ASP.NET MVC3 Razor语法帮助 - 我陷入无限循环

时间:2010-11-22 16:54:55

标签: asp.net-mvc asp.net-mvc-2 asp.net-mvc-3 razor

我正在尝试将小型mvc2应用程序转换为mvc3 razor语法。在我的mvc2应用程序中,我使用带有母版页的aspx视图引擎。按照Steven Sanderson的Pro MVC2第2版的例子,在母版页中我调用了一个控制器动作,为每个实体呈现局部视图。这工作正常。

 <div id="categories">
    <% Html.RenderAction("Menu", "Nav"); %>
</div>

使用_layout.cshtml和razor我正在尝试这个。这就是我的问题所在。

 <div id="categories">
    @{ 
        Html.RenderAction("Menu", "Nav"); 

    }
</div>

这导致了一个无限循环,而且我得到了一个奇怪的StackOverflowException。任何人都可以帮我纠正这个问题吗?这是控制器方法代码。

  public ViewResult Menu(string personId)
    {
        Func<string, NavLink> makeLink = pId => new NavLink
        {
            Text = pId ?? "Home"
            , RouteValues = new RouteValueDictionary(new { controller = "Person", action = "Person"})

        };

        List<NavLink> navLinks = new List<NavLink> {makeLink(null)};


        Func<Person, NavLink> makeLink2 = p => new NavLink
        {
            Text = p.Name ?? "Home"
            , RouteValues = new RouteValueDictionary(new { controller = "Person", action = "Person", personId = p.Id })

        };

        var people = usersRepository.People.OrderBy(x => x.Name);
        var peopleLinks = EnumerableHelpers.MakeLinks(people, makeLink2);

        navLinks.AddRange(peopleLinks);

        return View("_menu", navLinks);
    }

非常感谢任何帮助或提示。

谢谢,
〜在圣地亚哥

4 个答案:

答案 0 :(得分:23)

您没有发布实际的堆栈跟踪,但是从描述中我猜测您的recurssion是在运行布局页面的“部分”操作视图中,这会呈现操作,从而呈现布局等。

尝试从您的子操作方法而不是PartialView返回View。这将阻止执行_ViewStart页面,这将阻止为您的子操作呈现布局。关于这方面的更多讨论在这里:http://forums.asp.net/t/1624687.aspx

答案 1 :(得分:3)

@{
    Layout = string.Empty;
} 

在您的部分视图顶部。

答案 2 :(得分:1)

首先,你的personId参数从未使用过(无论如何都是正确路由的)?

但我肯定会从查看EnumerableHelpers.MakeLinks开始 它是隐藏递归问题的最佳位置尝试在那里设置断点

因为我使用的是

型号:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace MvcApplication1.Controllers
{
    public class Person
    {
    public int Id { get; set; }
    public string Name { get; set; }
}
public class EnumerableHelpers
{

    internal static List<NavLink> MakeLinks(IOrderedEnumerable<Person> people, Func<Person, NavLink> makeLink2)
    {
      var retVal = new List<NavLink>  ();
      foreach (var item in people)
      {
          retVal.Add(makeLink2(item));
      }
      return retVal;
    }
}
public class usersRepository
{
    private static List<Person> people = new List<Person>();
    public usersRepository()
    {


    }
    public static List<Person> People
    {
        get
        {
            people = new List<Person>()  {
                 new Person() { Id = 1,  Name = "carley" },
                 new Person() { Id = 2,  Name = "mark" },
             };
            return people;
        }
        set
        {
            people = value;
        }
    }


}

public class NavLink
{
    public System.Web.Routing.RouteValueDictionary RouteValues { get; set; }
    public string Text { get; set; }
}
}

查看

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;

    namespace MvcApplication1.Controllers
    {
        public class Person
        {
            public int Id { get; set; }
            public string Name { get; set; }
        }
        public class EnumerableHelpers
        {

            internal static List<NavLink> MakeLinks(IOrderedEnumerable<Person> people, Func<Person, NavLink> makeLink2)
            {
              var retVal = new List<NavLink>  ();
              foreach (var item in people)
              {
                  retVal.Add(makeLink2(item));
              }
              return retVal;
            }
        }
        public class usersRepository
        {
            private static List<Person> people = new List<Person>();
            public usersRepository()
            {


            }
            public static List<Person> People
            {
                get
                {
                    people = new List<Person>()  {
                         new Person() { Id = 1,  Name = "carley" },
                         new Person() { Id = 2,  Name = "mark" },
                     };
                    return people;
                }
                set
                {
                    people = value;
                }
            }


        }

        public class NavLink
        {
            public System.Web.Routing.RouteValueDictionary RouteValues { get; set; }
            public string Text { get; set; }
        }
    }

控制器

public ViewResult Menu(string id)
     {
        Func<string, NavLink> makeLink = pId => new NavLink
        {
            Text = pId ?? "Home"
            ,
            RouteValues = new RouteValueDictionary(new { controller = "Person", action = "Person" })

        };

        List<NavLink> navLinks = new List<NavLink> { makeLink(null) };


        Func<Person, NavLink> makeLink2 = p => new NavLink
        {
            Text = p.Name ?? "Home"
            ,
            RouteValues = new RouteValueDictionary(new { controller = "Person", action = "Person", personId = p.Id })

        };

        var people = usersRepository.People.OrderBy(x => x.Name);
        var peopleLinks = EnumerableHelpers.MakeLinks(people, makeLink2);

        navLinks.AddRange(peopleLinks);

        return View(navLinks);
    }

呈现

                                   文本                                             
controllerPerson
actionPerson                      家                                             
控制器人员诉讼人员人员1                      卡利                                             
控制器人员诉讼人员人员2                      标记

答案 3 :(得分:1)

尝试这样做(而不是RenderAction)

@Html.Action("Menu", "Nav")

菜单视图中有什么?有什么东西可以导致递归吗?