What is the equivalent of Server.MapPath in ASP.NET Core?

Question

I have this line in some code I want to copy into my controller, but the compiler complains that

The name 'Server' does not exist in the current context

var UploadPath = Server.MapPath("~/App_Data/uploads")

How can I achieve the equivalent in ASP.NET Core?

Answer 1

Here is a fantastic solution from Rick Strahl

It uses an HttpContext extension to accomplish: @HttpContext.MapPath("~/test/error.html")

Answer 2

.NET 6 (.NET Core 3 and above)

For example, I want to locate ~/wwwroot/CSS

public class YourController : Controller
{
    private readonly IWebHostEnvironment _webHostEnvironment;

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

    public IActionResult Index()
    {
        string webRootPath = _webHostEnvironment.WebRootPath;
        string contentRootPath = _webHostEnvironment.ContentRootPath;

        string path ="";
        path = Path.Combine(webRootPath , "CSS");
        //or path = Path.Combine(contentRootPath , "wwwroot" ,"CSS" );
        return View();
    }
}

---

Some Tricks

Also if you don't have a controller or service, follow the last Part and register its class as a singleton. Then, in Startup.ConfigureServices:

services.AddSingleton<your_class_Name>();

Finally, inject your_class_Name where you need it.

---

.NET Core 2

For example, I want to locate ~/wwwroot/CSS

public class YourController : Controller
{
    private readonly IHostingEnvironment _HostEnvironment; //difference is here : IHostingEnvironment  vs I*Web*HostEnvironment 

    public YourController (IHostingEnvironment HostEnvironment)
    {
        _HostEnvironment= HostEnvironment;
    }

    public ActionResult Index()
    {
        string webRootPath = _HostEnvironment.WebRootPath;
        string contentRootPath = _HostEnvironment.ContentRootPath;

        string path ="";
        path = Path.Combine(webRootPath , "CSS");
        //or path = Path.Combine(contentRootPath , "wwwroot" ,"CSS" );
        return View();
    }
}

---

MoreDetails

Thanks to @Ashin but IHostingEnvironment is obsoleted in MVC Core 3!!

According to this :

Obsolete types (warning):

Microsoft.Extensions.Hosting.IHostingEnvironment
Microsoft.AspNetCore.Hosting.IHostingEnvironment
Microsoft.Extensions.Hosting.IApplicationLifetime
Microsoft.AspNetCore.Hosting.IApplicationLifetime
Microsoft.Extensions.Hosting.EnvironmentName
Microsoft.AspNetCore.Hosting.EnvironmentName

New types:

Microsoft.Extensions.Hosting.IHostEnvironment
Microsoft.AspNetCore.Hosting.IWebHostEnvironment : IHostEnvironment
Microsoft.Extensions.Hosting.IHostApplicationLifetime
Microsoft.Extensions.Hosting.Environments 

So you must use IWebHostEnvironment instead of IHostingEnvironment.

Answer 3

UPDATE: IHostingEnvironment is deprecated. See update below.

In Asp.NET Core 2.2 and below, the hosting environment has been abstracted using the interface, IHostingEnvironment

The ContentRootPath property will give you access to the absolute path to the application content files.

You may also use the property, WebRootPath if you would like to access the web-servable root path (www folder by default)

You may inject this dependency into your controller and access it as follows:

public class HomeController : Controller
{
    private readonly IHostingEnvironment _hostingEnvironment;

    public HomeController(IHostingEnvironment hostingEnvironment)
    {
        _hostingEnvironment = hostingEnvironment;
    }

    public ActionResult Index()
    {
        string webRootPath = _hostingEnvironment.WebRootPath;
        string contentRootPath = _hostingEnvironment.ContentRootPath;

        return Content(webRootPath + "\n" + contentRootPath);
    }
}

UPDATE - .NET CORE 3.0 and Above

IHostingEnvironment has been marked obsolete with .NET Core 3.0 as pointed out by @amir133. You should be using IWebHostEnvironment instead of IHostingEnvironment. Please refer to that answer below.

Microsoft has neatly segregated the host environment properties among these interfaces. Please refer to the interface definition below:

namespace Microsoft.Extensions.Hosting
{
  public interface IHostEnvironment
  {
    string EnvironmentName { get; set; }
    string ApplicationName { get; set; }
    string ContentRootPath { get; set; }
    IFileProvider ContentRootFileProvider { get; set; }
  }
}

namespace Microsoft.AspNetCore.Hosting
{
  public interface IWebHostEnvironment : IHostEnvironment
  {
    string WebRootPath { get; set; }
    IFileProvider WebRootFileProvider { get; set; }
  }
}

Answer 4

I don't think I've seen this mentioned yet:

var webPath = WebHostEnvironment.WebRootFileProvider.GetFileInfo(path).PhysicalPath;
var contentPath = WebHostEnvironment.ContentRootFileProvider.GetFileInfo(path).PhysicalPath;

(As mentioned in another answer, WebHostEnvironment would be an instance of IWebHostEnvironment that gets injected via the constructor.)

The path in this case could be something like "/some/folder" or "/some/file".

Some pros and cons:

• The file/folder may have to exist for these methods to return the path (though my testing showed each method handled these differently).
• This ought to provide a bit more defensive coding around things like paths that are formed in a way to gain access to files outside of the website folder. Using Path.Combine would not offer this safety.

Answer 5

The accepted answer's suggestion is good enough in most scenarios, however - since it depends on Dependency Injection - is limited to Controllers and Views: in order to have a proper Server.MapPath replacement that can be accessed from non-singleton helper classes we can add the following line(s) of code at the end of the Configure() method of the app's Startup.cs file:

// setup app's root folders
AppDomain.CurrentDomain.SetData("ContentRootPath", env.ContentRootPath);
AppDomain.CurrentDomain.SetData("WebRootPath", env.WebRootPath);

This way we'll be able to retrieve them from within any class (including, yet not limiting to, Controllers and Views) in the following way:

var contentRootPath = (string)AppDomain.CurrentDomain.GetData("ContentRootPath");
var webRootPath = (string)AppDomain.CurrentDomain.GetData("WebRootPath");

This can be further exploited to create a static helper method that will allow us to have the same functionality as the good old Server.MapPath:

public static class MyServer 
{
    public static string MapPath(string path)
    {
        return Path.Combine(
            (string)AppDomain.CurrentDomain.GetData("ContentRootPath"), 
            path);
    }
}

Which can be used it in the following way:

var docPath = MyServer.MapPath("App_Data/docs");

For additional info regarding this approach and a bit of background, take a look at this post on my blog.

Answer 6

use for example: var fullPath = Path.Combine(Directory.GetCurrentDirectory(), "appsettings.json");