推荐订阅源

Windows Workflow Founcation有三个名称空间:
System.Workflow.Activities
System.Workflow.ComponentModel
System.Workflow.Runtime

System.Workflow.ComponentModel:
类(Classes)
1.DataExchangeServiceAttribute Class 用来定义与Workflow交换数据的接口.

System.Workflow.Runtime.Messaging
类(Classes)
1.WorkflowMessageEventArgs Class 流程消息事件，在流程消息事件时需要继承这个类.并且新的类需要加"[Serializable]"，需要序列化．
WorkflowMessageEventArgs的构造方法是多态的:

public WorkflowMessageEventArgs (
Guid instanceId,
Type workflowType,
IPendingWork workHandler,
Object workItem
)

public WorkflowMessageEventArgs (
Guid instanceId
)