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Why is the HtmlHelper instance null in a Razor declarative @helper method?

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余生分开走
余生分开走 2020-12-15 15:22

Using MVC 3 RTM I\'m getting a strange NullReferenceException:

@helper TestHelperMethod() {
    var extra = \"class=\\\"foo\\\"\";
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  • 谎友^
    谎友^ (楼主)
    2020-12-15 15:56

    That's a known limitation of those helpers. One possibility is to pass it as parameter:

    @helper TestHelperMethod(HtmlHelper html) {
    var extra = "class=\"foo\"";
    }

    Another possibility is to write the helper as an extension method:

    public static class HtmlExtensions
{
    public static MvcHtmlString TestHelperMethod(this HtmlHelper)
    {
        var div = new TagBuilder("div");
        div.AddCssClass("foo");
        return MvcHtmlString.Create(div.ToString());
    }
}

    and then:

    @Html.TestHelperMethod()

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