手来解析Web api url.

Edit2:如果你想从Mvc UrlHelper获取webapi路由,使用正确的方法是

string url = Url.HttpRouteUrl("DefaultApi", new {httproute = "", controller = "test"});