路由参数的ASP.Net MVC RouteAttribute错误

时间:2016-08-26 23:43:45

标签: c# asp.net asp.net-mvc asp.net-mvc-routing

我在尝试将路线映射添加到特定操作时遇到了很多不同的错误!

我试图为GET /Admin/Users/User/1获取这条路线 和POST /Admin/Users/User

但遗憾的是Controller中已有一个User属性! 所以我不能使用public ActionResult User(long id),因为我需要隐藏用户属性(我需要保留,因为它是控制器的IPrincipal,我仍然得到相同的错误)。

以这种方式定义路线:

// First in RouteConfig
routes.MapMvcAttributeRoutes();

routes.MapRoute(
    name: "Default",
    url: "{controller}/{action}/{id}",
    defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
);

// Then i'm registering my Areas.

此控制器位于管理区域中。 UsersController:Controller

[HttpGet]
[Route(Name = "User/{id:long}")]
public ActionResult GetUser(long id)
{
    var model = new UserViewModel
    {
        User = _usersService.GetUser(id),
        Roles = _rolesService.GetRoleDropdown()
    };

    return View("User");
}

[HttpPost]
[Route(Name = "User")]
public ActionResult GetUser(UserViewModel model)
{
    if (ModelState.IsValid)
    {
        _usersService.UpdateUserRoles(model.User);
        return RedirectToAction("Index");
    }

    return View("User", model);
}

以下是我得到的错误:

The parameters dictionary contains a null entry for parameter 'id' of non-nullable type 'System.Int64' for method 'System.Web.Mvc.ActionResult User(Int64)' in 'MyProjectName.Web.Areas.Admin.Controllers.UsersController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter. Parameter name: parameters

我不确定真正明白错误!

我查看了这个解释属性的页面,我没有看错 https://blogs.msdn.microsoft.com/webdev/2013/10/17/attribute-routing-in-asp-net-mvc-5/

编辑1

它仍然无法正常工作,我将注册更改为

routes.MapMvcAttributeRoutes();

AreaRegistration.RegisterAllAreas();

routes.MapRoute(
    name: "Default",
    url: "{controller}/{action}/{id}",
    defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
);

这是我的完整控制器代码,因为它现在不能用于我的初始代码中没有的索引操作。

[RouteArea("Admin")]
[RoutePrefix("Users")]
public class UsersController : Controller
{
    private readonly IUsersService _usersService;
    private readonly IRolesService _rolesService;

    public UsersController(
        IUsersService usersService,
        IRolesService rolesService)
    {
        _usersService = usersService;
        _rolesService = rolesService;
    }

    [HttpGet]
    [Route(Name = "Index")]
    public ActionResult Index()
    {
        var model = new UsersViewModel
        {
            Users = _usersService.GetUsers()
        };

        return View(model);
    }

    [HttpGet]
    [Route(Name = "User/{id:long}")]
    public new ActionResult User(long id)
    {
        var model = new UserViewModel
        {
            User = _usersService.GetUser(id),
            Roles = _rolesService.GetRoleDropdown()
        };

        return View("User");
    }

    [HttpPost]
    [Route(Name = "User")]
    public new ActionResult User(UserViewModel model)
    {
        if (ModelState.IsValid)
        {
            _usersService.UpdateUserRoles(model.User);
            return RedirectToAction("Index");
        }

        return View("User", model);
    }
}

现在,我在尝试进行索引操作时得到了:

  

以下操作方法之间的当前请求不明确:   System.Web.Mvc.ActionResult索引()类型   EspaceBiere.Web.Areas.Admin.Controllers.UsersController   System.Web.Mvc.ActionResult类型的用户(Int64)   EspaceBiere.Web.Areas.Admin.Controllers.UsersController   System.Web.Mvc.ActionResult   用户(EspaceBiere.Web.Areas.Admin.ViewModels.Users.UserViewModel)上   键入EspaceBiere.Web.Areas.Admin.Controllers.UsersController

