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:

posted @ 2011-04-14 10:23  程兴亮  阅读(4606)  评论(3编辑  收藏