使用Telerik的登陆模板实现DoubanFm的登陆(WP7)

Telerik的控件很强大。我们直接使用其登陆模板。

在装过Telerik WP版后，就可以在VS里非常方便的添加页面了。

我们选择 Sign In Form

其XAML不是很长，直接贴出来

 1 <telerikInput:RadDataForm Grid.Row="1" Margin="12,48,12,0" x:Name="DataForm">
 2                     <telerikInput:RadDataForm.CurrentItem>
 3                         <models:SignInDataModel/>
 4                     </telerikInput:RadDataForm.CurrentItem>
 5                     <Grid>
 6                         <telerikInput:DataField Header="" TargetProperty="UserName">
 7                             <telerikInput:DataField.EditorStyles>
 8                                 <Style TargetType="telerikPrimitives:RadTextBox">
 9                                     <Setter Property="Watermark" Value="username or email"/>
10                                 </Style>
11                             </telerikInput:DataField.EditorStyles>
12                             <telerikInput:DataField.Validators>
13                                 <telerikInput:NonEmptyStringValidator/>
14                             </telerikInput:DataField.Validators>
15                         </telerikInput:DataField>
16                         <telerikInput:DataField Header="" TargetProperty="Password" telerikDataForm:PasswordField.IsPasswordField="True">
17                             <telerikInput:DataField.EditorStyles>
18                                 <Style TargetType="telerikPrimitives:RadPasswordBox">
19                                     <Setter Property="Watermark" Value="password"/>
20                                 </Style>
21                             </telerikInput:DataField.EditorStyles>
22                             <telerikInput:DataField.Validators>
23                                 <telerikInput:NonEmptyStringValidator/>
24                             </telerikInput:DataField.Validators>
25                         </telerikInput:DataField>
26                     </Grid>
27 </telerikInput:RadDataForm>

XAML非常简单简洁，一看就懂，要想加验证也非常容易。

下面的登陆按钮直接将DataForm传至后台

1   <Button Grid.Row="2" Content="sign in" Margin="12" CommandParameter="{Binding ElementName=DataForm}"
2                         Command="{StaticResource DataFormCommitCommand}" />

下面用这个控件来做我们的DoubanFm的登陆。

还是使用MVVMlight，为登陆页面建立一个VM，别忘了在Locator中注册VM。

在VM中暴露一个UserModel属性给View

 1       public const string UserModelPropertyName = "UserModel";
 2         private User usermodel = new User();
 3         public User UserModel
 4         {
 5             get
 6             {
 7                 return usermodel;
 8             }
 9 
10             set
11             {
12                 if (usermodel == value)
13                 {
14                     return;
15                 }
16 
17                 RaisePropertyChanging(UserModelPropertyName);
18                 usermodel = value;
19                 RaisePropertyChanged(UserModelPropertyName);
20             }
21         }

再为登陆按钮设置一个Command，如下：

 1     private RelayCommand<RadDataForm> logincommand;
 2         /// <summary>
 3         /// Gets the LoginCommand.
 4         /// </summary>
 5         public RelayCommand<RadDataForm> LoginCommand
 6         {
 7             get
 8             {
 9                 return logincommand
10                     ?? (logincommand = new RelayCommand<RadDataForm>(
11                                           (dataform) =>
12                                           {
13                                               dataform.Commit();//这样值就到UserModel了
14                                               User user=dataform.CurrentItem as User;
15                                               Debug.WriteLine(user.Username);
16                                               Debug.WriteLine(user.PassWord);
17 
18                                           }));
19             }
20         }

再结合上一篇Rx，我们可以实现DoubanFm的登陆了。

实现起来为了不破坏原先代码的结构，我们把负责Post的Rx利用SimpleIoc注入到早就写好的HttpRequestService类中。

1    MyRxPostMethodService RxService;
2         public HttpRequestService(MyRxPostMethodService rx)
3         {
4             RxService = rx;
5          
6         }

MyRxPostMethodService 就是上篇的HTTPREQUEST类

再对Post包装一下

1    public IObservable<string> Post(string URL, string PostData)
2         {
3          return   RxService.PostMethod(URL, PostData);
4         
5         }

最后再把HttpRequestService注入到LoginVm中

1    private IHttpRequest _httprequest;
2         public LoginViewModel(IHttpRequest http)
3         {
4             _httprequest = http;
5         }

再将Command改为

 1  public RelayCommand<RadDataForm> LoginCommand
 2         {
 3             get
 4             {
 5                 return logincommand
 6                     ?? (logincommand = new RelayCommand<RadDataForm>(
 7                                           (dataform) =>
 8                                           {
 9                                               dataform.Commit();//这样值就到UserModel了
10                                               User user=dataform.CurrentItem as User;
11                                               string username = user.Username;
12                                               string password = user.PassWord;
13                                               _httprequest.Post("http://www.douban.com/j/app/login", "app_name=radio_desktop_win&version=100&email=" + username + "&password=" + password).Subscribe(this.OnLoginStatusChanged);
14                                            
15 
16                                           }));
17             }
18         }

到这里基本大功告成。