[英]Asp.Net MVC: How do I get virtual url for the current controller/view?
Is it possible to get the route/virtual url associated with a controller action or on a view? 是否可以获取与控制器操作或视图关联的路由/虚拟URL? I saw that Preview 4 added LinkBuilder.BuildUrlFromExpression helper, but it's not very useful if you want to use it on the master, since the controller type can be different.
我看到Preview 4添加了LinkBuilder.BuildUrlFromExpression助手,但如果你想在master上使用它,它不是很有用,因为控制器类型可能不同。 Any thoughts are appreciated.
任何想法都表示赞赏。
I always try to implement the simplest solution that meets the project requirements. 我总是尝试实施满足项目要求的最简单的解决方案。 As Enstein said, "Make things as simple as possible, but not simpler."
正如恩斯坦所说,“让事情变得尽可能简单,但并不简单。” Try this.
尝试这个。
<%: Request.Path %>
This worked for me: 这对我有用:
<%= this.Url.RouteUrl(this.ViewContext.RouteData.Values) %>
It returns the current Url as such; 它会返回当前的Url;
/Home/About
Maybe there is a simpler way to return the actual route string? 也许有一种更简单的方法来返回实际的路由字符串?
You can get that data from ViewContext.RouteData. 您可以从ViewContext.RouteData获取该数据。 Below are some examples for how to access (and use) that information:
以下是如何访问(和使用)该信息的一些示例:
/// These are added to my viewmasterpage, viewpage, and viewusercontrol base classes: ///这些被添加到我的viewmasterpage,viewpage和viewusercontrol基类:
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. ///我添加到UrlHelper类的一些扩展方法。
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());
}
}
You can use <%= Url.Action(action, controller, values) %> to build the URL from within the master page. 您可以使用<%= Url.Action(action,controller,values)%>从母版页中构建URL。
Are you doing this to maybe highlight a tab for the current page or something? 你这样做是为了突出当前页面的标签或什么?
If so you can use ViewContext from the view and get the values you need. 如果是这样,您可以从视图中使用ViewContext并获取所需的值。
I wrote a helper class that allows me to access the route parameters. 我写了一个帮助类 ,允许我访问路由参数。 With this helper, you can get the controller, action, and all parameters passed to the action.
使用此帮助程序,您可以获取控制器,操作以及传递给操作的所有参数。
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