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概述

Silverlight 2 Beta 1版本發布了，無論從Runtime還是Tools都給我們帶來了很多的驚喜，如支持框架語言Visual Basic, Visual C#, IronRuby, IronPython，對JSON、Web Service、WCF以及Sockets的支持等一系列新的特性。《一步一步學Silverlight 2系列》文章將從Silverlight 2基礎知識、數據與通信、自定義控件、動畫、圖形圖像等幾個方面帶您快速進入Silverlight 2開發。

本文是Silverlight 2與瀏覽器交互的最后一篇，將介紹相關的輔助類方法。

獲取瀏覽器信息

在Silverlight 2中提供了獲取瀏覽器信息的一個類BrowserInformation，可供我們直接調用，如獲取瀏覽器名稱及瀏覽器版本，是否禁用Cookies等信息。做一個簡單的示例，定義XAML如下：

<Grid x:Name="LayoutRoot" Background="#CDFCAE">    <Grid.RowDefinitions>        <RowDefinition Height="40"></RowDefinition>        <RowDefinition Height="40"></RowDefinition>        <RowDefinition Height="40"></RowDefinition>        <RowDefinition Height="40"></RowDefinition>        <RowDefinition Height="140"></RowDefinition>    </Grid.RowDefinitions>    <Grid.ColumnDefinitions>        <ColumnDefinition Width="300"></ColumnDefinition>        <ColumnDefinition Width="300"></ColumnDefinition>    </Grid.ColumnDefinitions>    <TextBlock Text="Name:" Style="{StaticResource title}"               Grid.Row="0" Grid.Column="0"></TextBlock>    <TextBlock x:Name="Name" Style="{StaticResource content}"               Grid.Row="0" Grid.Column="1"></TextBlock>    <TextBlock Text="BrowserVersion:" Style="{StaticResource title}"               Grid.Row="1" Grid.Column="0"></TextBlock>    <TextBlock x:Name="BrowserVersion" Style="{StaticResource content}"               Grid.Row="1" Grid.Column="1"></TextBlock>    <TextBlock Text="CookiesEnabled:" Style="{StaticResource title}"               Grid.Row="2" Grid.Column="0"></TextBlock>    <TextBlock x:Name="CookiesEnabled" Style="{StaticResource content}"               Grid.Row="2" Grid.Column="1"></TextBlock>    <TextBlock Text="Platform:" Style="{StaticResource title}"               Grid.Row="3" Grid.Column="0"></TextBlock>    <TextBlock x:Name="Platform" Style="{StaticResource content}"               Grid.Row="3" Grid.Column="1"></TextBlock>    <TextBlock Text="UserAgent:" Style="{StaticResource title}"               Grid.Row="4" Grid.Column="0"></TextBlock>    <TextBlock x:Name="UserAgent" Style="{StaticResource content}"               Grid.Row="4" Grid.Column="1" TextWrapping="Wrap"></TextBlock></Grid>

在Loaded事件中獲取相關信息：

private void UserControl_Loaded(object sender, RoutedEventArgs e){    BrowserInformation browser = HtmlPage.BrowserInformation;    Name.Text = browser.Name;    BrowserVersion.Text = browser.BrowserVersion.ToString();    CookiesEnabled.Text = browser.CookiesEnabled.ToString();    Platform.Text = browser.Platform;    UserAgent.Text = browser.UserAgent;}

運行之后，如下圖所示：

TerryLee_Silverlight2_0113

HttpUtility方法

類似于WebForm開發中一樣，在Silverlight 2中同樣提供了一一些HttpUtility方法，共有四個HtmlEncode、HtmlDecode、UrlEncode、UrlDecode，看一個簡單的例子：

<Grid x:Name="LayoutRoot" Background="#CDFCAE">    <Grid.RowDefinitions>        <RowDefinition Height="75"></RowDefinition>        <RowDefinition Height="75"></RowDefinition>        <RowDefinition Height="75"></RowDefinition>        <RowDefinition Height="75"></RowDefinition>    </Grid.RowDefinitions>    <Grid.ColumnDefinitions>        <ColumnDefinition Width="400"></ColumnDefinition>        <ColumnDefinition Width="200"></ColumnDefinition>    </Grid.ColumnDefinitions>    <TextBox x:Name="txtHtmlEncode" Grid.Row="0" Grid.Column="0"              Width="300" Height="40"></TextBox>    <Button x:Name="btnHtmlEncode" Grid.Row="0" Grid.Column="1"             Background="Red" Width="120" Height="40" Content="HtmlEncode"            Click="btnHtmlEncode_Click"></Button>    <TextBox x:Name="txtHtmlDecode" Grid.Row="1" Grid.Column="0"              Width="300" Height="40"></TextBox>    <Button x:Name="btnHtmlDecode" Grid.Row="1" Grid.Column="1"             Background="Red" Width="120" Height="40" Content="HtmlDecode"            Click="btnHtmlDecode_Click"></Button>    <TextBox x:Name="txtUrlEncode" Grid.Row="2" Grid.Column="0"              Width="300" Height="40"></TextBox>    <Button x:Name="btnUrlEncode" Grid.Row="2" Grid.Column="1"             Background="Red" Width="120" Height="40" Content="UrlEncode"            Click="btnUrlEncode_Click"></Button>    <TextBox x:Name="txtUrlDecode" Grid.Row="3" Grid.Column="0"              Width="300" Height="40"></TextBox>    <Button x:Name="btnUrlDecode" Grid.Row="3" Grid.Column="1"             Background="Red" Width="120" Height="40" Content="UrlDecode"            Click="btnUrlDecode_Click"></Button></Grid>

編寫按鈕處理事件：

private void btnHtmlEncode_Click(object sender, RoutedEventArgs e){    this.txtHtmlDecode.Text = HttpUtility.HtmlEncode(this.txtHtmlEncode.Text);}private void btnHtmlDecode_Click(object sender, RoutedEventArgs e){    this.txtHtmlEncode.Text = HttpUtility.HtmlDecode(this.txtUrlDecode.Text);}private void btnUrlEncode_Click(object sender, RoutedEventArgs e){    this.txtUrlDecode.Text = HttpUtility.UrlEncode(this.txtUrlEncode.Text);}private void btnUrlDecode_Click(object sender, RoutedEventArgs e){    this.txtUrlEncode.Text = HttpUtility.UrlDecode(this.txtUrlDecode.Text);}