Amazon s3 获取异常，如处理后使用的对象，上载到Amazon.S3时为空引用

我有一个代码，可以读取流中的文件并将其上传到AmazonS3。我在Monotouch上使用了Amazon.NETSDK，在Android上使用了Mono，这两个版本的内部版本是Amazon SDK AssemblyVersion（“1.5.2.1”） 这很好用

但有时在上载时会引发以下异常：

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 

Message=对象在被释放后被使用。；
StackTrace=at System.Net.WebConnection.BeginWrite（System.Net.HttpWebRequest请求，System.Byte[]缓冲区，Int32偏移量，Int32大小，System.AsyncCallback cb，System.Object状态）[0x00000]in:0
在System.Net.WebConnectionStream.BeginWrite（System.Byte[]缓冲区、Int32偏移量、Int32大小、System.AsyncCallback cb、System.Object状态）[0x00000]中：0
消息=对象引用未设置为对象的实例；
StackTrace=at System.ServiceModel.Dispatcher.BaseMessagesFormatter.DeserializeReply（System.ServiceModel.Channels.Message消息，System.Object[]参数）[0x00000]位于：0
在System.ServiceModel.MonoInternal.ClientRuntimeChannel.Request（System.ServiceModel.Description.OperationDescription od，System.Object[]参数）[0x00000]中：0
在System.ServiceModel.MonoInternal.ClientRuntimeChannel.DoProcess（System.Reflection.MethodBase方法，System.String操作名，System.Object[]参数）[0x00000]中：0
0中的System.ServiceModel.MonoInternal.ClientRuntimeChannel.Process（System.Reflection.MethodBase方法、System.String操作名、System.Object[]参数）[0x00000]处

我并没有在代码中的任何地方为上传的文件流设置file stream=null或dispose

发现类似的问题进行了解释

我得到异常的那一行，它试图将给定的流上传到s3

更详细的解释

还有一些堆栈跟踪：

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使用HighLevelAPI上传；消息=对象引用未设置为对象的实例；
StackTrace=at System.Xml.XmlInputStream.Initialize（System.IO.Stream-Stream）[0x00000]in:0
在：0中的System.Xml.XmlInputStream..ctor（System.IO.Stream Stream）[0x00000]处
0中的System.Xml.XmlStreamReader..ctor（System.IO.Stream输入）[0x00000]处
0中的System.Xml.XmlTextReader..ctor（System.IO.Stream输入）[0x00000]处
在Amazon.S3.AmazonS3Client.transform（System.String responseBody，System.String actionName，System.Type t）[0x00000]中：0
在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:0
在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]中：0
在Amazon.S3.AmazonS3Client.getResponseCallback[PutObjectResponse]（IAsyncResult结果）[0x00000]中：0

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使用HighLevelAPI上传；消息=错误：SendFailure（写入标题时出错）；
StackTrace=at System.Net.HttpWebRequest.EndGetRequestStream（IAsyncResult asyncResult）[0x00000]位于：0
位于：0中的System.Net.HttpWebRequest.GetRequestStream（）[0x00000]处
在：0中的Amazon.S3.AmazonS3Client.getRequestStreamCallback[PutObjectResponse]（IAsyncResult结果）[0x00000]处

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 

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