当前上下文错误中不存在名称“Url”

I have an MVC4 project that I am trying to create a helper for. I have added a folder called "App_Code", and in that folder I added a file called MyHelpers.cshtml. Here are the entire contents of that file:

我有一个MVC4项目,我正在尝试创建一个帮助器。我添加了一个名为“App_Code”的文件夹,在该文件夹中我添加了一个名为MyHelpers.cshtml的文件。以下是该文件的全部内容:

@helper MakeButton(string linkText, string actionName, string controllerName, string iconName, string classes) {
    <a href='@Url.Action(linkText,actionName,controllerName)' class="btn @classes">Primary link</a>
}

(I know there are some unused params, I'll get to those later after I get this fixed)

(我知道有一些未使用的参数,我会在我修复之后再找到它们)

I "cleaned" and built the solution, no errors.

我“清理”并构建解决方案,没有错误。

In the page that uses the helper, I added this code.

在使用帮助程序的页面中,我添加了此代码。

@MyHelpers.MakeButton("Back","CreateOffer","Merchant","","btn-primary")

When I attempt to run the project, I get the following error:

当我尝试运行该项目时,我收到以下错误:

Compiler Error Message: CS0103: The name 'Url' does not exist in the current context

编译器错误消息:CS0103:当前上下文中不存在名称“Url”

I can't seem to find the correct way to write this - what am I doing wrong? It seems to be correct as compared to examples I've seen on the web?

我似乎找不到写这个的正确方法 - 我做错了什么?与我在网上看到的例子相比,它似乎是正确的吗?

2 个解决方案

#1

As JeffB's link suggests, your helper file doesn't have access to the UrlHelper object.

正如JeffB的链接所示,您的帮助文件无法访问UrlHelper对象。

This is an example fix:

这是一个示例修复:

@helper MakeButton(string linkText, string actionName,
    string controllerName, string iconName, string classes) {

    System.Web.Mvc.UrlHelper urlHelper =
        new System.Web.Mvc.UrlHelper(Request.RequestContext);
    <a href='@urlHelper.Action(linkText,actionName,controllerName)'
        class="btn @classes">Primary link</a>
}

#2

For my helpers I create a base class:

对于我的助手,我创建了一个基类:

using System.Web.WebPages;
using System.Web.Mvc;

namespace MyProject
{
    public class HelperBase : HelperPage
    {
        public static new HtmlHelper Html
        {
            get { return ((WebViewPage)WebPageContext.Current.Page).Html; }
        }
        public static System.Web.Mvc.UrlHelper Url
        {
            get { return ((WebViewPage)WebPageContext.Current.Page).Url; }
        }
    }
}

And then in my helper I do (to use yours as an example):

然后在我的帮助下我做(以你的为例):

@inherits MyProject.HelperBase
@using System.Web.Mvc
@using System.Web.Mvc.Html

@helper MakeButton(string linkText, string actionName, string controllerName, string iconName, string classes) {
    <a href='@Html.ActionLink(linkText,actionName,controllerName)' class="btn @classes">Primary link</a>
}

Also, are you sure you didn't mean to use @Html.ActionLink (via LinkExtensions) instead of @Url.Action? The latter doesn't seem to have a linkText, actionName, controllerName overload, the former does?

另外,你确定你不是故意使用@ Html.ActionLink(通过LinkExtensions)而不是@ Url.Action吗?后者似乎没有linkText,actionName,controllerName重载,前者呢?

#1