ASP.Net WebAPI 中的自定义路由处理程序

Question

我能够在 global.asax.cs 中为 Web API 路由 ala 成功注册自定义路由处理程序（从 IRouteHandler 派生）：

        routes.MapHttpRoute(
            name: "DefaultApi",
            routeTemplate: "{client}/api/1.0/{controller}/{action}/{id}",
            defaults: new{id = UrlParameter.Optional}
        ).RouteHandler = new SingleActionAPIRouteHandler();

但是，当我尝试为 API 设置内存主机以进行集成测试时，我似乎找不到执行此操作的方法，当我调用 HttpConfiguration.Routes.MapRoute 时，我无法在返回 IHttpRoute。

我应该以不同的方式执行此操作（例如使用自定义 HttpControllerSelector）吗？我显然希望在这两种情况下都以同样的方式进行。

谢谢， 马特

编辑：

所以我最终做的基本上是遵循下面的建议，只是简单地覆盖 HttpControllerDispatcher 类，如下所示：

public class CustomHttpControllerDispatcher : HttpControllerDispatcher
{
    public CustomHttpControllerDispatcher(HttpConfiguration configuration) : base(configuration)
    {
    }
    protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
    {
        // My stuff here

        return base.SendAsync(request, cancellationToken);
    }
}

Answer 1

你说的很对。自宿主返回 IHttpRoute 并以 HttpMessageHandler 作为参数。似乎没有内置方法来指定路由处理程序。

更新：更清楚一点

几乎可以肯定，您应该尝试使用 HttpControllerSelector 并实现自定义的...一个例子。 http://netmvc.blogspot.co.uk/

接下来是一些实验，如果 HttpControllerSelector 不能满足您的要求，无论出于何种原因...

但是，正如您所看到的，MapHttpRoute 确实对HttpMessageHandler 有重载，因此您可以对此进行试验...if the handler is NULL then it defaults to IHttpController 但您可以实现自己的并使用它来指向正确的控制器。 . MVC 框架似乎使用了[HttpControllerDispatcher]here，所以借用一些代码你也可以在这里放置你自己的控制器/路由选择代码——你可以访问路由和选择器，并且可以自己交换进出。

此 CustomHttpControllerDispatcher 代码仅用于 DEMO...查找行

//在这里做一些自定义来选择你的控制器

也许可以玩一下……

示例路线：

        config.Routes.MapHttpRoute(
            name: "DefaultApi",
            routeTemplate: "api/{controller}/{id}",
            defaults: new { id = RouteParameter.Optional },
            constraints: null,
            handler: new CustomHttpControllerDispatcher(config)
        );

CustomHttpControllerDispatcher 示例：

public class CustomHttpControllerDispatcher : HttpMessageHandler
{
        private IHttpControllerSelector _controllerSelector;
        private readonly HttpConfiguration _configuration;

        public CustomHttpControllerDispatcher(HttpConfiguration configuration)
        {
            _configuration = configuration;
        }

        public HttpConfiguration Configuration
        {
            get { return _configuration; }
        }

        private IHttpControllerSelector ControllerSelector
        {
            get
            {
                if (_controllerSelector == null)
                {
                    _controllerSelector = _configuration.Services.GetHttpControllerSelector();
                }
                return _controllerSelector;
            }
        }

        protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
        {
                return SendAsyncInternal(request, cancellationToken);
        }

        private Task<HttpResponseMessage> SendAsyncInternal(HttpRequestMessage request, CancellationToken cancellationToken)
        {

            IHttpRouteData routeData = request.GetRouteData();
            Contract.Assert(routeData != null);

            //DO SOMETHING CUSTOM HERE TO PICK YOUR CONTROLLER
            HttpControllerDescriptor httpControllerDescriptor = ControllerSelector.SelectController(request);
            IHttpController httpController = httpControllerDescriptor.CreateController(request);

            // Create context
            HttpControllerContext controllerContext = new HttpControllerContext(_configuration, routeData, request);
            controllerContext.Controller = httpController;
            controllerContext.ControllerDescriptor = httpControllerDescriptor;

            return httpController.ExecuteAsync(controllerContext, cancellationToken);
        }
}