Microsoft 在.Net Framework 4.5中引入了HttpClient，并且是在.NET服务器端代码中使用Web API的最常用方法。但它有一些严重的问题，如释放HttpClient对象不立即关闭套接字，太多实例影响性能和单个的HttpClient或共享HttpClient实例不尊重DNS生存时间（TTL）设置。当并没有大批量或者并发调用时，选择 HttpClient 还行：

 private static readonly HttpClient HttpClient = new HttpClient();//定义




 var res = HttpClient.GetStringAsync(url).Result;//调用

　.net core 2.1 引入了HttpClientFactory的一些问题，当高并发时可以使用HttpClientFactory，例子链接里有，我只介绍一个在类库中使用方法：

1.类库中建封装类：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Threading.Tasks;

namespace Oss.Utils
{
    public class HttpClientFactory
    {
        public HttpClient Client { get; private set; }

        public HttpClientFactory(HttpClient httpClient)
        {
            httpClient.BaseAddress = new Uri("https://api.github.com/");
            httpClient.DefaultRequestHeaders.Add("Accept", "application/vnd.github.v3+json");
            httpClient.DefaultRequestHeaders.Add("User-Agent", "HttpClientFactory-Sample");
            Client = httpClient;
        }
    }
}

2.其他类中调用就好了:

  private static readonly HttpClient HttpClient = new HttpClient();
  private static readonly HttpClientFactory HttpClientFactory = new HttpClientFactory(HttpClient);
...
...
...


var res = HttpClientFactory.Client.GetStringAsync(url).Result;

okay，调用完成。

说明一下:在.net core 项目中使用HttpClientFactory的时候，要是在Startup.cs注册时，要安装:

Microsoft.Extensions.Http nuget包，

直接搜索即可。

具体使用方法和参考链接如下:https://www.cjavapy.com/article/150/

.net core 中使用httpclient,HttpClientFactory的问题

Microsoft.Extensions.Http nuget包，

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