private static HttpClient Client = new HttpClient();

  //修改默认的生命周期
  services.AddHttpClient()
 .SetHandlerLifetime(TimeSpan.FromMinutes(5));

 //注册http请求服务
 services.AddHttpClient();

/// <summary>
    /// 注入http请求
    /// </summary>
    private readonly IHttpClientFactory httpClientFactory;
    public HttpHelp(IHttpClientFactory _httpClientFactory)
    {
      httpClientFactory = _httpClientFactory;
    }

    // <summary>
    // Get请求数据
    // <para>最终以url参数的方式提交</para>
    // </summary>
    // <param name="parameters">参数字典,可为空</param>
    // <param name="requestUri">例如/api/Files/UploadFile</param>
    // <returns></returns>
    public async Task<string> Get(Dictionary<string, string> parameters, string requestUri, string token)
    {
      //从工厂获取请求对象
      var client = httpClientFactory.CreateClient();
      //添加请求头
      if (!string.IsNullOrWhiteSpace(token))
      {
        client.DefaultRequestHeaders.Add("Authorization", "Bearer " + token);
      }
      client.DefaultRequestHeaders.Add("Content-Type", "application/json; charset=utf-8");
      //拼接地址
      if (parameters != null)
      {
        var strParam = string.Join("&", parameters.Select(o => o.Key + "=" + o.Value));
        requestUri = string.Concat(requestUri, '"color: #ff0000">二、使用命名客户端

1.在Startup.cs中进行注册， 这个注册可以存在多个 。以创建名字区分


services.AddHttpClient("github", c =>
{
  c.BaseAddress = new Uri("https://xxxxxxx.com/");
  // Github API versioning
  c.DefaultRequestHeaders.Add("Content-Type", "application/json; charset=utf-8");
  // Github requires a user-agent
  c.DefaultRequestHeaders.Add("Authorization", "asfasfasdsgdsfsdfsdafasfas");
});



2.使用方式和上面的一样只要


/// <summary>
    /// 注入http请求
    /// </summary>
    private readonly IHttpClientFactory httpClientFactory;
    public HttpHelp(IHttpClientFactory _httpClientFactory)
    {
      httpClientFactory = _httpClientFactory;
    }

    // <summary>
    // Get请求数据
    // <para>最终以url参数的方式提交</para>
    // </summary>
    // <param name="parameters">参数字典,可为空</param>
    // <param name="requestUri">例如/api/Files/UploadFile</param>
    // <returns></returns>
    public async Task<string> Get(Dictionary<string, string> parameters, string requestUri, string token)
    {
      //从工厂获取请求对象  声明自己创建哪一个httpClient客户端
      var client = httpClientFactory.CreateClient("github");
      //添加请求头
      if (!string.IsNullOrWhiteSpace(token))
      {
        client.DefaultRequestHeaders.Add("Authorization", "Bearer " + token);
      }
      client.DefaultRequestHeaders.Add("Content-Type", "application/json; charset=utf-8");
      //拼接地址
      if (parameters != null)
      {
        var strParam = string.Join("&", parameters.Select(o => o.Key + "=" + o.Value));
        requestUri = string.Concat(requestUri, '"color: #ff0000">三、类型化客户端

1.创建一个类


public class HttpClienService
{
  public HttpClient Client { get; }
  public HttpClienService(HttpClient client)
  {
    client.BaseAddress = new Uri("https://xxxx.com/");
    // GitHub API versioning
    client.DefaultRequestHeaders.Add("Authorization",
      "xxxxxxxxxxxx");
    // GitHub requires a user-agent
    client.DefaultRequestHeaders.Add("Content-Type",
      "application/json; charset=utf-8");
    Client = client;
  }

  //这个下面就是编写自己方法，进行调用
}




2.在Startup.cs中进行注册， 这个注册可以存在多个。


services.AddHttpClient<classHttp>();
//注册之后，使用依赖注入的方式进行注入，进行使用。



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