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copied!<p>In the end I decompiled System.Activities.DurableInstancing. The only setter for WorkflowHostType on SqlWorkflowInstanceStore was in ExtractWorkflowHostType:</p> <pre><code>private void ExtractWorkflowHostType(IDictionary<XName, InstanceValue> commandMetadata) { InstanceValue instanceValue; if (commandMetadata.TryGetValue(WorkflowNamespace.WorkflowHostType, out instanceValue)) { XName xName = instanceValue.Value as XName; if (xName == null) { throw FxTrace.Exception.AsError(new InstancePersistenceCommandException(SR.InvalidMetadataValue(WorkflowNamespace.WorkflowHostType, typeof(XName).Name))); } byte[] bytes = Encoding.Unicode.GetBytes(xName.ToString()); base.Store.WorkflowHostType = new Guid(HashHelper.ComputeHash(bytes)); this.fireRunnableInstancesEvent = true; } } </code></pre> <p>I couldn't clearly disentangle the calling code path, so I had to find out at runtime by attaching WinDbg/SOS to IIS and breaking on HashHelper.ComputeHash. </p> <p>I was able to retreive the XName that goes into the hash calculation, which has a localname equal to the servicefile, and a namespace equal to the [sitename]/[path]/.</p> <p>In the end the WorkflowHostType calculation comes down to:</p> <pre><code>var xName = XName.Get("Flow.xamlx.svc", "/examplesite/WorkflowService/1/"); var bytes = Encoding.Unicode.GetBytes(xName.ToString()); var WorkflowHostType = new Guid(HashHelper.ComputeHash(bytes)); </code></pre> <p>Bottomline: apparently workflows can only be rehydrated when the service filename, sitename and path are all identical (case sensitive) as when they were started</p>

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