Asp.Net MVC: How do I get virtual url for the current controller/view?

Question

Is it possible to get the route/virtual url associated with a controller action or on a view? I saw that Preview 4 added LinkBuilder.BuildUrlFromExpression helper, but it\'

Answer 1

You can get that data from ViewContext.RouteData. Below are some examples for how to access (and use) that information:

/// These are added to my viewmasterpage, viewpage, and viewusercontrol base classes:

public bool IsController(string controller)
{
    if (ViewContext.RouteData.Values["controller"] != null)
    {
        return ViewContext.RouteData.Values["controller"].ToString().Equals(controller, StringComparison.OrdinalIgnoreCase);
    }
    return false;
}
public bool IsAction(string action)
{
    if (ViewContext.RouteData.Values["action"] != null)
    {
        return ViewContext.RouteData.Values["action"].ToString().Equals(action, StringComparison.OrdinalIgnoreCase);
    }
    return false;
}
public bool IsAction(string action, string controller)
{
    return IsController(controller) && IsAction(action);
}

/// Some extension methods that I added to the UrlHelper class.

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);
    }

    /// 

    /// Determines if the current request is on the specified controller
    /// 
    /// The helper.
    /// Name of the controller.
    /// 
    ///     true if the current view is on the specified controller; otherwise, false.
    /// 
    public static bool IsController(this UrlHelper helper, string controllerName)
    {
        if (String.IsNullOrEmpty(controllerName))
        {
            throw new ArgumentException("Please specify the name of the controller", "controllerName");
        }

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

        return helper.ViewContext.Controller.GetType().Name.Equals(controllerName, StringComparison.OrdinalIgnoreCase);
    }

    /// 

    /// Determines if the current request is on the specified controller
    /// 
    /// The type of the controller.
    /// The helper.
    /// 
    ///     true if the current view is on the specified controller; otherwise, false.
    /// 
    public static bool IsController(this UrlHelper helper) where TController : Controller
    {
        return (typeof(TController) == helper.ViewContext.Controller.GetType());
    }
}