在silverlight中使用IsolateStore隔离存储(上)

< Grid  x:Name ="LayoutRoot"  Background ="AliceBlue" >
     < Grid.RowDefinitions >
         < RowDefinition   Height ="40" />
         < RowDefinition   Height ="40" />             
         < RowDefinition   Height ="231" />
         < RowDefinition  Height ="*" />
     </ Grid.RowDefinitions >
     < Grid.ColumnDefinitions >
         < ColumnDefinition  Width ="122"   />
         < ColumnDefinition  Width ="*"   />
     </ Grid.ColumnDefinitions >

     < TextBlock  Grid.Row ="0"  Grid.Column ="0"   Margin ="5,5,57,5"  HorizontalAlignment ="Stretch" >
      < Run  Text ="收件人:" />
     </ TextBlock >
     < TextBox  x:Name ="Recipient"   Width ="200"  Grid.Row ="0"  Grid.Column ="1"  HorizontalAlignment ="Left"  Margin ="5,5,0,5" />

     < TextBlock  Grid.Row ="1"  Grid.Column ="0"  Margin ="5,5,57,5"  HorizontalAlignment ="Stretch" >
      < Run  Text ="主 题:" />
     </ TextBlock >
     < TextBox  x:Name ="Subject"   Width ="200"  Grid.Row ="1"  Grid.Column ="1"  HorizontalAlignment ="Left"  Margin ="5,5,0,5" />

     < TextBlock  Grid.Row ="2"  Grid.Column ="0"  Margin ="5,5,57,36"  HorizontalAlignment ="Stretch"   >
      < Run  Text ="内 容:" />
     </ TextBlock >
     < TextBox  x:Name ="Body"  TextWrapping ="Wrap"   Grid.Row ="2"  Grid.Column ="1"  HorizontalAlignment ="Stretch"  Margin ="5,5,8,5"  Grid.RowSpan ="1" />
    
     < StackPanel  Grid.ColumnSpan ="2"  Grid.Row ="3"  Orientation ="Horizontal"  Grid.Column ="0"  HorizontalAlignment ="Stretch"  VerticalAlignment ="Stretch"  Margin ="8,23.5,64,8" >
         < Button  x:Name ="SaveToDraft"  Margin ="5,5,5,5"  Content =" 保存为草稿(本地) "  Click ="SaveToDraft_Click"   />
         < Button  x:Name ="SaveToServer"  Margin ="5,5,5,5"  Content =" 上传到服务器 "   Click ="SaveToServer_Click" />
         < Button  x:Name ="DeleteDraft"  Margin ="5,5,5,5"  Content =" 删除当前草稿(本地) "  Click ="DeleteDraft_Click"   />
     </ StackPanel >
</ Grid >

    
    而相应的page.xaml.cs(位于源码包中的IsolatedStore_Demo文件夹)代码如下：    

public   partial   class  Page : UserControl
 {
      private  IsolatedStorageSettings appSettings  =
        IsolatedStorageSettings.ApplicationSettings; // 获取当前应用(silverlight Application) IsolatedStorageSettings  实例,范围在当前应用 
      // IsolatedStorageSettings appSettings =
         // IsolatedStorageSettings.SiteSettings; // 获取当前应用(silverlight Application) IsolatedStorageSettings  实例,范围在当前域 

      public  Page()
     {
         InitializeComponent();
          this .Loaded  +=   new  RoutedEventHandler(Page_Loaded);
     }

      void  Page_Loaded( object  sender, RoutedEventArgs e)
     {
          try
         {
              // 加载相应节点信息,首次运行时会报为空的错误
             Recipient.Text  =  ( string ) appSettings[ " Recipient " ];
             Subject.Text  =  ( string )appSettings[ " Subject " ];
             Body.Text  =  ( string )appSettings[ " Body " ];
         }
          catch  (System.Collections.Generic.KeyNotFoundException ex)
         {
             HtmlPage.Window.Alert(ex.Message);
         }

     }

      private   void  SaveToDraft_Click( object  sender, RoutedEventArgs e)
     {
          try
         {    // 添加相应节点信息
             appSettings.Add( " Recipient " , Recipient.Text);
             appSettings.Add( " Subject " , Subject.Text);
             appSettings.Add( " Body " , Body.Text);
             HtmlPage.Window.Alert( " 已存入本地隔离存储区 " );
         }
          catch  (ArgumentException ex)
         {
             HtmlPage.Window.Alert(ex.Message);
         }
     }

      private   void  DeleteDraft_Click( object  sender, RoutedEventArgs e)
     {
          try
         {
              // 移除相当节点信息
             appSettings.Remove( " Recipient " );
             appSettings.Remove( " Subject " );
             appSettings.Remove( " Body " );
             HtmlPage.Window.Alert( " 已从本地隔离存储区中删除该草稿 " );
         }
          catch  (ArgumentException ex)
         {
             HtmlPage.Window.Alert(ex.Message);
         }

     }

      private   void  SaveToServer_Click( object  sender, RoutedEventArgs e)
     {
          // 创建EMAIL信息类,以此作为上传数据
         EmailInfo emailInfo  =   new  EmailInfo()
         {
             Recipientk__BackingField  =  Recipient.Text,
             Subjectk__BackingField  =  Subject.Text,
             Bodyk__BackingField  =  Body.Text
         };

         EmailClient emailClient  =   new  EmailClient();
          // 调用WCF方法
         emailClient.AcceptCompleted  +=   new  EventHandler < AcceptCompletedEventArgs > (email_AcceptCompleted);
         emailClient.AcceptAsync(emailInfo);
     }

      void  email_AcceptCompleted( object  sender, AcceptCompletedEventArgs e)
     {
          if  (e.Result)
         {
             HtmlPage.Window.Alert( " 上传成功 " );
         }
          else
         {
             HtmlPage.Window.Alert( " 上传失败 " );
         }
     }

 }