Asp.Net MVC: How to determine if you're currently on a specific view

Question

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

Answer 1

My current solution is with extension methods:

public static class UrlHelperExtensions
{
    /// 

    /// Determines if the current view equals the specified action
    /// 
    /// The type of the controller.
    /// Url Helper
    /// The action to check.
    /// 
    ///     true if the specified action is the current view; otherwise, false.
    /// 
    public static bool IsAction(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());
    }

    /// 

    /// Determines if the current view equals the specified action
    /// 
    /// Url Helper
    /// Name of the action.
    /// 
    ///     true if the specified action is the current view; otherwise, false.
    /// 
    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);
    }

    /// 

    /// Determines if the current view equals the specified action
    /// 
    /// Url Helper
    /// Name of the action.
    /// Name of the controller.
    /// 
    ///     true if the specified action is the current view; otherwise, false.
    /// 
    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);
    }
}