Question

我正面临着http呼叫的问题。

错误消息是：httpclient postasync an error occurred while sending the request

 public TResult PostAPI<T>(string url, T reqparams, List<KeyValuePair<string, string>> formParameters = null, string jsonString = "", List<KeyValuePair<string, string>> headers = null)
    {
        HttpContent contentPost = null;
        if (headers != null)
        {
            AddHeaders(headers);
        }
        if (formParameters != null)
        {
            var formContent = new FormUrlEncodedContent(formParameters);
            contentPost = formContent;

        }
        else if (!string.IsNullOrEmpty(jsonString))
        {
            var content = new StringContent(jsonString, Encoding.UTF8, "application/json");
            contentPost = content;
        }

        string s = JsonConvert.SerializeObject(reqparams);
        var contents = new StringContent(s, Encoding.UTF8, "application/json");
        contentPost = contents;

        //client. = 3000;
        var response = client.PostAsync(url, contentPost).Result; //Task.Run(() => client.PostAsync(url, contentPost)).Result;

        IEnumerable<string> responseHeaders;
        response.Headers.TryGetValues("Authorization", out responseHeaders);

        if (responseHeaders != null && responseHeaders.Any())
        {
            AccessToken = responseHeaders.Select(x => x).FirstOrDefault();
        }

        var apiResult = response.Content.ReadAsStringAsync().Result;
        var result = JsonConvert.DeserializeObject<TResult>(apiResult);
        return result;
    }

抛出此错误：

at System.Net.Http.HttpClientHandler + d__63.MoveNext（）[0x004ab] in＆lt; 7736395a6c71409691a34accfc621095＆gt ;:0 ---从抛出异常的先前位置开始的堆栈跟踪结束--- 在＆lt; 896ad1d315ca4ba7b117efb8dacaedcf＆gt;中的System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）[0x0000c]：0 在System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（System.Threading.Tasks.Task任务）[0x0003e]在＆LT; 896ad1d315ca4ba7b117efb8dacaedcf＆GT;：0在System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（System.Threading.Tasks.Task任务） [0x00028]在＆LT; 896ad1d315ca4ba7b117efb8dacaedcf＆GT;：0在System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd（System.Threading.Tasks.Task任务）[0x00008]在＆LT; 896ad1d315ca4ba7b117efb8dacaedcf＆GT;：0在System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1 + ConfiguredTaskAwaiter [TResult] .GetResult（）[0x00000] in＆lt; 896ad1d315ca4ba7b117efb8dacaedcf＆gt ;:0 在System.Net.Http.HttpClient + d__49.MoveNext（）[0x000ca] in＆lt; 7736395a6c71409691a34accfc621095＆gt ;:0

在Xamarin表单中面对HTTPClient post方法中的问题

0 个答案: