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POAre WCF data streaming restrictions enforced?
 

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    <p>We have been seeing random OutOfMemoryExceptions and InsufficientMemoryExceptions at customer sites. We use the GZipMessageEncoder to compress messages. (I am aware of the <a href="https://stackoverflow.com/questions/4631627/wcf-conditional-compression/7278500#7278500">IIS 7.x compression</a> option and <a href="https://stackoverflow.com/questions/4043683/wcf-httptransport-streamed-vs-buffered-transfermode">other problems with buffering and/or the GZipMessageEncoder</a>.)</p> <p>I wanted to try to enable WCF streaming. Our WCF services have contracts like the following:</p> <pre><code>[OperationContract] DataSet GetDataSet(Guid someGUID, string someName, DataSet parameters); </code></pre> <p>According to <a href="http://msdn.microsoft.com/en-us/library/ms731913.aspx" rel="nofollow noreferrer">this article on MSDN</a>:</p> <blockquote> <p>Operations that occur across a streamed transport can have a contract with at most one input or output parameter</p> </blockquote> <p>Obviously, our contract violates the WCF streaming restrictions. This contract has 3 input parameters.</p> <p>However, out of curiosity, I decied to try enabling streaming anyway. I edited the web.config file and MyCSharpClient.config file and inserted the following attribute into the transport section of the binding:</p> <pre><code>&lt;httpTransport ... transferMode="Streamed"&gt; </code></pre> <p>To my surprise, everything seems to work anyway! There are no exceptions thrown. I can break into the GZipMessageEncoder and verify that the stream methods are being called instead of the buffer methods.</p> <p>So, my question: why was I able to setup streaming transport on an operation context that violates the WCF restriction on input parameters? Given the strong wording of the MSDN streaming article, I assume this is just an implementation detail, and that I must not rely on this behavior.</p>
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    1. USPaul Williams
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    1. COi don't know the answer but please check if this is not a duplicate here: http://stackoverflow.com/questions/6094342/streamed-transfer-restrictions-with-wcf
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    2. CODifferent question. I understand how to bundle the parameters to meet the MSDN specification of 1 input parameter. I just want to know if the restrictions are actually enforced, and what kind of errors I would see if I did violate the WCF restriction.
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    3. COWhy risk it when it is easy enough to bundle the parameters?
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