Question

我有一个帮手，我可以这样打电话，没问题：

Helpers.Truncate(post.Content, 100);

但是当我在@Html.ActionLink中调用它时，我收到以下错误：

Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately. 

Compiler Error Message: CS1928: 'System.Web.Mvc.HtmlHelper<System.Collections.Generic.IEnumerable<TRN.DAL.Post>>' does not contain a definition for 'ActionLink' and the best extension method overload 'System.Web.Mvc.Html.LinkExtensions.ActionLink(System.Web.Mvc.HtmlHelper, string, string, object, object)' has some invalid arguments

这是受影响的代码：

@foreach (var post in Model)
{
    <li>
        @Html.ActionLink(Helpers.Truncate(post.Content, 100), "Topic", new { TopicID = post.TopicID }, null)
        <p>By @Html.ActionLink(post.Username, "Members", new { MemberID = post.MemberID }, null) on @post.CreatedOn</p>
    </li>
}

我的帮助程序代码位于App_Code \ Helpers.cshtml中，代码如下：

@helper Truncate(string input, int length)
{
    if (input.Length <= length)
    {
        @input
    }
    else
    {
        @input.Substring(0, length)<text>...</text>
    }
}

Answer 1

试试这个：

@Html.ActionLink(Truncate(post.Content, 100).ToString(), "Home")

@helper Truncate(string input, int length)
{
    if (input.Length <= length)
    {
        @Html.Raw(input)
    }
    else
    {
         @Html.Raw(input.Substring(0, length) + "...")
    }
}

Answer 2

我建议将帮助函数更改为您选择的类中的静态函数。例如：

public static string Truncate(string input, int length)
{
    if (input.Length <= length)
    {
        return input;
    }
    else
    {
        return input.Substring(0, length) + "...";
    }
}

您在视图中使用：

@Html.Actionlink(MyNamespace.MyClass.Truncate(input, 100), ...

您可以选择将此功能更改为string的扩展名，有很多关于如何执行此操作的示例：

public static string Truncate(this string input, int length) ...

MVC Razor：Helper导致html.actionlink

2 个答案: