C# HttpClient 流式响应

有些时候需要边请求边显示响应内容：

用httpClient.SendAsync(httpreq, HttpCompletionOption.ResponseHeadersRead);

 

?

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private async void TestHttp()        {              DateTime d = DateTime.Now;            HttpClient httpClient = new HttpClient();            httpClient.DefaultRequestHeaders.Add("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36 Edg/114.0.1823.58");            httpClient.DefaultRequestHeaders.Add("Origin", "https://xxxx.com");            httpClient.DefaultRequestHeaders.Add("Referer", "https://xxxxx.com/");            StringContent jsonContent = new StringContent(                JsonConvert.SerializeObject(new                {                    data= "你们的发货地是哪里？",                    userId = "1211334",                    title = "test",                    usesyy = false                }),             Encoding.UTF8,             "application/json");            var httpreq = new HttpRequestMessage(HttpMethod.Post, "https://xxxxxx") { Content = jsonContent };            var response = await httpClient.SendAsync(httpreq, HttpCompletionOption.ResponseHeadersRead);            //var response = await httpClient.PostAsync("https://api.xxxxx", jsonContent);              // 确保请求成功            //response.EnsureSuccessStatusCode();            string allStr = "";            // 读取响应内容的异步流            using (var responseStream = await response.Content.ReadAsStreamAsync())            {                Debug.Print("============start response use minseconds=" + (DateTime.Now - d).TotalMilliseconds + "  =================\r\n");                // 逐块读取并处理响应内容                var buffer = new byte[102];                int bytesRead;                while ((bytesRead = await responseStream.ReadAsync(buffer, 0, buffer.Length)) > 0)                {                    // 处理响应内容                    string content = System.Text.Encoding.UTF8.GetString(buffer, 0, bytesRead);                    allStr += content;                    Debug.Print("---------------" + content + "\r\n");                }            }            var useTime = (DateTime.Now - d).TotalMilliseconds;            var t2 = (DateTime.Now - DateTime.Now.AddMilliseconds(-100)).TotalMilliseconds;            TestHttp();        }