.net - 从MVC3升级到MVC4后“Element not closed”错误

Question

Razor 2(与MVC4一起提供)似乎与Razor 1(来自MVC3)没有完全向后兼容。

自升级以来，我发现了一个错误:

The "td@Html.Raw(count" element was not closed. All elements must be either self-closing or have a matching end tag.

导致此的代码是:

<td@Html.Raw(count == null ? null : " class='has-item'")>

有什么解决方案？

Answer 1

Razor解析器已针对MVC 4 presumably because进行了重写:

The HTML5-specs clearly states that unclosed HTML-tags are supported, but Razor v1 didn't have an advanced enough parser to support this. Razor v2 now supports this with the elements listed in W3C's spec.

这里最简单的解决方案是在 @符号之前添加一个空格:

<td @Html.Raw(count == null ? null : " class='has-item'")>

但是，带有MVC 4的Razor中的条件属性具有更优雅的语法。

<td class="@(count == null ? null : "has-item")">

当属性值解析为 null时，该属性将从元素中省略。因此，此标记的输出为:

<td>

...或者...

<td class="has-item">