在本节中将讲述Silverlight和ASP.NET页面的相互传参的两种常用方式：Cookie和QueryString。首先我们新建一个名为SLConnectASP.NET的Silverlight应用程序，然后在SLConnectASP.NET.web项目中添加一个Index.aspx的页面。

一、Silverlight和ASPX页面的QueryString传参

实现思路：在Silverlight端跳转到页面到Index.aspx并且传递一个QueryString参数ID，在该Index.aspx页面显示出ID。在Index.aspx页面有一个按钮可以向Silverlight所在页面传递一个参数aspxid，在Silverlight端读取aspxid参数并且显示出来。

首先我们看Silverlight后台代码：

#region QueryString传值
//QueryString步骤一
private void button2_Click(object sender, RoutedEventArgs e)
{
 //传递参数给Asp.net页面
 HtmlPage.Window.Eval("location='" +
 Application.Current.Host.Source.AbsoluteUri.Replace(
 Application.Current.Host.Source.AbsolutePath, "") + "/index.aspx?id=203';");
}
//QueryString步骤四
private void ShowQueryString()
{
 //接收到ASP.NET页面传送过来的QueryString值
 IDictionary<String, String> paras = HtmlPage.Document.QueryString;
 if (paras.ContainsKey("aspxid"))
 {
 this.label1.Content = "获取到ASP.NET传值：" + paras["aspxid"];
 }
}
#endregion

#region ASP.NET端操作Silverlight传输过来的QueryString值
//QueryString步骤二
private void BindQueryString()
{
 //ASP.NET端获取到Silverlight传输过来的QueryString值
 if (Request.QueryString.Count > 0)
 {
 this.Label1.Text = "获取到的Silverlight客户端QueryString值是："
 + Request.QueryString["id"].ToString();
 }
}
//QueryString步骤三
protected void Button1_Click(object sender, EventArgs e)
{
 //回传QueryString值给Silverlight客户端
 Response.Redirect("./SLConnectASP.NETTestPage.aspx?aspxid=109");
}
#endregion

二、Silverlight和ASPX页面的Cookie传参

实现思路：在Silverlight端创建一个Key名为FirCookieKey，Value值为FirCookieValue的Cookie，然后跳转页面到Index.aspx页面，在该页面显示出来。在该页面有一个按钮可以修改这个Cookie，并且跳转回Silverlight端，在Silverlight端读取这个已经被修改过的Cookie并且显示出来。

首先我们看Silverlight端的后台代码MainPage.xaml.cs：包括步骤一创建Cookie、步骤四读取被修改过的Cookie

#region Cookie传值
//Cookie步骤一
private void button1_Click(object sender, RoutedEventArgs e)
{

 //编写一个键为FirCookieKey，值为FirCookieValue的Cookie
 string oldCookie = HtmlPage.Document.GetProperty("cookie") as String;
 DateTime expiration = DateTime.UtcNow + TimeSpan.FromDays(2000);
 string cookie = String.Format("{0}={1};expires={2}", "FirCookieKey", 
 "FirCookieValue", expiration.ToString("R"));
 HtmlPage.Document.SetProperty("cookie", cookie);
 //跳转界面
 HtmlPage.Window.Eval("location='" + 
 Application.Current.Host.Source.AbsoluteUri.Replace(
 Application.Current.Host.Source.AbsolutePath, "") + "/index.aspx';");

}
//Cookie步骤四
private void ShowCookie()
{
 //显示当前键为FirCookieKey的Cookie值
 String[] cookies = HtmlPage.Document.Cookies.Split(';');
 foreach (String cookie1 in cookies)
 {
 String[] keyValues = cookie1.Split('=');
 if (keyValues[0] == "FirCookieKey")
 {
 this.textBox2.Content = "Cookie的Key值是：" + keyValues[0];
 this.textBox1.Content = "Cookie的Value值是：" + keyValues[1];

 }
 };
}
#endregion

#region ASP.NET端获取到操作Cookie值
//Cookie操作二
private void BindCookie()
{
 // ASP.NET端获取到Silverlight传输过来的Cookie值
 HttpCookie cookie = Request.Cookies["FirCookieKey"];
 if (cookie.Value != null)
 {
 this.Label2.Text = "获取到的Silverlight客户端Cookie值:" + cookie.Value;
 }

}
//Cookie操作三
protected void Button2_Click(object sender, EventArgs e)
{
 //回传重新设置Cookie值然后传输给Silverlight
 HttpCookie cookie = Request.Cookies["FirCookieKey"];
 cookie.Value = "NewCookieValue";
 HttpContext.Current.Response.Cookies.Add(cookie);
 Response.Redirect("./SLConnectASP.NETTestPage.aspx");
}
#endregion

<Grid x:Name="LayoutRoot" Background="White">
 <sdk:Label Height="27" HorizontalAlignment="Left" Margin="41,25,0,0"
 Name="label1" VerticalAlignment="Top" Width="284" />
 <Button Content="传送浏览器参数" Height="38" HorizontalAlignment="Left"
 Margin="41,63,0,0" Name="button2" VerticalAlignment="Top"
 Width="113" Click="button2_Click" />
 
 <sdk:Label Height="27" HorizontalAlignment="Left" Margin="41,116,0,0" 
 Name="textBox2" VerticalAlignment="Top" Width="284" />
 <sdk:Label Height="27" HorizontalAlignment="Left" Margin="41,149,0,0" 
 Name="textBox1" VerticalAlignment="Top" Width="284" />
 <Button Content="设置Cookie值" Height="38" HorizontalAlignment="Left" 
 Margin="41,194,0,0" Name="button1" VerticalAlignment="Top" 
 Width="113" Click="button1_Click" />
 </Grid>

<div>
 
 <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
 <br />
 <br />
 <asp:Button ID="Button1" runat="server" Text="回传值给Silverlight应用程序QueryString" 
 onclick="Button1_Click" />
 
 <br />
 <br />
 
 <asp:Label ID="Label2" runat="server" Text="Label"></asp:Label>
 <br />
 <asp:Button ID="Button2" runat="server" 
 Text="回传值给Silverlight应用程序Cookie" onclick="Button2_Click" 
 />
 
 <br />
 
 </div>

本实例采用VS2010+Silverlight 4.0编写。如需源码请点击 SLConnectASP.NET.rar 下载。本实例效果图如下：