How Do I Load A Class Into A Type? "Cannot cast object of type 'x' to 'x'"

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C#

reflection

Hi,

So, my code has been working ok. I have a state-safe workflow, which means that if the workflow engine stops and unloads, then it should be able to start back where I left it.

There are some stages that perform some setup (such as subscribing to events for eg) which I need to make sure is done if the workflow is loaded in a later stage.

For example:

Tracker Workflow Starts:
   state1: setup (subscribe to events)
   state2: wait for event (requires subscription to event)
   state3: report back to parent workflow

if the workflow is stopped (shutdown / crash) at stage 2, then I need to resubscribe to the event.

I added a method to the baseclass of the stages that runs only if the workflow is reloaded from a shutdown state. I can override it in state2 and resubscribe.

If I do not shut down the workflow, the following code runs fine:

public static IWorkflow LoadWorkflow(Workflow workflowInfo)
{
    Type type = LoadWorkflowType(workflowInfo);

    MethodInfo method = type.GetMethod("DeSerialize", Flags);
    if (method == null && type.BaseType != null)
        method = type.BaseType.GetMethod("DeSerialize", Flags | BindingFlags.InvokeMethod).MakeGenericMethod(type);

    if (method == null)
        throw new NullReferenceException("No DeSerialize method found!");

    IWorkflow workflow = (IWorkflow)method.Invoke(type, new object[] { workflowInfo });

    return workflow;
}

If I do restart it then I get an error at the invocation:

Quote:

Object of type 'WorkFlowEngine.Projections.Workflow' cannot be converted to type 'WorkFlowEngine.Projections.Workflow'.

I think that this is because one version of the assembly is loaded at runtime (Type type), whilst the other is a direct reference (the input parameter of "Deserialize").

i would like to convert the loaded version of type to the referenced version of 'WorkFlowEngine.Projections.Workflow'.

Is that even possible?
Is there a better way I can do this?


Thanks ^_^
Andy