似乎在下面使用的 LinkBuilder 根本没有使用 GetVirtualPatchForArea，正如我所读的那样，这是 MVC 错误。所以我决定制作自己的 HtmlHelper 使用该方法：
public static string ActionArea<TController>(this HtmlHelper urlHelper, Expression<Action<TController>> expression) where TController : Controller
{
RouteValueDictionary routeValues = GetRouteValuesFromExpression(expression);
VirtualPathData vpd = new UrlHelper(urlHelper.ViewContext.RequestContext).RouteCollection.GetVirtualPathForArea(urlHelper.ViewContext.RequestContext, routeValues);
return (vpd == null) ? null : vpd.VirtualPath;
}
public static string ActionArea<TController>(this UrlHelper urlHelper, Expression<Action<TController>> expression) where TController : Controller
{
RouteValueDictionary routeValues = GetRouteValuesFromExpression(expression);
VirtualPathData vpd = urlHelper.RouteCollection.GetVirtualPathForArea(urlHelper.RequestContext, routeValues);
return (vpd == null) ? null : vpd.VirtualPath;
}
public static RouteValueDictionary GetRouteValuesFromExpression<TController>(Expression<Action<TController>> action) where TController : Controller
{
if (action == null)
{
throw new ArgumentNullException("action");
}
MethodCallExpression call = action.Body as MethodCallExpression;
if (call == null)
{
throw new ArgumentException("Akcja nie może być pusta.", "action");
}
string controllerName = typeof(TController).Name;
if (!controllerName.EndsWith("Controller", StringComparison.OrdinalIgnoreCase))
{
throw new ArgumentException("Docelowa klasa nie jest kontrolerem.(Nie kończy się na 'Controller')", "action");
}
controllerName = controllerName.Substring(0, controllerName.Length - "Controller".Length);
if (controllerName.Length == 0)
{
throw new ArgumentException("Nie można przejść do kontrolera.", "action");
}
// TODO: How do we know that this method is even web callable?
// For now, we just let the call itself throw an exception.
string actionName = GetTargetActionName(call.Method);
var rvd = new RouteValueDictionary();
rvd.Add("Controller", controllerName);
rvd.Add("Action", actionName);
var namespaceNazwa = typeof(TController).Namespace;
if(namespaceNazwa.Contains("Areas."))
{
int index = namespaceNazwa.IndexOf('.',namespaceNazwa.IndexOf("Areas."));
string nazwaArea = namespaceNazwa.Substring(namespaceNazwa.IndexOf("Areas.") + 6, index - namespaceNazwa.IndexOf("Areas.") + 1);
if (!String.IsNullOrEmpty(nazwaArea))
{
rvd.Add("Area", nazwaArea);
}
}
//var typ = typeof(TController).GetCustomAttributes(typeof(ActionLinkAreaAttribute), true /* inherit */).FirstOrDefault();
/*ActionLinkAreaAttribute areaAttr = typ as ActionLinkAreaAttribute;
if (areaAttr != null)
{
string areaName = areaAttr.Area;
rvd.Add("Area", areaName);
}*/
AddParameterValuesFromExpressionToDictionary(rvd, call);
return rvd;
}
private static string GetTargetActionName(MethodInfo methodInfo)
{
string methodName = methodInfo.Name;
// do we know this not to be an action?
if (methodInfo.IsDefined(typeof(NonActionAttribute), true /* inherit */))
{
throw new InvalidOperationException(String.Format(CultureInfo.CurrentUICulture,
"Nie można wywoływać metod innych niż akcje.", methodName));
}
// has this been renamed?
ActionNameAttribute nameAttr = methodInfo.GetCustomAttributes(typeof(ActionNameAttribute), true /* inherit */).OfType<ActionNameAttribute>().FirstOrDefault();
if (nameAttr != null)
{
return nameAttr.Name;
}
// targeting an async action?
if (methodInfo.DeclaringType.IsSubclassOf(typeof(AsyncController)))
{
if (methodName.EndsWith("Async", StringComparison.OrdinalIgnoreCase))
{
return methodName.Substring(0, methodName.Length - "Async".Length);
}
if (methodName.EndsWith("Completed", StringComparison.OrdinalIgnoreCase))
{
throw new InvalidOperationException(String.Format(CultureInfo.CurrentUICulture,
"Nie można wywoływać kompletnych metod.", methodName));
}
}
// fallback
return methodName;
}
static void AddParameterValuesFromExpressionToDictionary(RouteValueDictionary rvd, MethodCallExpression call)
{
ParameterInfo[] parameters = call.Method.GetParameters();
if (parameters.Length > 0)
{
for (int i = 0; i < parameters.Length; i++)
{
Expression arg = call.Arguments[i];
object value = null;
ConstantExpression ce = arg as ConstantExpression;
if (ce != null)
{
// If argument is a constant expression, just get the value
value = ce.Value;
}
else
{
value = CachedExpressionCompiler.Evaluate(arg);
}
rvd.Add(parameters[i].Name, value);
}
}
}
希望这可以帮助有类似问题的人。上面的一些代码是我从 mvc2-rtm-sources 获得的，已根据我的需要修改http://aspnet.codeplex.com/releases/view/41742