C# (Net6) HttpClient 帮助类

 public static string PostFromQueryToString(string url, string reqData)
        {

            string strUrl = new UriBuilder(url)
            {
                Query = reqData
            }.ToString();
            if (strUrl.StartsWith("https")) { System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls; }

            using (HttpClient httpClient = new HttpClient())
            {
                try
                {

                    using (HttpResponseMessage response = httpClient.SendAsync(new HttpRequestMessage(HttpMethod.Post, strUrl)).Result)
                    {
                        string resultStr = string.Empty;
                        if (response.IsSuccessStatusCode)
                        {
                            Task<string> t = response.Content.ReadAsStringAsync();
                            resultStr = t.Result;
                        }
                        response.Dispose();
                        return resultStr;
                    }
                }
                catch (System.AggregateException ex)
                {
                    return ex.Message;
                }
                finally
                {
                    httpClient.Dispose();
                }

            }
        }

        public static string PostFromBodyToString(string strUrl, string reqData)
        {
            try
            {

                if (strUrl.StartsWith("https"))
                {
                    System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;
                }
                string result = string.Empty;
                using (HttpContent httpContent = new StringContent(System.Text.Json.JsonSerializer.Serialize(reqData), System.Text.Encoding.UTF8, "application/json"))
                {
                    using (HttpClient httpClient = new HttpClient())
                    {
                        try
                        {
                            using (HttpResponseMessage httpRes = httpClient.PostAsync(strUrl, httpContent).Result)
                            {
                                if (httpRes.IsSuccessStatusCode)
                                {
                                    result = httpRes.Content.ReadAsStringAsync().Result;
                                }
                                httpRes.Dispose();
                            }

                        }
                        catch (Exception ex)
                        {
                            throw ex;
                        }
                        finally
                        {
                            httpClient.Dispose();
                            httpContent.Dispose();
                        }

                    }
                }
                return result;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        public static string PostFromFormToString(string url, Dictionary<string, string> reqData)
        {
            try
            {
                string result = string.Empty;
                using (HttpContent httpContent = new FormUrlEncodedContent(reqData))
                {
                    using (HttpClient httpClient = new HttpClient())
                    {
                        try
                        {
                            using (HttpResponseMessage httpRes = httpClient.PostAsync(url, httpContent).Result)
                            {
                                if (httpRes.IsSuccessStatusCode)
                                {
                                    result = httpRes.Content.ReadAsStringAsync().Result;
                                }
                                httpRes.Dispose();
                            }
                        }
                        catch (Exception ex)
                        {
                            throw ex;
                        }
                        finally
                        {
                            httpClient.Dispose();
                            httpContent.Dispose();
                        }
                    }
                }
                return result;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }