我刚刚在我的 MVC 4 应用程序中更新了我的 Web API 包,以便我可以使用属性路由。当我添加时, config.MapHttpAttributeRoutes()
我收到一条错误消息,显示“对象尚未初始化。确保在所有其他初始化代码之后在应用程序的启动代码中调用 HttpConfiguration.EnsureInitialized()。” 如果我删除config.MapHttpAttributeRoutes()
Route 属性,一切都会像以前一样工作。如何解决此错误?
这是我的 WebApiConfig 类:
public static class WebApiConfig
{
public static void Register(HttpConfiguration config)
{
config.MapHttpAttributeRoutes();
config.Routes.MapHttpRoute(
name: "DefaultApi",
routeTemplate: "api/{controller}/{id}",
defaults: new { id = RouteParameter.Optional }
);
// Uncomment the following line of code to enable query support for actions with an IQueryable or IQueryable<T> return type.
// To avoid processing unexpected or malicious queries, use the validation settings on QueryableAttribute to validate incoming queries.
// For more information, visit http://go.microsoft.com/fwlink/?LinkId=279712.
//config.EnableQuerySupport();
}
}
以及错误详情:
该对象尚未初始化。确保在所有其他初始化代码之后在应用程序的启动代码中调用 HttpConfiguration.EnsureInitialized()。
说明:执行当前 Web 请求期间发生未处理的异常。请查看堆栈跟踪以获取有关错误及其源自代码的位置的更多信息。
异常详细信息:System.InvalidOperationException:对象尚未初始化。确保在所有其他初始化代码之后在应用程序的启动代码中调用 HttpConfiguration.EnsureInitialized()。
源错误:
在执行当前 Web 请求期间生成了未处理的异常。可以使用下面的异常堆栈跟踪来识别有关异常起源和位置的信息。
堆栈跟踪:
[InvalidOperationException: The object has not yet been initialized. Ensure that HttpConfiguration.EnsureInitialized() is called in the application's startup code after all other initialization code.]
System.Web.Http.Routing.RouteCollectionRoute.get_SubRoutes() +127
System.Web.Http.Routing.RouteCollectionRoute.GetRouteData(String virtualPathRoot, HttpRequestMessage request) +99
System.Web.Http.WebHost.Routing.HttpWebRoute.GetRouteData(HttpContextBase httpContext) +191
System.Web.Routing.RouteCollection.GetRouteData(HttpContextBase httpContext) +233
System.Web.Routing.UrlRoutingModule.PostResolveRequestCache(HttpContextBase context) +60
System.Web.Routing.UrlRoutingModule.OnApplicationPostResolveRequestCache(Object sender, EventArgs e) +82
System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +136
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +69