services里添加如下

public void ConfigureServices(IServiceCollection services){services.AddControllers();services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_3_0);//services.AddSignalR();//services.AddDbContext<PostgreSqlDB>();services.AddHttpClient();}

controller里注入IHttpClientFactory

using Microsoft.AspNetCore.Mvc; using Microsoft.AspNetCore.SignalR; using SignalRAPI.Hubs; using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Net.Http; using System.Threading.Tasks;// For more information on enabling Web API for empty projects, visit https://go.microsoft.com/fwlink/?LinkID=397860namespace SignalRAPI.Controllers {[Route("api/[controller]/[action]")][ApiController]public class DownLoadController : ControllerBase{private IHttpClientFactory _httpClientFactory;public DownLoadController(IHubContext<ChatHub> HubContext,IHttpClientFactory httpClientFactory){_httpClientFactory = httpClientFactory;}[HttpPost]public async void DownLoadFromUrl([FromQuery] string url,string name){if (!System.IO.File.Exists(System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory, name))){var client = _httpClientFactory.CreateClient();byte[] fileBytes = await client.GetByteArrayAsync(url);System.IO.File.WriteAllBytes(System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory, name), fileBytes);_HubContext.Clients.All.SendAsync("download", name);}_HubContext.Clients.All.SendAsync("download", name);}// POST api/<DownLoadController>[HttpPost]public void Post([FromBody] string value){}} }

總結

以上是生活随笔為你收集整理的.net core 中使用httpclient下载文件的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。