以 Windows 10 UWP 为目标时，PostAsync 抛出 IRandomAccessStream 错误 [英] PostAsync throwing IRandomAccessStream error when targeting windows 10 UWP

问题描述

我正在将我的 Windows 8.1 应用程序移植到 Windows 10 UWP，但现在调用 PostAsync 会引发异常.

I'm in the process of porting my windows 8.1 app to windows 10 UWP, but calling PostAsync now throws an exception.

这个确切的代码在面向 8.1 时完美运行，但是当我面向 Windows 10 UWP 时，它会引发以下异常:

This exact code works perfectly when targeting 8.1, but when I target Windows 10 UWP, it throws the following exception:

此 IRandomAccessStream 不支持 GetInputStreamAt 方法，因为它需要克隆，而此流不支持克隆.

代码

    public async void TestPost()
    {
        var parameters = GetParameters();
        var formattedData = new FormUrlEncodedContent(parameters);
        using (var clientHandler = new HttpClientHandler { Credentials = GetCredentials() })
        {
            using (var httpClient = new HttpClient(clientHandler))
            {
                var response = await httpClient.PostAsync(postUrl, formattedData);
            }
        }
    }

private Dictionary<string, string> GetParameters()
{
    var parameters = new Dictionary<string, string>();
    parameters["grant_type"] = "url";
    parameters["device_id"] = "unique key";
    parameters["redirect_uri"] = "redirect url";
    return parameters;
}

public static NetworkCredential GetCredentials()
{
    return new NetworkCredential("<secret key>", "");
}

堆栈跟踪

 at System.IO.NetFxToWinRtStreamAdapter.ThrowCloningNotSuported(String methodName)
   at System.IO.NetFxToWinRtStreamAdapter.GetInputStreamAt(UInt64 position)
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Net.Http.HttpHandlerToFilter.<SendAsync>d__1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Net.Http.HttpClientHandler.<SendAsync>d__1.MoveNext()

推荐答案

您是否尝试过使用 Windows.Web.Http.HttpClient 代替?

Have you tried using Windows.Web.Http.HttpClient instead?

// using Windows.Web.Http;
// using Windows.Web.Http.Filters;

var parameters = GetParameters();
var formattedData = new HttpFormUrlEncodedContent(parameters);
using (var clientHandler = new HttpBaseProtocolFilter())
{
    clientHandler.ServerCredential = GetCredentials();

    using (var httpClient = new HttpClient(clientHandler))
    {
        var response = await httpClient.PostAsync(postUrl, formattedData);
    }
}

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