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我有一个代码可以读取流中的文件并将其上传到亚马逊 S3。我在内部使用了适用于 Monotouch 的 Amazon .net SDK 和适用于 Android 的 Mono，其中 Amazon SDK AssemblyVersion("1.5.2.1") 工作正常。

但有时上传时会抛出以下异常：

Message = The object was used after being disposed.; 
StackTrace =   at System.Net.WebConnection.BeginWrite (System.Net.HttpWebRequest request, System.Byte[] buffer, Int32 offset, Int32 size, System.AsyncCallback cb, System.Object state) [0x00000] in <filename unknown>:0 
at System.Net.WebConnectionStream.BeginWrite (System.Byte[] buffer, Int32 offset, Int32 size, System.AsyncCallback cb, System.Object state) [0x00000] in <filename unknown>:0 

Message = Object reference not set to an instance of an object; 
StackTrace =   at System.ServiceModel.Dispatcher.BaseMessagesFormatter.DeserializeReply (System.ServiceModel.Channels.Message message, System.Object[] parameters) [0x00000] in <filename unknown>:0 
at System.ServiceModel.MonoInternal.ClientRuntimeChannel.Request (System.ServiceModel.Description.OperationDescription od, System.Object[] parameters) [0x00000] in <filename unknown>:0 
at System.ServiceModel.MonoInternal.ClientRuntimeChannel.DoProcess (System.Reflection.MethodBase method, System.String operationName, System.Object[] parameters) [0x00000] in <filename unknown>:0 
at System.ServiceModel.MonoInternal.ClientRuntimeChannel.Process (System.Reflection.MethodBase method, System.String operationName, System.Object[] parameters) [0x00000] in <filename unknown>:0

我没有设置 file stream = null 或处理在代码中的任何位置上传的文件流。

发现类似的问题解释here

我得到异常的那一行，它尝试将给定的流上传到 s3。

更详细的解释http://forums.xamarin.com/discussion/27098/getting-exceptions-like-object-used-after-being-disposed-nullreference-while-upload-to-amazon-s3

更多堆栈跟踪：

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UploadUsingHighLevelAPI; Message = Object reference not set to an instance of an object; 
StackTrace =   at System.Xml.XmlInputStream.Initialize (System.IO.Stream stream) [0x00000] in <filename unknown>:0 
  at System.Xml.XmlInputStream..ctor (System.IO.Stream stream) [0x00000] in <filename unknown>:0 
  at System.Xml.XmlStreamReader..ctor (System.IO.Stream input) [0x00000] in <filename unknown>:0 
  at System.Xml.XmlTextReader..ctor (System.IO.Stream input) [0x00000] in <filename unknown>:0 
  at Amazon.S3.AmazonS3Client.transform (System.String responseBody, System.String actionName, System.Type t) [0x00000] in <filename unknown>:0 
  at Amazon.S3.AmazonS3Client.processRequestError (System.String actionName, System.Net.HttpWebRequest request, System.Net.WebException we, System.Net.HttpWebResponse errorResponse, System.String requestAddr, System.Net.WebHeaderCollection& respHdrs, System.Type t, System.Exception& cause) [0x00000] in <filename unknown>:0 
  at Amazon.S3.AmazonS3Client.handleHttpWebErrorResponse (Amazon.S3.Model.S3Request userRequest, System.Net.WebException we, System.Net.HttpWebRequest request, System.Net.HttpWebResponse httpResponse, System.Exception& cause, System.Net.HttpStatusCode& statusCode) [0x00000] in <filename unknown>:0 
  at Amazon.S3.AmazonS3Client.getResponseCallback[PutObjectResponse] (IAsyncResult result) [0x00000] in <filename unknown>:0

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UploadUsingHighLevelAPI; Message = Error: SendFailure (Error writing headers); 
StackTrace =   at System.Net.HttpWebRequest.EndGetRequestStream (IAsyncResult asyncResult) [0x00000] in <filename unknown>:0 
      at System.Net.HttpWebRequest.GetRequestStream () [0x00000] in <filename unknown>:0 
      at Amazon.S3.AmazonS3Client.getRequestStreamCallback[PutObjectResponse] (IAsyncResult result) [0x00000] in <filename unknown>:0
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