详解在Workflow工作流中如何使用角色

WF（Workflow）中提供来两种方式：ActiveDirectoryRole(通过活动目录用户)和WebWorkflowRole(ASP.NET Role)。下面举例说明：

1.我们使用HandleExternalEventActivity活动来提供图书检索功能，当有人检索的时候会触发检索事件，只有会员才可以使用该功能。首先来定义事件参数：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Workflow.Activities;

namespace CaryWFRole
{
    [Serializable]
    public class BookEventArgs : ExternalDataEventArgs
    {
        public string ID { get; set; }
        public string Name { get; set; }
        public string Author { get; set; }

        public BookEventArgs()
            : base(Guid.NewGuid())
        { }

        public BookEventArgs(Guid instanceID, string id, string name, string author)
            : base(instanceID)
        {
            this.ID = id;
            this.Name = name;
            this.Author = author;
        }
    }
}

2.事件接口如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Workflow.Activities;

namespace CaryWFRole
{
    [ExternalDataExchangeAttribute()]
    public interface ISearchBookService
    {
        event EventHandler
     
       SearchBook; } }

3.实现该接口，代码如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Principal;

namespace CaryWFRole
{
    public class SearchBookService:ISearchBookService
    {
        public event EventHandler
     
       SearchBook; public void OnSearchRequest(Guid instanceId, string id,string name,string author, IIdentity identity) { BookEventArgs args = new BookEventArgs(instanceId, id, name, author); String securityIdentifier = null; WindowsIdentity windowsIdentity = identity as WindowsIdentity; if (windowsIdentity != null && windowsIdentity.User != null) securityIdentifier = windowsIdentity.User.Translate(typeof(NTAccount)).ToString(); else if (identity != null) securityIdentifier = identity.Name; args.Identity = securityIdentifier; Console.WriteLine("return book by: {0}", identity.Name); if (SearchBook != null) SearchBook(null, args); } } }

4.工作流设计如下：

通过设置检索事件（HandleExternalEventActivity）活动的的Roles属性来控制，只有该角色集合的用户才有权限。在工作流中我们只允许会员才可以做
检索，代码如下：

using System;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Collections;
using System.Drawing;
using System.Linq;
using System.Workflow.ComponentModel.Compiler;
using System.Workflow.ComponentModel.Serialization;
using System.Workflow.ComponentModel;
using System.Workflow.ComponentModel.Design;
using System.Workflow.Runtime;
using System.Workflow.Activities;
using System.Workflow.Activities.Rules;

namespace CaryWFRole
{
    public sealed partial class BookWorkflow : SequentialWorkflowActivity
    {
        public BookWorkflow()
        {
            InitializeComponent();
        }

        private WorkflowRoleCollection sAllowRoles = new WorkflowRoleCollection();

        public WorkflowRoleCollection AllowRoles
        {
            get { return sAllowRoles; }
        }

        private void codeActivity1_ExecuteCode(object sender, EventArgs e)
        {
            WebWorkflowRole role = new WebWorkflowRole("会员");
            AllowRoles.Add(role);
        }

        private void handleExternalEventActivity1_Invoked(object sender, ExternalDataEventArgs e)
        {
            Console.WriteLine("查询成功");
        }
    }
}

5.通过如下函数来创建角色和用户，代码如下：

static void CreateRoles()
{
     if (!System.Web.Security.Roles.RoleExists("会员"))
     {
         System.Web.Security.Roles.CreateRole("会员");
         string[] users = { "张三", "李四", "王五" };
         string[] ClerkRole = { "会员" };
         System.Web.Security.Roles.AddUsersToRoles(users, ClerkRole);
     }           
}

6.假设以张三的身份来检索，触发事件的函数如下：

static void SendSearchRequest()
{
       try
       {                
            string id = "001";
            string name = "C#高级编程";
            string author = "某某某";
                
            GenericIdentity genIdentity = new GenericIdentity("张三");
            sBook.OnSearchRequest(workflowInstanceId, id, name, author, genIdentity);
       }
       catch (Exception e)
       {
            Console.WriteLine("Exception message: {0}", e.ToString());
       }
}

7.宿主程序如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Workflow.Runtime;
using System.Workflow.Runtime.Hosting;
using System.Security.Principal;
using System.Workflow.Activities;

namespace CaryWFRole
{
    class Program
    {
        static SearchBookService sBook;
        static Guid workflowInstanceId;
        static AutoResetEvent waitHandle = new AutoResetEvent(false);

        static void Main()
        {
            CreateRoles();
            using (WorkflowRuntime workflowRuntime = new WorkflowRuntime())
            {
                workflowRuntime.StartRuntime();
                Type type = typeof(BookWorkflow);
                ExternalDataExchangeService dataService = new ExternalDataExchangeService();
                workflowRuntime.AddService(dataService);

                sBook = new SearchBookService();
                dataService.AddService(sBook);

                workflowRuntime.WorkflowCompleted += OnWorkflowCompleted;
                workflowRuntime.WorkflowTerminated += OnWorkflowTerminated;

                WorkflowInstance instance = workflowRuntime.CreateWorkflow(type);
                workflowInstanceId = instance.InstanceId;
                instance.Start();
                SendSearchRequest();
                waitHandle.WaitOne();
                workflowRuntime.StopRuntime();
            }
        }

        static void OnWorkflowCompleted(object sender, WorkflowCompletedEventArgs e)
        {
            waitHandle.Set();
        }
        static void OnWorkflowTerminated(object sender, WorkflowTerminatedEventArgs e)
        {
            Console.WriteLine(e.Exception.Message);
            waitHandle.Set();
        }
    }
}

8.我们要配置aspnetdb数据库，app.config如下：

9.执行结果如下：

【编辑推荐】

详解工作流架构与实现
协同软件：对工作流的几点谬误的解析
面向构件的中间件：超越工作流管理

文章名称：详解在Workflow工作流中如何使用角色
URL地址：http://www.shufengxianlan.com/qtweb/news41/471791.html

网站建设、网络推广公司-创新互联，是专注品牌与效果的网站制作，网络营销seo公司；服务项目有等

声明：本网站发布的内容（图片、视频和文字）以用户投稿、用户转载内容为主，如果涉及侵权请尽快告知，我们将会在第一时间删除。文章观点不代表本网站立场，如需处理请联系客服。电话：028-86922220；邮箱：631063699@qq.com。内容未经允许不得转载，或转载时需注明来源：创新互联

猜你还喜欢下面的内容