Silverlight实用窍门系列：37.Silverlight和ASP.NET相互传参的两种常用方式(QueryString,Cookie)【附带实例源码】

 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

        然后我们来看Index.aspx.cs的代码如下：

#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

         接着我们来看Index.aspx.cs，包括Cookie操作二和Cookie操作三

#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

        最后这两个实例的MainPage.xaml的代码如下：

< 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 >

        Index.aspx的代码如下：

< 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：

本文转自程兴亮博客园博客，原文链接：http://www.cnblogs.com/chengxingliang/archive/2011/04/14/2015085.html，如需转载请自行联系原作者