active menu item – asp.net mvc3 master page

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A custom HTML helper usually does the job fine:

public static MvcHtmlString MenuLink(
    this HtmlHelper htmlHelper, 
    string linkText, 
    string actionName, 
    string controllerName
)
{
    string currentAction = htmlHelper.ViewContext.RouteData.GetRequiredString("action");
    string currentController = htmlHelper.ViewContext.RouteData.GetRequiredString("controller");
    if (actionName == currentAction && controllerName == currentController)
    {
        return htmlHelper.ActionLink(
            linkText,
            actionName,
            controllerName,
            null,
            new {
                @class = "current"
            });
    }
    return htmlHelper.ActionLink(linkText, actionName, controllerName);
}

and in your master page:

<ul>
    <li>@Html.MenuLink("Link 1", "link1", "Home")</li>
    <li>@Html.MenuLink("Link 2", "link2", "Home")</li>
</ul>

Now all that’s left is define the .current CSS class.

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