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Silverlight 5中postAsync上的可移植Microsoft.Net.Http对象引用错误

[英]Portable Microsoft.Net.Http object reference error on postAsync in Silverlight 5

代码很简单:

var http = new HttpClient();
var uri = new Uri(Application.Current.Host.Source, "/api/query");
var postContext = new StringContent("test");
var response = await http.PostAsync(uri, postContext);

错误是:对象空引用

at System.Net.Http.DelegatingStream.get_CanSeek()
at System.Net.Http.StreamContent..ctor(Stream content, Int32 bufferSize)
at System.Net.Http.StreamContent..ctor(Stream content)
at System.Net.Http.HttpClientHandler.CreateResponseMessage(HttpWebResponse webResponse, HttpRequestMessage request)
at System.Net.Http.HttpClientHandler.TryGetExceptionResponse(WebException webException, HttpRequestMessage requestMessage, HttpResponseMessage& httpResponseMessage)
at System.Net.Http.HttpClientHandler.HandleAsyncException(RequestState state, Exception e)
at System.Net.Http.HttpClientHandler.GetResponseCallback(IAsyncResult ar)
at System.Net.Browser.BrowserHttpWebRequest.<>c__DisplayClass19.<InvokeGetResponseCallback>b__17(Object state2)
at System.Threading.QueueUserWorkItemCallback.WaitCallback_Context(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
at System.Threading.ThreadPoolWorkQueue.Dispatch()
at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback()

GetAsync效果很好。 但是PostAsync崩溃了。

请求失败(请注意堆栈中的HandleAsyncException)时,这是HttpWebRequest的Silverlight浏览器实现中的错误。 我们已经在较新版本的Microsoft.Net.Http中提供了解决方法,该版本应该很快就会发布。

现在,您可以尝试在SL中使用不返回空流的客户端堆栈。 http://msdn.microsoft.com/zh-CN/library/dd920295(v=VS.95).aspx

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