I'm currently trying to do something that was dead simple and straight forward in ASP.NET 4 however this ins't the case now in ASP.NET 5.
Previously to use the UrlHelper it was dead simple:
var urlHelper = new UrlHelper(HttpContext.Current.Request.RequestContext);
However I can't for the life of me wrap my head around how to use the new UrlHelper. I'm looking at the test cases and either I'm completely daft or I'm missing something and I can't seem to figure it out. Any help here in clearing up this would be great.
Update - Post RC2
As @deebo mentioned, you no longer can get an IUrlHelper
directly from DI. Instead you need to inject an IUrlHelperFactory
and an IActionContextAccessor
into your class and use them to get the IUrlHelper
instance as in:
public MyClass(IUrlHelperFactory urlHelperFactory, IActionContextAccessor actionAccessor)
{
this.urlHelperFactory = urlHelperFactory;
this.actionAccessor = actionAccessor;
}
public void SomeMethod()
{
var urlHelper = this.urlHelperFactory.GetUrlHelper(this.actionAccessor.ActionContext);
}
You need to also register the in your startup class (IUrlHelperFactory
is already registered by default):
services.AddSingleton<IActionContextAccessor, ActionContextAccessor>();
Bear in mind this will only work as long as the code where you get the actionContext is running after the MVC/routing middleware! (Otherwise actionAccessor.ActionContext
would be null)
I have retrieved the IUrlHelper
using the IServiceProvider
in HttpContext.RequestServices
.
Usually you will have an HttpContext
property at hand:
In a controller action method you can do:
var urlHelper = this.Context.RequestServices.GetRequiredService<IUrlHelper>();
ViewBag.Url = urlHelper.Action("Contact", "Home", new { foo = 1 });
In a filter you can do:
public void OnActionExecuted(ActionExecutedContext context)
{
var urlHelper = context.HttpContext.RequestServices.GetRequiredService<IUrlHelper>();
var actionUrl = urlHelper.Action("Contact", "Home", new { foo = 1 });
//use actionUrl ...
}
Another option would be taking advantage of the built-in dependency injection, for example your controller could have a constructor like the following one and at runtime an IUrlHelper
instance will be provided:
private IUrlHelper _urlHelper;
public HomeController(IUrlHelper urlHelper)
{
_urlHelper = urlHelper;
}
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