WorkflowElement和WorkflowXamlServices类不再存在.我正在尝试做这样的事情(在Beta 1中有效)：
WorkflowElement wf = WorkflowXamlServices.Load(File.OpenRead("Workflow.xaml")) as WorkflowElement;
WorkflowElement和WorkflowXamlServices类已从Beta2中删除.上述方法需要使用DynamicActivity和ActivityXamlServices.
DynamicActivity wf = ActivityXamlServices.Load("Workflow.xaml") as DynamicActivity;
