how to get server.MapPath in asp.net core from inside a helper

Question

having a helper method like this:

 public static IHtmlContent Source(this IHtmlHelper html, string s)
 {
     var path = ServerMapPath() + "Views\\" + s;

I need to get the equivalent of Server.MapPath in asp.net core

Although late, see my answer to a similar question: https://stackoverflow.com/questions/30656089/reading-a-file-in-mvc-6/35459834#35459834. — Alexander Christov, Sep 28 '17 at 07:00

score 13 · Accepted Answer · edited Jul 20 '16 at 15:30

13

You need to inject IHostingEnvironment. Then:

var path = env.ContentRootPath + "Views\\" + s;

in an html helper you can do this:

((IHostingEnvironment)html.ViewContext.HttpContext.RequestServices.GetService(typeof(IHostingEnvironment))).ContentRootPath;

edited Jul 20 '16 at 15:30

Omu

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answered Jul 20 '16 at 14:45

regnauld

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found it like this: `((IHostingEnvironment)html.ViewContext.HttpContext.RequestServices.GetService(typeof(IHostingEnvironment))).ContentRootPath` – Omu Jul 20 '16 at 15:28
Better to use `Path.Combine` and not concatenation of strings – Sami Kuhmonen Nov 16 '17 at 07:21
One can use injection in a razor view: @inject IHostingEnvironment HostingEnvironment – Motlicek Petr Feb 05 '19 at 16:48
for now this is obsolete, use `IWebHostEnvironment` instead – anatol Jun 10 '21 at 12:48

Amir133 · Answer 2 · 2020-06-07T06:39:36.487

recommended Solution

I recommend Don't use a static class. You can keep something similar to your class, and register it as a singleton.

public class SourceClass
{
    private readonly IWebHostEnvironment _webHostEnvironment;

    public SourceClass (IWebHostEnvironment webHostEnvironment)
    {
         _webHostEnvironment= webHostEnvironment;
    }

    private IHtmlContent Source(this IHtmlHelper html, string s)
    {
        string contentRootPath = _webHostEnvironment.ContentRootPath;
        Path.Combine(contentRootPath,"Views",s)
    }
}

Then, in Startup.ConfigureServices:

services.AddSingleton<SourceClass>();

Finally, inject SourceClass where you need it, instead of just statically referencing the class.

Another Solution

(Note :@regnauld provided this solution, but it had some drawbacks, which I thought would be fully answered)

But if you want to use a static method you can do(Note: In .Net Core 3 IHostingEnvironment is absolute and IWebHostEnvironment must be used instead ):

for ServerPath ,use

((IWebHostEnvironment)html.ViewContext.HttpContext.RequestServices.GetService(typeof(IWebHostEnvironment))).ContentRootPath

OR

for WebRootPath (wwwroot) ,use

((IWebHostEnvironment)html.ViewContext.HttpContext.RequestServices.GetService(typeof(IWebHostEnvironment))).WebRootPath

in this answer you can find more details.

I also recommend that you use this code:

var path = Path.Combine(WebRootPath,"Views",s)

instead of

var path = WebRootPath + "Views\\" + s

to run the code on all operating systems.

how to get server.MapPath in asp.net core from inside a helper

2 Answers2

recommended Solution

Another Solution

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