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POWCF fails when returning data
 

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    <p>My first forays into WCF. The class <code>HardDrive</code> goes and collects a bunch of WMI information about locally connected drives. For some reason, when it attempts to return the <code>List&lt;HardDrive&gt;</code> to the client, I get </p> <blockquote> <p><em>The underlying connection was closed: The connection was closed unexpectedly.</em></p> </blockquote> <p>Which is one of those totally unhelpful error messages. </p> <p>I've done step-by-step debugging, so I <em>know</em> it's crashing when it tries to return the list back to the client. I just don't know <em>why</em>. </p> <p>My best guess is something to do with the size of the returned list, but...it's not going to be that big, I wouldn't think? </p> <p>I've tested this returning a basic string and it works fine. </p> <pre><code>namespace FCopyDataService { public class FCopyDataService : IFCopyDataService { public List&lt;HardDrive&gt; GetAllHardDrives() { return HardDrive.GetHardDrives(); //this returns quite happily } public List&lt;Partition&gt; GetAllPartitions(HardDrive currentDrive) { return HardDrive.GetPartitions(currentDrive); } } } </code></pre> <p>I call it from the client using: </p> <pre><code>private void button1_Click(object sender, EventArgs e) { FCopyDataServiceClient drives = new FCopyDataServiceClient(); drives.Open(); //checks it's open List&lt;HardDrive&gt; receivedDrives = drives.GetAllHardDrives(); //crashes here } </code></pre> <p>My service config:</p> <pre><code>&lt;?xml version="1.0"?&gt; &lt;configuration&gt; &lt;system.web&gt; &lt;compilation debug="true" targetFramework="4.0" /&gt; &lt;httpRuntime maxRequestLength="102400" /&gt; &lt;/system.web&gt; &lt;system.serviceModel&gt; &lt;behaviors&gt; &lt;serviceBehaviors&gt; &lt;behavior&gt; &lt;serviceMetadata httpGetEnabled="true"/&gt; &lt;serviceDebug includeExceptionDetailInFaults="true"/&gt; &lt;/behavior&gt; &lt;/serviceBehaviors&gt; &lt;/behaviors&gt; &lt;serviceHostingEnvironment multipleSiteBindingsEnabled="true" /&gt; &lt;/system.serviceModel&gt; &lt;system.webServer&gt; &lt;modules runAllManagedModulesForAllRequests="true"/&gt; &lt;/system.webServer&gt; &lt;/configuration&gt; </code></pre> <p>And my client config, with some odd bits because I've been trying to work this out. </p> <pre><code>&lt;system.serviceModel&gt; &lt;bindings&gt; &lt;basicHttpBinding&gt; &lt;binding name="BasicHttpBinding_IFCopyDataService" closeTimeout="00:01:00" openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00" allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard" maxBufferSize="65536" maxBufferPoolSize="524288" maxReceivedMessageSize="65536" messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered" useDefaultWebProxy="true"&gt; &lt;readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384" maxBytesPerRead="4096" maxNameTableCharCount="16384" /&gt; &lt;security mode="None"&gt; &lt;transport clientCredentialType="None" proxyCredentialType="None" realm="" /&gt; &lt;message clientCredentialType="UserName" algorithmSuite="Default" /&gt; &lt;/security&gt; &lt;/binding&gt; &lt;/basicHttpBinding&gt; &lt;/bindings&gt; &lt;client&gt; &lt;endpoint address="http://localhost:19140/FCopyDataService.svc" binding="basicHttpBinding" bindingConfiguration="BasicHttpBinding_IFCopyDataService" contract="FCopyDataService.IFCopyDataService" name="BasicHttpBinding_IFCopyDataService" /&gt; &lt;/client&gt; &lt;behaviors&gt; &lt;endpointBehaviors&gt; &lt;behavior&gt; &lt;dataContractSerializer maxItemsInObjectGraph="2147483647"/&gt; &lt;/behavior&gt; &lt;/endpointBehaviors&gt; &lt;serviceBehaviors&gt; &lt;behavior &gt; &lt;serviceDebug includeExceptionDetailInFaults="true" /&gt; &lt;serviceMetadata httpGetEnabled="true" /&gt; &lt;dataContractSerializer maxItemsInObjectGraph="2147483647" /&gt; &lt;/behavior&gt; &lt;/serviceBehaviors&gt; &lt;/behaviors&gt; &lt;/system.serviceModel&gt; </code></pre>
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    1. USDavid M
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    1. COIs the HardDrive class serializable?
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      1. USGrant H.
    2. COAlso worth noting that you do have fairly low limits on the size/length of the returned data. As you mention, depending on the amount of data, this may also be a cause.
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      1. USGrant H.
    3. COI would enable WCF trace logging, and see if you get any better error information in the trace log.
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      1. USCodingWithSpike
 

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