今天做WF 的.NET编程
一直弄了好久，对状态机方式今天终于有了一点小小的入门。还要感谢 曲滨 的程序

asp.net使用wwf
1，配置 web.config
    在 <configuration> 与<system.web>之间需要添加

<configSections>
    <section name="WorkflowRuntime" type="System.Workflow.Runtime.Configuration.WorkflowRuntimeSection, System.Workflow.Runtime, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
    <section name="ExternalDataExchangeService" type="System.Workflow.Activities.ExternalDataExchangeServiceSection, System.Workflow.Activities, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
  </configSections>
 <appSettings/>
 <connectionStrings/>

2，在网站运行的时候就加载wf服务，编写 global.asax

3.接口Interface的理解
以前一直都没怎么接触这个东东，现在觉得接口其实就是一个抽象类，由于知识有限，记住关于状态的Interface写法就好了

[ExternalDataExchange]//一定要写这个
 public interface IBillWorkFlow
 {
        event EventHandler<ExternalDataEventArgs> BillSubmit;//自定义状态转移事件
        event EventHandler<ExternalDataEventArgs> BillOk;
 }
//下面照着模式写，依葫芦画票
 [Serializable]
    public class MyBillWorkFlow : IBillWorkFlow {
        public MyBillWorkFlow() {
            System.Diagnostics.Debug.WriteLine("MyBillWorkFlow Init");
        }
        Dictionary<string, EventHandler<ExternalDataEventArgs>> _EventList = new Dictionary<string, EventHandler<ExternalDataEventArgs>>();

        public void RaisEvent(string strName,Guid guidInstanceId) {
            if (_EventList[strName] != null)
            {
                try
                {
                    EventHandler<ExternalDataEventArgs> evehandler = _EventList[strName];
                    ExternalDataEventArgs ede = new ExternalDataEventArgs(guidInstanceId);
                    evehandler(this, ede);
                }
                catch { 
                
                }
            }
        }

        public event EventHandler<ExternalDataEventArgs> BillSubmit {
            add {
                System.Diagnostics.Debug.WriteLine("add BillSubmit event");
                _EventList.Add("BillSubmit", value); 
            }
            remove { _EventList.Remove("BillSubmit"); }
        }

        public event EventHandler<ExternalDataEventArgs> BillOk {
            add { _EventList.Add("BillOk", value); }
            remove { _EventList.Remove("BillOk"); }
        }
    }

4.再来解释一下global.asax中的那几个东东
 

System.Workflow.Activities.ExternalDataExchangeService dataService = new System.Workflow.Activities.ExternalDataExchangeService();
 WorkflowRuntime.AddService(dataService);
 Billdayone.MyBillWorkFlow myBillWorkFlow = new Billdayone.MyBillWorkFlow();
 dataService.AddService(myBillWorkFlow);

//这几个东东是把自己定义的接口类加载到WorkflowRuntime的实例中去，很重要的。

5.接下来就是操作
a.创建一个工作流

System.Workflow.Runtime.WorkflowRuntime workflowruntime = Application["WorkflowRuntime"] as System.Workflow.Runtime.WorkflowRuntime;
System.Workflow.Runtime.WorkflowInstance workflowinstance =  workflowruntime.CreateWorkflow(typeof(Billdayone.BillWorkFlow));
workflowinstance.Start();

b.得到该WorkflowRuntime的所有正在执行的工作流

System.Workflow.Runtime.WorkflowRuntime workflowruntime = application["WorkflowRuntime"] as System.Workflow.Runtime.WorkflowRuntime;
System.Collections.ObjectModel.ReadOnlyCollection<System.Workflow.Runtime.WorkflowInstance> listWorkflowInstance = workflowruntime.GetLoadedWorkflows();
foreach (System.Workflow.Runtime.WorkflowInstance key in listWorkflowInstance) {
            System.Workflow.Activities.StateMachineWorkflowInstance stateWorkflow = new System.Workflow.Activities.StateMachineWorkflowInstance(workflowruntime, key.InstanceId);
            WorkFlowShow += key.InstanceId + " " + stateWorkflow.CurrentState.QualifiedName + " <input type=\"button\" name=\"button\" id=\"button\" value=\"next\" onclick=\"document.getElementById('TextBox2').value='"+key.InstanceId+"'\" />" + "</br>";
        }

c.执行一个工作流，转化其状态

Billdayone.MyBillWorkFlow mMyworkflow = (Application["WorkflowRuntime"] as System.Workflow.Runtime.WorkflowRuntime).GetService<Billdayone.MyBillWorkFlow>();

if (mMyworkflow != null)
        {
            System.Workflow.Activities.StateMachineWorkflowInstance stateWorkflow = new System.Workflow.Activities.StateMachineWorkflowInstance(Application["WorkflowRuntime"] as System.Workflow.Runtime.WorkflowRuntime, instanceId);
            if (stateWorkflow.CurrentStateName == "stateInit")
            {
                mMyworkflow.RaisEvent("BillSubmit", instanceId);
            }
            if (stateWorkflow.CurrentStateName == "stateFinance")
            {
                mMyworkflow.RaisEvent("BillOk", instanceId);
            }

        }
        else {
            System.Diagnostics.Debug.WriteLine("mMyworkflow not found");
        }

好了，只能做到这里，关于如何传参数以及把工作流从内存中保存下来要进一步学些。。。
downloadBilldayone.rar 开发环境 .net2005安装.net framework 3.0安装winfx安装Visual Studio 2005 extensions for .NET Framework 3.0 (Windows Workflow Foundation)
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