WebException
   在 System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
   在 DynamicClass.WebDAVClient.FinishUpload(IAsyncResult result)
   在 System.Net.LazyAsyncResult.Complete(IntPtr userToken)
   在 System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   在 System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   在 System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   在 System.Net.ContextAwareResult.Complete(IntPtr userToken)
   在 System.Net.LazyAsyncResult.ProtectedInvokeCallback(Object result, IntPtr userToken)
   在 System.Net.HttpWebRequest.SetResponse(Exception E)
   在 System.Net.ConnectionReturnResult.SetResponses(ConnectionReturnResult returnResult)
   在 System.Net.Connection.ReadComplete(Int32 bytesRead, WebExceptionStatus errorStatus)
   在 System.Net.LazyAsyncResult.Complete(IntPtr userToken)
   在 System.Net.LazyAsyncResult.ProtectedInvokeCallback(Object result, IntPtr userToken)
   在 System.Net.AsyncProtocolRequest.CompleteWithError(Exception e)
   在 System.Net.FixedSizeReader.ReadCallback(IAsyncResult transportResult)
   在 System.Net.LazyAsyncResult.Complete(IntPtr userToken)
   在 System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   在 System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   在 System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   在 System.Net.ContextAwareResult.Complete(IntPtr userToken)
   在 System.Net.LazyAsyncResult.ProtectedInvokeCallback(Object result, IntPtr userToken)
   在 System.Net.Sockets.BaseOverlappedAsyncResult.CompletionPortCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* nativeOverlapped)
   在 System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP)

IOException
无法从传输连接中读取数据: 远程主机强迫关闭了一个现有的连接。。
   在 System.Net.Security._SslStream.EndRead(IAsyncResult asyncResult)
   在 System.Net.TlsStream.EndRead(IAsyncResult asyncResult)
   在 System.Net.Connection.ReadCallback(IAsyncResult asyncResult)

SocketException
远程主机强迫关闭了一个现有的连接。
   在 System.Net.Sockets.Socket.EndReceive(IAsyncResult asyncResult)
   在 System.Net.Sockets.NetworkStream.EndRead(IAsyncResult asyncResult)