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c#教程之在WF中使用角色
WF提供了一种用于对所有支持数据输入的活动的、基于角色的访问机制。工作流创建者可以完全控制如何创建角色和角色集合。这样将使创建者能够提供必
要的授权机制，在执行活动之前验证调用者的角色。比如WF中的WebServiceInputActivity 和 HandleExternalEventActivity活动。
WF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<BookEventArgs> 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<BookEventArgs> 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：
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<connectionStrings>
<add name="SqlServerConnection"
connectionString="Integrated Security = SSPI;server=.;database=aspnetdb" />
</connectionStrings>
<system.web>
<roleManager enabled="true" defaultProvider="SqlProvider">
<providers>
<add name="SqlProvider" connectionStringName="SqlServerConnection"
applicationName="ConsoleAppSample" type="System.Web.Security.SqlRoleProvider,
System.Web, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
</providers>
</roleManager>
</system.web>
</configuration>
9.执行结果如下：
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<BookEventArgs> 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<BookEventArgs> 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);
}
}
}
