当你看看源代码,操作链接你发现
<%= Html.ActionLink("LinkText", "Action", "Controller"); %>
将匹配
public static MvcHtmlString ActionLink(this HtmlHelper htmlHelper, string linkText, string actionName, string controllerName) {
return ActionLink(htmlHelper, linkText, actionName, controllerName, new RouteValueDictionary(), new RouteValueDictionary());
}
现在到目前为止,这看起来不错,因为它正在创造一个新的路径值字典,以便它不会将当前上下文中的值传递给新链接,这将会发生。
然而,在代码进一步下降,其中正在生成的网址:
public static string GenerateUrl(string routeName, string actionName, string controllerName, RouteValueDictionary routeValues, RouteCollection routeCollection, RequestContext requestContext, bool includeImplicitMvcValues) {
if (routeCollection == null) {
throw new ArgumentNullException("routeCollection");
}
if (requestContext == null) {
throw new ArgumentNullException("requestContext");
}
RouteValueDictionary mergedRouteValues = RouteValuesHelpers.MergeRouteValues(actionName, controllerName, requestContext.RouteData.Values, routeValues, includeImplicitMvcValues);
VirtualPathData vpd = routeCollection.GetVirtualPathForArea(requestContext, routeName, mergedRouteValues);
if (vpd == null) {
return null;
}
string modifiedUrl = PathHelpers.GenerateClientUrl(requestContext.HttpContext, vpd.VirtualPath);
return modifiedUrl;
}
可以看到的RequestContext被引用其中有访问的RouteData和routeCollections,其中将包含ID数据。当创建VirtualPathForArea,下面一行是其中的id值将出现在您的网址:
internal static VirtualPathData GetVirtualPathForArea(this RouteCollection routes, RequestContext requestContext, string name, RouteValueDictionary values, out bool usingAreas) {
if (routes == null) {
throw new ArgumentNullException("routes");
}
if (!String.IsNullOrEmpty(name)) {
// the route name is a stronger qualifier than the area name, so just pipe it through
usingAreas = false;
return routes.GetVirtualPath(requestContext, name, values);
}
string targetArea = null;
if (values != null) {
object targetAreaRawValue;
if (values.TryGetValue("area", out targetAreaRawValue)) {
targetArea = targetAreaRawValue as string;
}
else {
// set target area to current area
if (requestContext != null) {
targetArea = AreaHelpers.GetAreaName(requestContext.RouteData);
}
}
}
// need to apply a correction to the RVD if areas are in use
RouteValueDictionary correctedValues = values;
RouteCollection filteredRoutes = FilterRouteCollectionByArea(routes, targetArea, out usingAreas);
if (usingAreas) {
correctedValues = new RouteValueDictionary(values);
correctedValues.Remove("area");
}
VirtualPathData vpd = filteredRoutes.GetVirtualPath(requestContext, correctedValues);
return vpd;
}
行:
VirtualPathData vpd = filteredRoutes.GetVirtualPath(requestContext, correctedValues);
需要的虚拟路径(这只是路线)并返回它。因此,虚拟路径将是/Home/About/Flib
然后当返回的虚拟路径下面一行用它来设置客户端的URL跳转链接:
string modifiedUrl = PathHelpers.GenerateClientUrl(requestContext.HttpContext, vpd.VirtualPath);
所以几乎是它看起来像ActionLink的设置使用区域的虚拟路径,这只是匹配的路线,在这种情况下恰好是默认路线。
@Carl,@amurra:这是不是解决问题或者这只是中无法充分解决的症状的解释吗? – 2011-02-24 20:03:28
@Robert Koritnik - 这只是对ASP.NET MVC 2中发生了什么的解释。不知道这段代码是否随ASP.NET MVC 3发生了变化。 – amurra 2011-02-24 20:27:40
我不知道,老实说我并不在乎,因为我也使用MVC2 RTM(因为我必须使用.net 3.5)。所以我也有这个问题。但我做了这似乎工作:http://stackoverflow.com/questions/3475981/ambient-values-in-mvc2-net-routing/5110032#5110032 – 2011-02-24 20:30:33