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POArgumentOutOfRangeException when downloading file via Stream.Read
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  1. POArgumentOutOfRangeException when downloading file via Stream.Read
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    copied!<p>I've been struggling with a problem when downloading very big files (>2GB) on Silverlight. My application is an <em>out-of-browser</em> Download Manager running with elevated permissions.</p> <p>When the file reaches a certain ammount of data (2GB), it throws the following exception:</p> <pre><code>System.ArgumentOutOfRangeException was caught Message=Specified argument was out of the range of valid values. Parameter name: count StackTrace: in MS.Internal.InternalNetworkStream.BeginRead(Byte[] buffer, Int32 offset, Int32 count, AsyncCallback callback, Object state) in MS.Internal.InternalNetworkStream.Read(Byte[] buffer, Int32 offset, Int32 count) in MySolution.DM.Download.BeginResponseCallback(IAsyncResult ar) InnerException: Null </code></pre> <p>The only clue I have is <a href="http://reflector.webtropy.com/default.aspx/4@0/4@0/untmp/DEVDIV_TFS/Dev10/Releases/RTMRel/ndp/fx/src/Net/System/Net/Sockets/NetworkStream@cs/1305376/NetworkStream@cs" rel="nofollow">this site</a>, who shows the <code>BeginCode</code> implementation. This exception only occurs when <code>count</code> is &lt; then 0.</p> <p><strong>My code</strong></p> <pre><code>/* "Target" is a File object. "source" is a Stream object */ var buffer = new byte[64 * 1024]; int bytesRead; Target.Seek(0, SeekOrigin.End); // The file might exists when resuming a download /* The exception throws from inside "source.Read" */ while ((bytesRead = source.Read(buffer, 0, buffer.Length)) &gt; 0) { Target.Write(buffer, 0, bytesRead); _fileBytes = Target.Length; Deployment.Current.Dispatcher.BeginInvoke(() =&gt; { DownloadPercentual = Double.Parse(Math.Round((decimal)(_fileBytes / (_totalSize / 100)), 5).ToString()); }); } Target.Close(); logFile.Close(); </code></pre> <p>The error occurs with different kind of files, and they come from public buckets on Amazon S3. (with regular http requests).</p>
 

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