dotnet (.Net) Core在不是Web 项目中使用HttpClientFactory正确用法

在不是web 项目中也不是Api 中使用 HttpClientFactory

先需要添加

Microsoft.Extensions.DependencyInjection.Abstractions

Microsoft.Extensions.Http

 static readonly IServiceCollection _services = new ServiceCollection();

  public static void AddServerHttpClient() 
        {
            _services.AddHttpClient();
        }

   public static HttpClient GetServerHttpClient() 
        {
            IHttpClientFactory httpClientFactory=     _services.BuildServiceProvider().GetService();
            return httpClientFactory.CreateClient();
        }