概述

Silverlight 2 Beta 1版本发布了，无论从Runtime还是Tools都给我们带来了很多的惊喜，如支持框架语言Visual Basic, Visual C#, IronRuby, Ironpython，对JSON、Web Service、WCF以及Sockets的支持等一系列新的特性。《一步一步学Silverlight 2系列》文章将从Silverlight 2基础知识、数据与通信、自定义控件、动画、图形图像等几个方面带您快速进入Silverlight 2开发。

本文是Silverlight 2与浏览器交互的最后一篇，将介绍相关的辅助类方法。

获取浏览器信息

在Silverlight 2中提供了获取浏览器信息的一个类BrowserInformation，可供我们直接调用，如获取浏览器名称及浏览器版本，是否禁用Cookies等信息。做一个简单的示例，定义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事件中获取相关信息：

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;
}

运行之后，如下图所示：

HttpUtility方法

类似于WebForm开发中一样，在Silverlight 2中同样提供了一一些HttpUtility方法，共有四个HtmlEncode、HtmlDecode、UrlEncode、UrlDecode，看一个简单的例子：

<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>

编写按钮处理事件：

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);
}

运行后测试如下：

结束语

本文简单介绍了Silverlight 2与浏览器交互的相关辅助类方法。

2.jpg

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