Error when I load a workflow from the instance store. Type is not found

Question

I'm having problems when I try to load a workflow from the instance store. Its seems that it can't deserialize this workflow.

This is my code:

//Get workflow through WorkflowDefinitionManager
        Activity workflow = WorkflowDefinitionManager.GetWorkflow(wfDefinitionId);

        //Create wf application
        WorkflowApplication instance = new WorkflowApplication(workflow);
        instance.InstanceStore = InstanceStore;

        instance.Completed += WorkflowApplication_OnCompleted;
        instance.Aborted += WorkflowApplication_OnAborted;
        instance.Idle += WorkflowApplication_OnIdle;
        instance.OnUnhandledException += WorkflowApplication_OnUnhandledException;
        instance.PersistableIdle += WorkflowApplication_OnPersistableIdle;

        instance.Load(inGuid);  //<--- I get the error here

Error:

The deserializer cannot load the type to deserialize because type 'System.Activities.Variable`1+VariableLocation[[MYCLASS, MYASSEMBLY, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]]' could not be found in assembly 'System.Activities, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'. Check that the type being serialized has the same contract as the type being deserialized and the same assembly is used.

I don't understand why I get this error if I can start and persist the workflow before. Could you help me? Please

Thanks

Answer 1

Finally I solved my errors resolving the assemblies in runtime:

AppDomain appDomain = AppDomain.CurrentDomain;
appDomain.AssemblyResolve += AppDomain_AssemblyResolve;
instance.Load(inGuid);
appDomain.AssemblyResolve -= AppDomain_AssemblyResolve;

This is the callback:

private Assembly AppDomain_AssemblyResolve(object sender, ResolveEventArgs e)
    {

        try
        {
            string strTempAssmbPath = ExtensionsFolder + e.Name.Substring(0, e.Name.IndexOf(",")) + ".dll";
            return Assembly.LoadFile(strTempAssmbPath);
        }
        catch (Exception ex)
        {
            log.Error(ex);

        }
        return null;
    }