如何修复System.web中未包含的System.Web.Hosting

Question

我正在尝试从服务器获取图像并使用.net核心API在我的手机中显示。 并且我使用System.Web.Hosting.HostingEnvironment.MapPath（path）映射来自服务器的路径，但它抛出一个错误System.Web.Hosting，未包含在System.Web中，如何解决此问题？ 请帮助我。

我尝试添加System.Web，将目标框架从.net core 2.0.0扩展到.net core 2.2.0

using System.Threading.Tasks;
using BRT.API.Helpers;
using BRT.BLL.Model;
using BRT.BLL.Services;
using BRT.BLL.Services.Interfaces;
using BRT.DAL.Models;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
//using System.Web.Hosting;
using System.Net;
using System.Net.Http;
 [AllowAnonymous]
        [HttpGet]
        [Route ("ReadConfirmationPhoto/{productSN}")]
        public async Task<HttpResponseMessage> ReadConfirmationPhoto (string productSN) {
            var result = await _service.ReadPhysicalFile (productSN);
             HttpRequestMessage request = new HttpRequestMessage();
             var response = request.CreateResponse(HttpStatusCode.OK);
             var path = result.FileName;
            path = System.Web.Hosting.HostingEnvironment.MapPath(path);
            var ext = System.IO.Path.GetExtension(path);
            var contents = System.IO.File.ReadAllBytes(path);
            System.IO.MemoryStream ms = new System.IO.MemoryStream(contents);
            response.Content = new StreamContent(ms);
            response.Content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue(ext);
            return response;
}

Answer 1

您需要使用HostingEnvironment类代替Hosting。

您可以参考该帖子： 无法添加对System.Web.Hosting的引用