json - UWP Httpclient postasync 在后台任务中使用 json 字符串

Question

我只想从我的 UWP 应用程序中的后台任务将一些 json 发布到 api 并获取响应以将其读出。我的后台任务不断失败

Platform::DisconnectedException ^ at memory location 0x077FEE74.

我尝试了很多方法让它与互联网上的东西一起工作，但只是稍微调整了失败。没有代码我可以完美地执行后台任务。

这里的代码:

public async void Run(IBackgroundTaskInstance taskInstance)
        {
            _deferral = taskInstance.GetDeferral();

HttpClient aClient = new HttpClient();

            aClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
            aClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("text/javascript"));



        Uri theUri = new Uri("https://m.xxxx.com/api/v4/session?expand=account,profile)");

StringContent theContent = new StringContent("{ \"keep_login\": true, \"id\": null, \"username\": \"zumbauser\", \"password\": \"zumbapw\" }", Encoding.UTF8, "application/json");


        HttpResponseMessage aResponse = await aClient.PostAsync(theUri, theContent);

        if (aResponse.IsSuccessStatusCode)
        {
            Debug.WriteLine("This is outpuuuuuuuuuuuuuut: " + aResponse.ToString());
        }
        else
        {
            // show the response status code 
            String failureMsg = "HTTP Status: " + aResponse.StatusCode.ToString() + " – Reason: " + aResponse.ReasonPhrase;
        }

_deferral.Complete();
        }

我试图模仿的 Json 看起来像这样:

{"keep_login":null,"id":null,"username":"zumbauser","password":"zumbapw"}

任何帮助表示赞赏!

Answer 1

我知道这听起来可能很傻，但是这 HttpClient你正在用吗？来自 System.Net.Http或者来自 Windows.Web.Http 的那个?尝试切换到另一个，它可能会有所帮助