Razor Script Block Templated Delegate

Extensions.cs

private const string SCRIPTBLOCK_BUILDER = "ScriptBlockBuilder";

public static MvcHtmlString ScriptBlock(this WebViewPage webPage,
  Func<dynamic, HelperResult> template)
{
  if (!webPage.IsAjax)
  {
    var scriptBuilder = webPage.Context.Items[SCRIPTBLOCK_BUILDER] 
         as StringBuilder ?? new StringBuilder();

    scriptBuilder.Append(template(null).ToHtmlString());

    webPage.Context.Items[SCRIPTBLOCK_BUILDER] = scriptBuilder;

    return new MvcHtmlString(string.Empty);
  }
  return new MvcHtmlString(template(null).ToHtmlString());
}

public static MvcHtmlString WriteScriptBlocks(this WebViewPage webPage)
{
  var scriptBuilder = webPage.Context.Items[SCRIPTBLOCK_BUILDER] 
         as StringBuilder ?? new StringBuilder();

  return new MvcHtmlString(scriptBuilder.ToString());
}