WF (Windows Workflow Foundation) 工作流学习（二）一个Asp.Net 与 顺序工作流 结合的例子

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建立一个空的解决方案，向其中加入一个顺序工作流类库和一个Asp.Net Web 应用程序项目，结果如下图

向asp.Net 程序中，添加引用，“WF”是工作流项目，如图

向Web.Config 中加入WF的注册（细节下载代码看一下）。

<section name="roleService" type="System.Web.Configuration.ScriptingRoleServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication" />                 </sectionGroup>             </sectionGroup>         </sectionGroup>          <!--WF注册服务-->         <section name="WorkflowRuntime" type="System.Workflow.Runtime.Configuration.WorkflowRuntimeSection, System.Workflow.Runtime, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>         <!--技术WF注册服务-->      </configSections>          <!--WF注册服务-->      <WorkflowRuntime Name="WorkflowServiceContainer">         <Services>             <add type="System.Workflow.Runtime.Hosting.ManualWorkflowSchedulerService, System.Workflow.Runtime, Version=3.0.00000.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>             <add type="System.Workflow.Activities.ExternalDataExchangeService, System.Workflow.Activities, Version=3.0.00000.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>                      </Services>     </WorkflowRuntime>     <!--结束注册服务-->       <appSettings/>     <connectionStrings/>

添加一个全局Global.asax 文件，添加如下代码

protected void Application_Start(object sender, EventArgs e)        {                        WorkflowRuntime workflowRuntime = new WorkflowRuntime("WorkflowRuntime");            workflowRuntime.StartRuntime();            Application["WorkflowRuntime"] = workflowRuntime;          }         protected void Session_Start(object sender, EventArgs e)        {            WorkflowRuntime workflowRuntime = Application["WorkflowRuntime"] as WorkflowRuntime;            workflowRuntime.StopRuntime();         }

向Default.aspx中添加3个控件，Textbox,button,label ，双击Button为其添加单击事件，并在default.aspx.cs 中添加如下代码

using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls;  using System.Workflow.Runtime; using System.Workflow.Runtime.Hosting; using System.Workflow.ComponentModel; using System.Workflow.Activities; namespace AspNet {     public partial class _Default : System.Web.UI.Page     {         string Result = string.Empty;         protected void Page_Load(object sender, EventArgs e)         {          }          protected void Button1_Click(object sender, EventArgs e)         {             StartWorkflow();             Label1.Text = Result;         }          private void StartWorkflow()         {             WorkflowRuntime workflowRuntime = Application["WorkflowRuntime"] as WorkflowRuntime;               ManualWorkflowSchedulerService scheduler = workflowRuntime.GetService(typeof(ManualWorkflowSchedulerService)) as ManualWorkflowSchedulerService;              workflowRuntime.WorkflowCompleted += new EventHandler<WorkflowCompletedEventArgs>(workflowRuntime_WorkflowCompleted);              Dictionary<String, Object> wfPara = new Dictionary<string, object>();              wfPara.Add("Name", TextBox1.Text);              WorkflowInstance workflowInstance = workflowRuntime.CreateWorkflow(typeof(WF.Workflow1), wfPara);              workflowInstance.Start();              scheduler.RunWorkflow(workflowInstance.InstanceId);         }          void workflowRuntime_WorkflowCompleted(object sender, WorkflowCompletedEventArgs e)         {             if (e.OutputParameters.ContainsKey("Result"))             {                 Result = (string)e.OutputParameters["Result"];             }          }      } }

好了，下面，在WF项目中的Workflow1，拖入一个Code控件，如下图

为CodeActivety1.添加事件代码，方法名字可以自己取，也可以用默认的，我这里用了一个Exefun的方法名，

代码如下

namespace WF {     public sealed partial class Workflow1 : SequentialWorkflowActivity     {          public string Name { get; set; }          public string Result { get; set; }           public Workflow1()         {             InitializeComponent();         }          private void ExeFun(object sender, EventArgs e)         {             Result = "你好：" + Name;         }     }  }

好了，编译一下程序，在TextBox中输入字符串，点击按钮看一下。