如何在 Razor 助手中正确呈现助手？

Question

Imagine this scenario...

@helper TabTest()
{
    using (Html.BeginPortlet())
    {
        <strong>hello</strong>
    }
}

If I call it in the Razor file then it renders fine.

@TabTest()

Output: <div class="portlet"><strong>hello</strong></div>

If I call it using another helper... eg: @Html.RenderBootstrapTabContent(TabTest()) then the rendering is not the same.

Output:

<div class="portlet"></div>
<strong>hello</strong>

This is just a crude example and I've removed the redundant code to simplify. I assume it is something to do with the way the pipeline is written but I see no way to fix it.

I've read things about viewcontexts and textwriters but don't know how they would apply here.

The helper:

public static MvcHtmlString RenderBootstrapTabContent(this HtmlHelper helper, HelperResult content)
{
    return content.ToHtmlString();
}

The BeginPortlet method is custom and very similar to BeginForm and uses the IDisposable interface.

What can I do to fix this weird error?

Answer 1

Just in case my question didn't make sense to you I found someone else who did what I was trying to explain just without calling them in the same way. http://web.archive.org/web/20170504100102/http://jordanwallwork.co.uk/2012/07/nested-htmlhelpers-with-razor-and-using/

After reading everything I could online I still found no answer. It seems like perhaps nobody else has either tried this (or knew not to).

I finally fixed the issue by rewriting the RenderBootstrapTabContent method in the same way as BeginPortlet using a helper and IDisposable . So now instead of writing...

@Html.RenderBootstrapTabContent(TabTest())

I now use

using (Html.BeginBootstrapTabContent()) { @TabTest() }

I've wasted a lot of time over the last few days on this so I help this might help you.

If you've got a better idea please let me know.