我正在将Windows 8.1应用程序移植到Windows 10 UWP,但调用PostAsync
现在会抛出异常。
这个确切的代码在定位8.1时效果很好,但是当我以Windows 10 UWP为目标时,它会引发以下异常:
This IRandomAccessStream does not support the GetInputStreamAt method because it requires cloning and this stream does not support cloning.
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()
答案 0 :(得分:2)
您是否尝试过使用Windows.Web.Http.HttpClient
?
// 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);
}
}
答案 1 :(得分:0)
这是一个错误。解决方法是使用Windows.Web
using Windows.Web.Http;
using Windows.Web.Http.Filters;
using Windows.Web.Http.Headers;
/// <summary>
/// Performs the post asynchronous.
/// </summary>
/// <typeparam name="T">The generic type parameter.</typeparam>
/// <param name="uri">The URI.</param>
/// <param name="objectToPost">The object to post.</param>
/// <returns>The response message.</returns>
private static async Task<HttpResponseMessage> PerformPostAsync<T>string uri, object objectToPost)
{
HttpResponseMessage response = null;
// Just add default filter (to enable enterprise authentication)
HttpBaseProtocolFilter filter = new HttpBaseProtocolFilter();
using (HttpClient client = HttpService.CreateHttpClient(filter))
{
// Now create the new request for the post
HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, new Uri(uri));
if (objectToPost != null)
{
// Frist get the bytes
byte[] bytes = UTF8Encoding.UTF8.GetBytes(JsonHelper.Serialize(objectToPost));
// Now create the HttpBufferContent from the bytes and set the request content
IHttpContent content = new HttpBufferContent(bytes.AsBuffer());
content.Headers.ContentType = HttpMediaTypeHeaderValue.Parse(HttpService.JsonMediaType);
request.Content = content;
}
// Now complete the request
response = await client.SendRequestAsync(request);
}
return response;
}
/// <summary>
/// Creates the HTTP client.
/// </summary>
/// <param name="filter">The filter.</param>
/// <returns>HTTP client.</returns>
private static HttpClient CreateHttpClient(HttpBaseProtocolFilter filter = null)
{
HttpClient client = new HttpClient(filter);
client.DefaultRequestHeaders.Accept.Add(new HttpMediaTypeWithQualityHeaderValue(HttpService.JsonMediaType));
return client;
}
}
答案 2 :(得分:0)
我们需要将PCL System.Net.Http库用于跨平台,因此我们无法将所有内容交换为使用特定于平台的库。我们最终为特定的问题案例使用了不同的HttpMessageHandler。该处理程序将实际调用委托给Windows.Web.Http库。
/// <summary>
/// A System.Net.Http message handler that delegates out to Windows.Web.Http.HttpClient.
/// </summary>
public class WindowsHttpMessageHandler : HttpMessageHandler
{
private const string UserAgentHeaderName = "User-Agent";
protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
{
Windows.Web.Http.HttpClient client = new Windows.Web.Http.HttpClient();
Windows.Web.Http.HttpRequestMessage webRequest = new Windows.Web.Http.HttpRequestMessage
{
Method = ConvertMethod(request.Method),
RequestUri = request.RequestUri,
Content = await ConvertRequestContentAsync(request.Content).ConfigureAwait(false),
};
CopyHeaders(request.Headers, webRequest.Headers);
Windows.Web.Http.HttpResponseMessage webResponse = await client.SendRequestAsync(webRequest)
.AsTask(cancellationToken)
.ConfigureAwait(false);
HttpResponseMessage response = new HttpResponseMessage
{
StatusCode = ConvertStatusCode(webResponse.StatusCode),
ReasonPhrase = webResponse.ReasonPhrase,
Content = await ConvertResponseContentAsync(webResponse.Content).ConfigureAwait(false),
RequestMessage = request,
};
CopyHeaders(webResponse.Headers, response.Headers);
return response;
}
private static void CopyHeaders(HttpRequestHeaders input, Windows.Web.Http.Headers.HttpRequestHeaderCollection output)
{
foreach (var header in input)
{
output.Add(header.Key, GetHeaderValue(header.Key, header.Value));
}
}
private static void CopyHeaders(HttpContentHeaders input, Windows.Web.Http.Headers.HttpContentHeaderCollection output)
{
foreach (var header in input)
{
output.Add(header.Key, GetHeaderValue(header.Key, header.Value));
}
}
private static void CopyHeaders(Windows.Web.Http.Headers.HttpContentHeaderCollection input, HttpContentHeaders output)
{
foreach (var header in input)
{
if (!string.Equals(header.Key, "Expires", StringComparison.OrdinalIgnoreCase) || header.Value != "-1")
{
output.Add(header.Key, header.Value);
}
}
}
private static void CopyHeaders(Windows.Web.Http.Headers.HttpResponseHeaderCollection input, HttpResponseHeaders output)
{
foreach (var header in input)
{
output.Add(header.Key, header.Value);
}
}
private static string GetHeaderValue(string name, IEnumerable<string> value)
{
return string.Join(string.Equals(name, UserAgentHeaderName, StringComparison.OrdinalIgnoreCase) ? " " : ",", value);
}
private static Windows.Web.Http.HttpMethod ConvertMethod(HttpMethod method)
{
return new Windows.Web.Http.HttpMethod(method.ToString());
}
private static async Task<Windows.Web.Http.IHttpContent> ConvertRequestContentAsync(HttpContent content)
{
if (content == null)
{
return null;
}
Stream contentStream = await content.ReadAsStreamAsync().ConfigureAwait(false);
var result = new Windows.Web.Http.HttpStreamContent(contentStream.AsInputStream());
CopyHeaders(content.Headers, result.Headers);
return result;
}
private static async Task<HttpContent> ConvertResponseContentAsync(Windows.Web.Http.IHttpContent content)
{
var responseStream = await content.ReadAsInputStreamAsync();
var result = new StreamContent(responseStream.AsStreamForRead());
CopyHeaders(content.Headers, result.Headers);
return result;
}
private static HttpStatusCode ConvertStatusCode(Windows.Web.Http.HttpStatusCode statusCode)
{
return (HttpStatusCode)(int)statusCode;
}
}
虽然我们只需要拨打几个电话,但并未对所有用例进行100%测试。