Httpclient()发送异步POST请求时的异常问题

2017-02-20 04:33:57 1.6k 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

.NET(C#)后台发送Get和Post请求的几种方法总结 NET (C#) 中，发送 HTTP GET 和 POST 请求可以通过多种方式实现，主要依赖于 .NET Framework 或 .NET Core/5+ 的版本。.NET中提供了多种方法来发送HTTP请求，每种方法都有其优缺点。选择哪种方法取决于具体需求和环境。阅读详情

使用Httpclient（）发送POST 请求以获得Token，部分程序如下：

    

 public async Task<string> GetAccessTokenAsync()

        {

            if (SubscriptionKey == string.Empty) return string.Empty;



            // Re-use the cached token if there is one.

            if ((DateTime.Now - storedTokenTime) < TokenCacheDuration)

            {

                return storedTokenValue;

            }



            using (var client = new HttpClient())

            using (var request = new HttpRequestMessage())

            {

                request.Method = HttpMethod.Post;

                request.RequestUri = ServiceUrl;

                request.Content = new StringContent(string.Empty);

                request.Headers.TryAddWithoutValidation(OcpApimSubscriptionKeyHeader, this.SubscriptionKey);

                client.Timeout = TimeSpan.FromSeconds(2);

       

                var response = await client.SendAsync(request);

                this.RequestStatusCode = response.StatusCode;

                response.EnsureSuccessStatusCode();

                var token = await response.Content.ReadAsStringAsync();

                storedTokenTime = DateTime.Now;

                storedTokenValue = "Bearer " + token;

                return storedTokenValue;

            }

        }