How to get a FileSystem path to save a file in ASPNET MVC

Question

I have a controller where I upload a file

Here is the controller

using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
using System.IO;
using System.Linq;
using System.Collections.Generic;
using System.Threading.Tasks;
using System;
using System.Web;

namespace TodoApi.Controllers {
    [Route("[controller]")]
    public class FileUploadController : Controller
    {

        public FileUploadController()
        {
        }

        [HttpPost]
        public IActionResult Index(List<IFormFile> files)
        {
            var filePath = Server.MapPath("/UploadedFiles/Foo");
            return Ok();
        }
    }
}

When I try to build it claims that there is no Server in context. I tried HttpContext.Current.Server System.Web.HttpContext.Current.Server but I always get no X in context. What I'm missing?

Here is csproj

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>netcoreapp3.1</TargetFramework>
  </PropertyGroup>


</Project>

Here is the current error

Microsoft (R) Build Engine version 16.5.0+d4cbfca49 for .NET Core
Copyright (C) Microsoft Corporation. All rights reserved.

  Restore completed in 61.19 ms for /Users/gecko/code/TodoApi2/TodoApi2.csproj.
Controllers/FileUploadController.cs(24,28): error CS0103: The name 'Server' does not exist in the current context [/Users/gecko/code/TodoApi2/TodoApi2.csproj]

Build FAILED.

Controllers/FileUploadController.cs(24,28): error CS0103: The name 'Server' does not exist in the current context [/Users/gecko/code/TodoApi2/TodoApi2.csproj]
    0 Warning(s)
    1 Error(s)

Time Elapsed 00:00:02.50

I uploaded the code to this repo https://github.com/dhilst/TodoApi2

according to your error The type or namespace name 'HttpContext' does not exist in the namespace 'System.Web' (are you missing an assembly reference?) the reference to System.Web was not added to the project. Note you can add an using statement and not get an error without adding the reference. — Lev, May 07 '20 at 21:43
Have you looked at https://stackoverflow.com/q/49398965/3773983 ? — Dave Barnett, May 10 '20 at 06:26
No but it does a lot of sense to me, I will try out! Thanks! — geckos, May 10 '20 at 12:25

score 0 · Answer 1 · answered May 07 '20 at 22:33

0

Avoid Server.MapPath in your API, use HostingEnvironment instead:

System.Web.Hosting.HostingEnvironment.MapPath("~/UploadedFiles/Foo");

answered May 07 '20 at 22:33

UnraisedCesar

68
3

Hi, thanks for the answer, I'm pretty new to aspnet, what is the difference? I got Server.MapPath from the documentation examples – geckos May 07 '20 at 23:57
1

I'm trying to find a link to the documentation, but what I recall is: Server.MapPath() uses internally HostingEnvironment.MapPath, however Server.MapPath requires the HttpContext before calling HostingEnvironment.MapPath() and HttpContext is available depending on how the service is hosted, in your case was not available. – UnraisedCesar May 09 '20 at 00:17
I tried system.web.hosting environment wihtou success too, I'm using .net core – geckos May 09 '20 at 16:40

How to get a FileSystem path to save a file in ASPNET MVC

1 Answers1