参数字典包含方法'system.web.mvc.actionresult languageedit（int32）的非可空类型'system.int32'的参数'id'的空条目 [英] The parameters dictionary contains a null entry for parameter 'id' of non-nullable type 'system.int32' for method 'system.web.mvc.actionresult languageedit(int32)

问题描述

我在控制器中有一个操作方法 CountryController.cs

I have a action method in the controller CountryController.cs

public ActionResult LanguageEdit(int id)
       {

另外要导航到它，

Also to navigate to it,

@Html.ActionLink("Edit", "LanguageEdit", "Country", new { id = item.LanguageId }

我检查了价值

I checked the value

item.LanguageId

它是4.但是我收到了例外：

It is 4. But I received the exception:

The parameters dictionary contains a null entry for parameter 'id' of non-nullable type 'System.Int32' for method 'System.Web.Mvc.ActionResult LanguageEdit(Int32)

为什么？



我的尝试：



我的路线配置是：

Why?

What I have tried:

My route's configuration is:

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

推荐答案

你可能会想试试

You might want to try

@Html.ActionLink("Edit", "LanguageEdit", "Country", new { id = item.LanguageId }, null)

而不是

如果你检查 ActionLink重载列表你会看到没有断言链接文本，动作名称，控制器名称和路由值dictionary.But有一个接受那些params和html属性字典

instead
If you check List of ActionLink overloads you'll see that there is none wich assepts link text, action name, controller name and route values dictionary.But there is one which accepts those params and html attributes dictionary

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