Url.Link 在 Web Api 2 中引发未实现的异常

Question

我有以下控制器方法：

 [Authorize]
    public IHttpActionResult Post(AlertDataModel model)
    {
        var userID = this.User.Identity.GetUserId();
        var alert = new Alert
        {
            Content = model.Content,
            ExpirationDate = DateTime.Now.AddDays(5),
            UserId = userID
        };

        this.Data.Alerts.Add(alert);
        this.Data.SaveChanges();

        var returnedAlert = new AlertDataModel
        {
            ID = alert.ID,
            Content = alert.Content
        };
        var link = Url.Link(routeName: "DefaultApi", routeValues: new { id = alert.ID });
        var uri = new Uri(link);
        return Created(uri, returnedAlert);
    }

但是我在这一行得到了 NotImplementedException ：

var link = Url.Link(routeName: "DefaultApi", routeValues: new { id = alert.ID });

这是完整的错误：

Message: "An error has occurred."
ExceptionMessage: "The method or operation is not implemented."
ExceptionType: "System.NotImplementedException"
StackTrace: " at System.Web.HttpContextBase.get_Response()\ \ at System.Web.UI.Util.GetUrlWithApplicationPath(HttpContextBase context, String url)\ \ at System.Web.Routing.RouteCollection.NormalizeVirtualPath(RequestContext requestContext, String virtualPath)\ \ at System.Web.Routing.RouteCollection.GetVirtualPath(RequestContext requestContext, String name, RouteValueDictionary values)\ \ at System.Web.Http.WebHost.Routing.HostedHttpRouteCollection.GetVirtualPath(HttpRequestMessage request, String name, IDictionary`2 values)\ \ at System.Web.Http.Routing.UrlHelper.GetVirtualPath(HttpRequestMessage request, String routeName, IDictionary`2 routeValues)\ \ at System.Web.Http.Routing.UrlHelper.Route(String routeName, IDictionary`2 routeValues)\ \ at System.Web.Http.Routing.UrlHelper.Link(String routeName, IDictionary`2 routeValues)\ \ at System.Web.Http.Routing.UrlHelper.Link(String routeName, Object routeValues)\ \ at Exam.WebAPI.Controllers.AlertsController.Post(AlertDataModel model) in c:\\Users\\Kiril\\Desktop\\New folder\\Exam.WebAPI\\Controllers\\AlertsController.cs:line 63\ \ at lambda_method(Closure , Object , Object[] )\ \ at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClass10.<GetExecutor>b__9(Object instance, Object[] methodParameters)\ \ at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.Execute(Object instance, Object[] arguments)\ \ at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary`2 arguments, CancellationToken cancellationToken)\ \ --- End of stack trace from previous location where exception was thrown ---\ \ at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\ \ at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\ \ at System.Web.Http.Controllers.ApiControllerActionInvoker.<InvokeActionAsyncCore>d__0.MoveNext()\ \ --- End of stack trace from previous location where exception was thrown ---\ \ at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\ \ at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\ \ at System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__2.MoveNext()\ \ --- End of stack trace from previous location where exception was thrown ---\ \ at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\ \ at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\ \ at System.Web.Http.Filters.AuthorizationFilterAttribute.<ExecuteAuthorizationFilterAsyncCore>d__2.MoveNext()\ \ --- End of stack trace from previous location where exception was thrown ---\ \ at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\ \ at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\ \ at System.Web.Http.Controllers.AuthenticationFilterResult.<ExecuteAsync>d__0.MoveNext()\ \ --- End of stack trace from previous location where exception was thrown ---\ \ at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\ \ at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\ \ at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__1.MoveNext()"

我有以下路由：

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

我尝试反编译代码，在 ReflectedHttpActionDescriptor.ExecuteAsync 方法中抛出了错误。

有什么想法吗？

Answer 1

路线名称不正确。您需要使用特定名称装饰 api 方法上的路由属性，然后引用该名称。示例：

[Route(Template = "{id}", Name = "GetThingById")]
public IHttpActionResult Get(int id) {
     return Ok();
}

public IHttpActionResult DoStuff() {
    return Ok(Url.Link("GetThingById", new { id = 5 });
}

Answer 2

如果您使用的是 OWIN，请确保您在启动配置方法中使用了新的 HttpConfiguration 对象：

public class Startup
{
    public static OAuthAuthorizationServerOptions OAuthOptions { get; private set; }
    public static string PublicClientId { get; private set; }

    public void Configuration(IAppBuilder app)
    {
        var config = new HttpConfiguration();

        ConfigureWebApi(config);

        ConfigureAuth(app);

        app.UseWebApi(config);
    }

    ...

}

我花了几个小时才弄清楚在使用 OWIN 时不应该使用对 GlobalConfiguration 的引用：

GlobalConfiguration.Configure(WebApiConfig.Register);

Answer 3

我在我的 api 中使用 OWIN2 进行身份验证。 在 POST 操作中，我将 Location 添加到答案的标题中。 在生成要添加到标头的 URI 的行上引发错误。

    string uri = Url.Link("GetUserById.v2.0", new { id = newUser.Id });

即使我的 Get 用

装饰，也找不到我的路由名称“GetUserById.v2.0”

    [Route("{id:int}", Name = "GetUserById.v2.0")]

在我使用的 Startup.cs 中

    var config = GlobalConfiguration.Configuration;

配置我的 API。将此行更改为

    var config = new HttpConfiguration();

路线找到了，一切正常:-)