Asp.Net MVC：如何获取当前控制器/视图的虚拟 url？

Question

是否可以获取与控制器操作或视图关联的路由/虚拟 url？我看到 Preview 4 添加了 LinkBuilder.BuildUrlFromExpression 助手，但如果你想在 master 上使用它并不是很有用，因为控制器类型可以不同。任何想法表示赞赏。

Answer 1

这对我有用：

<%= this.Url.RouteUrl(this.ViewContext.RouteData.Values) %>

它返回当前的 Url； /Home/About

也许有更简单的方法来返回实际的路由字符串？

Answer 2

我总是尝试实施满足项目要求的最简单的解决方案。正如恩斯坦所说，“让事情尽可能简单，但不要简单。”尝试这个。

<%: Request.Path %>

Answer 3

您可以从 ViewContext.RouteData 中获取该数据。以下是一些有关如何访问（和使用）该信息的示例：

/// 这些被添加到我的 viewmasterpage、viewpage 和 viewusercontrol 基类中：

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);
}

/// 我在 UrlHelper 类中添加的一些扩展方法。

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);
    }

    /// <summary>
    /// Determines if the current request is on the specified controller
    /// </summary>
    /// <param name="helper">The helper.</param>
    /// <param name="controllerName">Name of the controller.</param>
    /// <returns>
    ///     <c>true</c> if the current view is on the specified controller; otherwise, <c>false</c>.
    /// </returns>
    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);
    }

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

Answer 4

我写了a helper class，它允许我访问路由参数。使用此帮助器，您可以获取控制器、操作以及传递给操作的所有参数。

Answer 5

您可以使用 从母版页中构建 URL。

您这样做是为了突出显示当前页面的标签或其他内容吗？

如果是这样，您可以从视图中使用 ViewContext 并获取您需要的值。