<p>I need to determine if I'm on a particular view.  My use case is that I'd like to decorate navigation elements with an "on" class for the current view.  Is there a built in way of doing this?</p>

My current solution is with extension methods:
```
```
public static class UrlHelperExtensions
{
    /// <summary>
    /// Determines if the current view equals the specified action
    /// </summary>
    /// <typeparam name="TController">The type of the controller.</typeparam>
    /// <param name="helper">Url Helper</param>
    /// <param name="action">The action to check.</param>
    /// <returns>
    ///     <c>true</c> if the specified action is the current view; otherwise, <c>false</c>.
    /// </returns>
    public static bool IsAction<TController>(this UrlHelper helper, LambdaExpression action) where TController : Controller
    {
        MethodCallExpression call = action.Body as MethodCallExpression;
        if (call == null)
        {
            throw new ArgumentException("Expression must be a method call", "action");
        }

        return (call.Method.Name.Equals(helper.ViewContext.ViewName, StringComparison.OrdinalIgnoreCase) &&
                typeof(TController) == helper.ViewContext.Controller.GetType());
    }

    /// <summary>
    /// Determines if the current view equals the specified action
    /// </summary>
    /// <param name="helper">Url Helper</param>
    /// <param name="actionName">Name of the action.</param>
    /// <returns>
    ///     <c>true</c> if the specified action is the current view; otherwise, <c>false</c>.
    /// </returns>
    public static bool IsAction(this UrlHelper helper, string actionName)
    {
        if (String.IsNullOrEmpty(actionName))
        {
            throw new ArgumentException("Please specify the name of the action", "actionName");
        }
        string controllerName = helper.ViewContext.RouteData.GetRequiredString("controller");
        return IsAction(helper, actionName, controllerName);
    }

    /// <summary>
    /// Determines if the current view equals the specified action
    /// </summary>
    /// <param name="helper">Url Helper</param>
    /// <param name="actionName">Name of the action.</param>
    /// <param name="controllerName">Name of the controller.</param>
    /// <returns>
    ///     <c>true</c> if the specified action is the current view; otherwise, <c>false</c>.
    /// </returns>
    public static bool IsAction(this UrlHelper helper, string actionName, string controllerName)
    {
        if (String.IsNullOrEmpty(actionName))
        {
            throw new ArgumentException("Please specify the name of the action", "actionName");
        }
        if (String.IsNullOrEmpty(controllerName))
        {
            throw new ArgumentException("Please specify the name of the controller", "controllerName");
        }

        if (!controllerName.EndsWith("Controller", StringComparison.OrdinalIgnoreCase))
        {
            controllerName = controllerName + "Controller";
        }

        bool isOnView = helper.ViewContext.ViewName.SafeEquals(actionName, StringComparison.OrdinalIgnoreCase);
        return isOnView && helper.ViewContext.Controller.GetType().Name.Equals(controllerName, StringComparison.OrdinalIgnoreCase);
    }
}
```
```