Asp.Net MVC:كيفية تحديد ما إذا كنت حاليًا في عرض محدد

Question

أحتاج إلى تحديد ما إذا كنت على وجهة نظر معينة.حالة الاستخدام الخاصة بي هي أنني أرغب في تزيين عناصر التنقل بفئة "on" للعرض الحالي.هل هناك طريقة مدمجة للقيام بذلك؟

Answer 1

هنا ما أستخدمه.أعتقد أن هذا تم إنشاؤه بالفعل بواسطة قالب مشروع MVC في VS:

public static bool IsCurrentAction(this HtmlHelper helper, string actionName, string controllerName)
    {
        string currentControllerName = (string)helper.ViewContext.RouteData.Values["controller"];
        string currentActionName = (string)helper.ViewContext.RouteData.Values["action"];

        if (currentControllerName.Equals(controllerName, StringComparison.CurrentCultureIgnoreCase) && currentActionName.Equals(actionName, StringComparison.CurrentCultureIgnoreCase))
            return true;

        return false;
    }

Answer 2

الحل الحالي الخاص بي هو مع طرق التمديد:

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);
    }
}

Answer 3

هنا شيء مختلف قليلاً، استخدم FilterAttribute:

    [NavigationLocationFilter("Products")]
    public ViewResult List()
    {
        return View();
    }

...

public class NavigationLocationFilterAttribute : ActionFilterAttribute
{
    public string CurrentLocation { get; set; }

    public NavigationLocationFilterAttribute(string currentLocation)
    {
        CurrentLocation = currentLocation;
    }

    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        var controller = (Controller)filterContext.Controller;
        controller.ViewData.Add("NavigationLocation", CurrentLocation);
    }
}

...

وفي الرأي:

<%= ViewData["NavigationLocation"] %>