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POMemorystream and Large Object Heap
 

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    <p>I have to transfer large files between computers on via unreliable connections using WCF. </p> <p>Because I want to be able to resume the file and I don't want to be limited in my filesize by WCF, I am chunking the files into 1MB pieces. These "chunk" are transported as stream. Which works quite nice, so far.</p> <p>My steps are:</p> <ol> <li>open filestream</li> <li>read chunk from file into byte[] and create memorystream </li> <li>transfer chunk</li> <li>back to 2. until the whole file is sent</li> </ol> <p>My problem is in step 2. I assume that when I create a memory stream from a byte array, it will end up on the LOH and ultimately cause an outofmemory exception. I could not actually create this error, maybe I am wrong in my assumption.</p> <p>Now, I don't want to send the byte[] in the message, as WCF will tell me the array size is too big. I can change the max allowed array size and/or the size of my chunk, but I hope there is another solution.</p> <p><strong>My actual question(s):</strong></p> <ul> <li>Will my current solution create objects on the LOH and will that cause me problem? </li> <li>Is there a better way to solve this?</li> </ul> <p>Btw.: On the receiving side I simple read smaller chunks from the arriving stream and write them directly into the file, so no large byte arrays involved.</p> <p>Edit:</p> <p>current solution:</p> <pre><code>for (int i = resumeChunk; i &lt; chunks; i++) { byte[] buffer = new byte[chunkSize]; fileStream.Position = i * chunkSize; int actualLength = fileStream.Read(buffer, 0, (int)chunkSize); Array.Resize(ref buffer, actualLength); using (MemoryStream stream = new MemoryStream(buffer)) { UploadFile(stream); } } </code></pre>
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