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

程序下载地址：  https://files.cnblogs.com/TerryFeng/WF2.rar

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。