并尝试转到用户操作

  

公共行动方法'用户'在控制器上找不到   ' EspaceBiere.Web.Areas.Admin.Controllers.UsersController'

我对索引操作的链接是:

尝试使用/Admin/Users代替Index操作

尝试使用/Admin/Users/User/1进行User操作

编辑2

好的,我的索引现在运行正常,但我的用户操作仍无效! 我已删除RouteAttribute的所有Name属性,以将它们保留在构造函数中(作为模板) - > 〔路线("用户/ {ID:长}&#34)]

抱歉,如果我第一次看到它时没有看到它们!

以下是操作的链接

                    <a href="@Url.Action("User", "Users", new { Area = "Admin", id = user.UserId })" class="btn btn-warning">
                    <i class="fa fa-pencil"></i>
                </a>

这是错误

No matching action was found on controller 'EspaceBiere.Web.Areas.Admin.Controllers.UsersController'. This can happen when a controller uses RouteAttribute for routing, but no action on that controller matches the request.

如果我在URL / Admin / Users / User / 1中写入,它确实有效 那我该怎么写我的Url.Action?

2 个答案:

答案 0 :(得分:1)

如果这是您的意图,您还没有完全理解使用属性路由的概念。以下是如何配置所需路线的示例。

[RouteArea("Admin")]
[RoutePrefix("Users")]
public class UsersController : Controller {
    private readonly IUsersService _usersService;
    private readonly IRolesService _rolesService;

    public UsersController(
        IUsersService usersService,
        IRolesService rolesService) {
        _usersService = usersService;
        _rolesService = rolesService;
    }

    //GET Admin/Users
    //GET Admin/Users/Index
    [HttpGet]
    [Route("")]
    [Route("Index")]
    public ActionResult Index() {
        var model = new UsersViewModel {
            Users = _usersService.GetUsers()
        };

        return View(model);
    }

    //GET Admin/Users/User/1
    [HttpGet]
    [Route("User/{id:long}", Name = "GetUser")]
    public ActionResult GetUser(long id) {
        var model = new UserViewModel {
            User = _usersService.GetUser(id),
            Roles = _rolesService.GetRoleDropdown()
        };

        return View("User");
    }

    //POST Admin/Users/User
    [HttpPost]
    [Route("User")]
    public ActionResult PostUser(UserViewModel model) {
        if (ModelState.IsValid) {
            _usersService.UpdateUserRoles(model.User);
            return RedirectToAction("Index");
        }

        return View("User", model);
    }
}
  

如果您同时使用具有路径属性的区域和带有的区域   基于约定的路由(由AreaRegistration类设置),然后你   需要确保在MVC属性之后进行区域注册   但是,在默认基于约定之前配置路由   路线设定。原因是应该订购路线登记   从最具体(属性)到更一般(区域   注册)以雾通用(默认路由)来避免泛型   通过匹配传入来“隐藏”更具体路线的路线   在管道中要求太早。

// First in RouteConfig
routes.MapMvcAttributeRoutes();

// Then register Areas.
AreaRegistration.RegisterAllAreas();

routes.MapRoute(
    name: "Default",
    url: "{controller}/{action}/{id}",
    defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
);
  

路线名称

     

您可以指定路由的名称,以便轻松允许URI   一代人。例如,对于以下路线:

[Route("User/{id:long}", Name = "GetUser")]
public ActionResult GetUser(long id)

您可以使用 Url.RouteUrl 生成链接:

<a href="@Url.RouteUrl("GetUser", new { Area = "Admin", id = user.UserId })" class="btn btn-warning">
    <i class="fa fa-pencil"></i>
</a>

答案 1 :(得分:-1)

很好,

    [HttpPost]
    [Route("User")]
    public ActionResult PostUser(UserViewModel model) {
        if (ModelState.IsValid) {
            _usersService.UpdateUserRoles(model.User);
            return RedirectToAction("Index");
        }enter code here

        return View("User", model);
    }
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