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Editorial Team
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Asked: 2026-05-16T22:09:43+00:00

I am migrating a web site to a new one using ASP .NET MVC2.

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I am migrating a web site to a new one using ASP .NET MVC2.

In the original site, master page has code-behind to check a query string parameter value. Depending on this value, code-behind dynamically modify some CSS property to hide / display master page elements.

As MVC2 has no code-behind because we are supposed to perform everything in the controllers, how should I proceed in this case ?

I see this : asp.net mvc modifying master file from a view

It partially answers my needs but the query string processing is common to all pages. How can I move this processing in a common code section ?

Regards.

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1 Answer

  1. Editorial Team

    A helper method looks like a good place:

    public static class HtmlHelperExtensions
{
    public static string GetCss(this HtmlHelper htmlHelper)
    {
        // read some request parameter
        // here you also have access to route data so the
        // parameter could be part of your custom routes as well
        var foo = htmlHelper.ViewContext.HttpContext.Request["foo"];

        // based on the value of this parameter 
        // return the appropriate CSS class
        return (foo == "bar") ? "barClass" : "fooClass";
    }
}

    And somewhere in your master page:

    <body class="<%= Html.GetCss() %>">

    Or if you are always going to apply it to the body tag only it might be more appropriate to do this in order to reduce the tag soup:

    public static class HtmlHelperExtensions
{
    public static MvcHtmlString StartBody(this HtmlHelper htmlHelper)
    {
        var body = new TagBuilder("body");
        var foo = htmlHelper.ViewContext.HttpContext.Request["foo"];
        var bodyClass = (foo == "bar") ? "barClass" : "fooClass";
        body.AddCssClass(bodyClass);
        return MvcHtmlString.Create(body.ToString(TagRenderMode.StartTag));
    }
}

    and in your master page at the place of the body tag:

    <%= Html.StartBody() %>
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