百度百科:
工作流(Workflow),就是“业务过程的部分或整体在计算机应用环境下的自动化”,它主要解决的是“使在多个参与者之间按照某种预定义的规则传递文档、信息或任务的过程自动进行,从而实现某个预期的业务目标,或者促使此目标的实现”。
一句话:工作流就是一系列相互衔接、自动进行的业务活动。
再通俗点就是对于一个业务需求不需要我们像以前一样手动去调用,而是使用工作流自动执行
1,不必手动去调各个方法,而由工作流控制程序的执行
2,状态的维护由工作流处理,减轻程序员工作量
3,更加面像对象(对于工作流的结点的抽象可以实现更好的复用)
1,开发结点
2,根据需求组织工作流
3,使用工作流
代码示例:
/// <summary> /// 启动工作流 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> protected void Start_Click(object sender, EventArgs e) { RequestInfo.RequestInfo info = new RequestInfo.RequestInfo(); info.InstanceID = Guid.Empty; info.RealName = txtRealName.Text; info.YourCompany = "hjy"; info.YourInterest = "hjy"; info.YourPost = "[email protected]"; info.Email = "hejingyuan"; WorkFlowProcess.CreateAndRun(info); lbMsg.Text = "申请成功,等待管理员审核..."; }
// creates a workflow application, binds parameters, links extensions and run it public static Guid CreateAndRun(RequestInfo.RequestInfo Request) { SqlWorkflowInstanceStore instanceStore = new SqlWorkflowInstanceStore("server=.;database=aspnetdb;uid=sa;pwd=123456"); InstanceView view = instanceStore.Execute(instanceStore.CreateInstanceHandle(), new CreateWorkflowOwnerCommand(), TimeSpan.FromSeconds(30)); instanceStore.DefaultInstanceOwner = view.InstanceOwner; IDictionary<string, object> input = new Dictionary<string, object> { { "Request" , Request } }; WorkflowApplication application = new WorkflowApplication(new ApplyBlogFlow(), input); application.InstanceStore = instanceStore; //获取或设置当前工作流实例处于空闲状态并可被保留时调用的 ActivityFunc application.PersistableIdle = (e) => { instanceUnloaded.Set(); return PersistableIdleAction.Unload; }; //获取或设置卸载当前工作流 application.Unloaded = (e) => { instanceUnloaded.Set(); }; //获取或设置当前工作流实例遇到未处理的异常时 application.OnUnhandledException = (ex) => { Console.Write("Exception"); return UnhandledExceptionAction.Terminate; }; Guid id = application.Id; application.Run(); //阻止当前线程,直到当前waithand收到信号 instanceUnloaded.WaitOne(); return id; }
/// <summary> /// 激活工作流(输入工作流id) /// </summary> /// <param name="sender"></param> /// <param name="e"></param> protected void Activite_Click(object sender, EventArgs e) { RequestInfo.RequestInfo info = new RequestInfo.RequestInfo(); info.InstanceID = Guid.Parse(lblQC.Text); info.RealName = txtRealName.Text; info.Email = "hejingyuan"; info.Agree = "true"; WorkFlowProcess.RunInstance(info); lbMsg.Text = "提交成功!"; }
public static void RunInstance(RequestInfo.RequestInfo Request) { instanceUnloaded = new AutoResetEvent(false); SqlWorkflowInstanceStore instanceStore = new SqlWorkflowInstanceStore("server=.;database=aspnetdb;uid=sa;pwd=123456"); IDictionary<string, object> input = new Dictionary<string, object> { { "Request" , Request } }; WorkflowApplication application1 = new WorkflowApplication(new ApplyBlogFlow()); application1.InstanceStore = instanceStore; //工作流当前实例完成 application1.Completed = (workflowApplicationCompletedEventArgs) => { Console.WriteLine("\nWorkflowApplication has Completed in the {0} state.", workflowApplicationCompletedEventArgs.CompletionState); }; //卸载当前工作流 application1.Unloaded = (workflowApplicationEventArgs) => { Console.WriteLine("WorkflowApplication has Unloaded\n"); //发信号,说明值已经被写进去了。 instanceUnloaded.Set(); }; application1.Load(Request.InstanceID); application1.ResumeBookmark("Apply", Request.Agree); //此段代码起作用了,之前是因为默认为true,并没有自动设置为false,故在前面手动设置了一下!2014年9月30日 instanceUnloaded.WaitOne(); Console.ReadLine(); }
有时候我们看似深奥的东西其实并非如此,任何知识只要潜心研究,其实都不难,重要的不是知识本身,而是要解决不怕不知道就怕不知道的问题!