Question

我正在尝试通过Startup.cs中的以下代码让ASP.NET Core 2 MVC基于HTTP谓词来路由操作：

        app.UseMvc(routes =>
        {
            routes.MapRoute(
                name: "post",
                template: "api/{controller}/{id?}",
                defaults: new { action = "Post" },
                constraints: new RouteValueDictionary(new { httpMethod = new HttpMethodRouteConstraint("POST") })
            );
            routes.MapRoute(
                name: "delete",
                template: "api/{controller}/{id?}",
                defaults: new { action = "Delete" },
                constraints: new RouteValueDictionary(new { httpMethod = new HttpMethodRouteConstraint("DELETE") })
            );
            routes.MapRoute(
                name: "default",
                template: "api/{controller}/{action=Get}/{id?}");
        });

即，

如果客户端调用GET http://example.com/api/foo，则会在Get()类上运行FooController : Controller方法。
如果他们致电GET http://example.com/api/foo/123，则会在Get(int id)课程中运行FooController : Controller方法。
如果他们致电POST http://example.com/api/foo，则会在Post([FromBody] T postedItem)课程中运行FooController<T> : Controller方法。
如果他们致电POST http://example.com/api/foo/123，则会在Post(int id, [FromBody] T postedItem)课程中运行FooController<T> : Controller方法。
如果他们致电DELETE http://example.com/api/foo/123，则会在Delete(int id)

FooController : Controller

当我运行项目时，似乎没有运行任何控制器。我有一些Razor页面响应，但所有基于控制器的路由只返回404.即使默认路由似乎也不起作用。

我一直在使用https://github.com/ardalis/AspNetCoreRouteDebugger尝试帮助我缩小问题，但我仍然没有发现问题。它将控制器上的方法显示为可用操作，但不列出通过MapRoute添加的任何名称，模板或约束。我也很高兴知道任何其他有用的工具。

FWIW，我正在尝试使用与此处相同的动词约束： https://github.com/aspnet/Routing/blob/2.0.1/src/Microsoft.AspNetCore.Routing/RequestDelegateRouteBuilderExtensions.cs#L252-L268

Answer 1

所以我不记得究竟是什么问题，但元解决方案是你可以通过将日志级别从“信息”增加到“调试”来调试路由问题。例如，通过appsettings.json：

{
  "Logging": {
    "Debug": {
      "LogLevel": {
        "Default": "Debug"
      }
    },
    "Console": {
      "LogLevel": {
        "Default": "Debug"
      }
    }
  }
}

...然后您将在例如Visual Studio的“应用程序输出”窗格中获得此类消息：

[40m[37mdbug[39m[22m[49m: Microsoft.AspNetCore.Routing.RouteConstraintMatcher[1]
      Route value '(null)' with key 'httpMethod' did not match the constraint 'Microsoft.AspNetCore.Routing.Constraints.HttpMethodRouteConstraint'.
Microsoft.AspNetCore.Routing.RouteConstraintMatcher:Debug: Route value '(null)' with key 'httpMethod' did not match the constraint 'Microsoft.AspNetCore.Routing.Constraints.HttpMethodRouteConstraint'.
[40m[37mdbug[39m[22m[49m: Microsoft.AspNetCore.Routing.RouteBase[1]
      Request successfully matched the route with name 'get' and template 'api/{controller}/{id?}'.
Microsoft.AspNetCore.Routing.RouteBase:Debug: Request successfully matched the route with name 'get' and template 'api/{controller}/{id?}'.
[40m[37mdbug[39m[22m[49m: Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker[1]
      Executing action Contoso.Media.ServiceHost.Controllers.MediaController.Get (Contoso.Media.ServiceHost)
Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker:Debug: Executing action Contoso.Media.ServiceHost.Controllers.MediaController.Get (Contoso.Media.ServiceHost)

基于HTTP动词的路由动作？

1 个答案: