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Is this a good workflow system design?

I am developing a system that will allow me to present wide-scope tasks as workflows that expose their work items using the IEnumerable method. The goal is to use the C # 'yield' mechanism to allow me to write pseudo-process code that the workflow runtime system can execute as it sees fit.

For example, let's say I have a workflow that involves running a query in a database and sending an email alert if the query returns a specific result. This may be a workflow:

public override IEnumerable<WorkItem> Workflow() {
    // These would probably be injected from elsewhere
    var db = new DB();
    var emailServer = new EmailServer();

    // other workitems here

    var ci = new FindLowInventoryItems(db);
    yield return ci;

    if (ci.LowInventoryItems.Any()) {
        var email = new SendEmailToWarehouse("Inventory is low.", ci.LowInventoryItems);
        yield return email;
    }

    // other workitems here
}

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: Windows Workflow Foundation

MSDN: Workflow Foundation (WF)

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