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

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; }
  }
}

.Net 5 ,.net core 3

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 last Part and register it's 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; //diference 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.