在Workflow工作流中怎么使用角色

这篇文章主要介绍在Workflow工作流中怎么使用角色，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！

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 EventHandlerSearchBook;    }}

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 EventHandlerSearchBook;        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：

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