How to generate URL in service layer of ASP.NET MVC 3 project

Question

I am looking for a simple way (if it exists) to generate a URL in a service class for a specified controller and action in an ASP.NET MVC 3 web application. I want to do this in the service layer because of needing to encode this URL in a QR code.

This is simple in a View or in a controller because of the UrlHelper available through System.Web.Mvc so I could create the beginning of the URL in the controller action that uses my service class but I was hoping to do it at the point of QR code generation.

Thanks in advance.

what code have you tried yourself so far.. can you post what you have tried..? — MethodMan
– MethodMan, Commented Aug 3, 2012 at 17:09

Eric J. · Accepted Answer · 2012-08-03 17:11:33Z

11

A major reason for having distinct layers is separation of concerns. The service layer should not concern itself with request routing.

I would pass the URL into the service layer and have the service layer return the generated QR code.

answered Aug 3, 2012 at 17:11

Eric J.

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4 Comments

Zasz Over a year ago

Yep, Use the Url helper in the controller, and pass it to the service layer as argument.

AJ. Over a year ago

Absolutely exactly precisely what I was thinking.

d456 Over a year ago

I wasn't sure if that was best or not. Thank you for your clarification.

VISHMAY Over a year ago

What if you have to send an email with a link to the application's endpoint, then you would need to construct the link in the service layer!

Twenty · Accepted Answer · 2023-04-01 17:33:01Z

5

I understand the separation of concerns but sometimes a developer has to do what a developer has to do!

So here is what I have done:

var Url = new UrlHelper(HttpContext.Current.Request.RequestContext);
var myUrl = Url.RouteUrl("routeName", new { controller="ControllerName", action="Index", area="", otherDictionaryEntries="otherId"});

edited Apr 1, 2023 at 17:33

Twenty

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answered Aug 7, 2013 at 0:28

Douglas Loyo

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1 Comment

Andreas Rudischhauser Over a year ago

This works only in the case when the service is used from a controller. Lets say you have a background task to send emails and you need the link inside that email... in that case you do not have a request or any http context.

Twenty · Accepted Answer · 2023-04-01 17:33:59Z

0

private readonly LinkGenerator _urlHelper;
private readonly IHttpContextAccessor _httpContextAccessor;

public MyUrlService(LinkGenerator urlHelper, IHttpContextAccessor httpContextAccessor)
{
    _urlHelper = urlHelper;
    _httpContextAccessor = httpContextAccessor;
}

public string MyCreateUrl() 
{ 
    var url = _urlHelper.GetUriByAction("Index1", "Home", new { param1 = "myparam1", param2 = "myparam2" }, _httpContextAccessor.HttpContext!.Request.Scheme, _httpContextAccessor.HttpContext.Request.Host); 
}

Url output:

"http://localhost:5241/Home/Index1?param1=myparam1&param2=myparam2"

We do not forget to add our services via Program.cs

builder.Services.AddHttpContextAccessor();

edited Apr 1, 2023 at 17:33

Twenty

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answered Mar 28, 2023 at 17:50

Kara

1

1 Comment

Andreas Rudischhauser Over a year ago

This works only in the case when the service is used from a controller. Lets say you have a background task to send emails and you need the link inside that email... in that case you do not have a request or any http context.

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