.net ria service在实际应用中提供了方便快速的数据访问层，那么身份验证也是一个比较头痛的事情，这个问题曾经也一度困扰着我。
最到最近.net ria service home的出现才找到最合适自己使用的方法，不过还是有一些bug，可能是.net ria service还是ctp版的原因。
这里简单讲述一下bug：
客户端可以取得roles的列表，可惜在domain service class里的定义不生效。希望这个问题在.net ria service的下个版本会解决。
在常规使用中我更喜欢使用自定义的表去管理程序的用户，这样灵活度比较高，而且心中也有数，所以一直不想用membership做用户的管理。所以一直寻找.net ria service中的自定义身份验证。祥细操作如下：
1)新建一个domain service class作为验证身份之用。
1: namespace jacSL3RTMAuthentication.Web
2: {
3: using System;
4: using System.Collections.Generic;
5: using System.ComponentModel;
6: using System.ComponentModel.DataAnnotations;
7: using System.Linq;
8: using System.Web.Ria;
9: using System.Web.Ria.Data;
10: using System.Web.DomainServices;
11: using System.Data;
12: using System.Web.DomainServices.LinqToEntities;
13: using System.Web.Ria.ApplicationServices;
14: using System.Web;
15: using System.Web.Security;
16:
17:
18: // Implements application logic using the authenEntities context.
19: // TODO: Add your application logic to these methods or in additional methods.
20: [EnableClientAccess()]
21: public class LoginDomainService : LinqToEntitiesDomainService<authenEntities>,IAuthentication<myUser>
22: {
23: #region IAuthentication<myUser> Members
24:
25: public myUser GetUser()
26: {
27: if ((HttpContext.Current != null) && (HttpContext.Current.User != null) &&
28: HttpContext.Current.User.Identity.IsAuthenticated)
29: {
30: var ut = this.Context.userTable.First(u => u.userId.Equals(HttpContext.Current.User.Identity.Name));
31: return new myUser() { Name = ut.userId };
32: }
33: return null;
34: }
35:
36: public myUser Login(string userName, string password, bool isPersistent, string customData)
37: {
38: if ((from u in Context.userTable where u.userId.Equals(userName) select u).Count() ==1 )
39: {
40: var user = Context.userTable.First(u => u.userId.Equals(userName));
41: if (user.pwd.Equals(password))
42: {
43: FormsAuthentication.SetAuthCookie(user.userId, isPersistent);
44: return new myUser() { Name=user.userId };
45: }
46: }
47: return null;
48: }
49:
50: public myUser Logout()
51: {
52: FormsAuthentication.SignOut();
53: return null;
54: }
55:
56: public void UpdateUser(myUser user)
57: {
58: throw new NotImplementedException();
59: }
60:
61: #endregion
62: }
63:
64: public class myUser : IUser
65: {
66:
67: #region IUser Members
68: [Key]
69: public string Name
70: {
71: get;
72: set;
73: }
74:
75: public IEnumerable<string> Roles
76: {
77: get;
78: set;
79: }
80:
81: #endregion
82: }
83: }
2)使用时先到silverlight端的app.xaml中把身份验证定义
1: <Application xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
2: xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
3: xmlns:app="clr-namespace:jacSL3RTMAuthentication"
4: xmlns:appsvc="clr-namespace:System.Windows.Ria.ApplicationServices;assembly=System.Windows.Ria"
5: x:Class="jacSL3RTMAuthentication.App"
6: >
7: <Application.ApplicationLifetimeObjects>
8: <app:RiaContext>
9: <app:RiaContext.Authentication>
10: <appsvc:FormsAuthentication DomainContextType="jacSL3RTMAuthentication.Web.LoginDomainService" />
11: <!--<appsvc:WindowsAuthentication/>-->
12: </app:RiaContext.Authentication>
13: </app:RiaContext>
14: </Application.ApplicationLifetimeObjects>
15: </Application>
16:
jacSL3RTMAuthentication.Web.LoginDomainService是我定义的命名及空间，实际开发时请按你自己的命名及空间。
3)使用方法，以下是我的一些测试验证的代码：
1: using System.Windows.Ria.ApplicationServices;
2:
3: namespace jacSL3RTMAuthentication
4: {
5: public partial class MainPage : UserControl
6: {
7: private AuthenticationService authSv = RiaContext.Current.Authentication;
8: private AuthenticationOperation authOp;
9:
10: public MainPage()
11: {
12: InitializeComponent();
13: bt_login.Click += new RoutedEventHandler(bt_login_Click);
14: }
15:
16: void bt_login_Click(object sender, RoutedEventArgs e)
17: {
18: authOp = authSv.Login(new LoginParameters(tb_userid.Text, tb_pwd.Password, true, null));
19: authOp.Completed += new EventHandler(authOp_Completed);
20: }
21:
22: void authOp_Completed(object sender, EventArgs e)
23: {
24: LoginOperation lo = (LoginOperation)sender;
25:
26: if (lo.LoginSuccess)
27: {
28: MessageBox.Show("welcome " + lo.User.Identity.Name);
29: }
30:
31: if (lo.HasError)
32: {
33: MessageBox.Show(lo.Error.Message);
34: }
35:
36: jacSL3RTMAuthentication.Web.dataDomainContext data = new jacSL3RTMAuthentication.Web.dataDomainContext();
37: dg.ItemsSource = data.pdTables;
38: data.Load(data.GetPdTableQuery());
39:
40: authSv.Logout();
41: }
42: }
43: }
结束语：
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