SilverLight学习笔记--Silverlight的cookie操作

   本文让我们一起来学习如何利用Silverlight的HtmlPage.Document对象，实现在Silverlight操作Cookies.
    首先创建一个新的Silverlight应用程序,如图:
   
为使用HtmlPage.Document对象，我们要引入命名空间

 using System.Windows.Browser; //引入此空间以便于使用Cookie操作

为操作Cookie,我们创建一个类:SLCookieHelp.cs，此类的操作包括：
 1、添加key-value键值对
 2、根据key删除
 3、根据key读取value
 4、读取cookie所有内容
 5、判断key-value是否在cookie中存在
 代码如下:

using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Windows.Browser; //引入此空间以便于使用Cookie操作

namespace SLCookieOperate
{
    public class SLCookieHelp
    {
        Cookie相关操作函数#region Cookie相关操作函数

        设置持久时间长的Cookie#region 设置持久时间长的Cookie
        /**//// <summary>
        /// 设置持久时间长的Cookie
        /// </summary>
        /// <param name="key">the cookie key</param>
        /// <param name="value">the cookie value</param>
        public  static void SetCookie(string key, string value)
        {

            string oldCookie = HtmlPage.Document.GetProperty("cookie") as String;

            DateTime expiration = DateTime.UtcNow + TimeSpan.FromDays(2000);

            string cookie = String.Format("{0}={1};expires={2}", key, value, expiration.ToString("R"));

            HtmlPage.Document.SetProperty("cookie", cookie);

        }
        #endregion

        读取一个已经存在的Cookie#region 读取一个已经存在的Cookie
        /**//// <summary>
        /// 读取一个已经存在的Cookie
        /// </summary>
        /// <param name="key">cookie key</param>
        /// <returns>null if the cookie does not exist, otherwise the cookie value</returns>
        public static string GetCookie(string key)
        {
            string[] cookies = HtmlPage.Document.Cookies.Split(';');
            key += '=';
            foreach (string cookie in cookies)
            {
                string cookieStr = cookie.Trim();
                if (cookieStr.StartsWith(key, StringComparison.OrdinalIgnoreCase))
                {
                    string[] vals = cookieStr.Split('=');
                    if (vals.Length >= 2)
                    {
                        return vals[1];
                    }
                    return string.Empty;
                }
            }

            return null;
        }
        #endregion

        删除特定的Cookie(清空它的Value值，过期值设置为-1天)#region   删除特定的Cookie(清空它的Value值，过期值设置为-1天)
        /**//// <summary>
        /// 删除特定的Cookie(清空它的Value值，过期值设置为-1天)
        /// </summary>
        /// <param name="key">the cookie key to delete</param>

        public static void DeleteCookie(string key)
        {
            string oldCookie = HtmlPage.Document.GetProperty("cookie") as String;
            DateTime expiration = DateTime.UtcNow - TimeSpan.FromDays(1);
            string cookie = String.Format("{0}=;expires={1}", key, expiration.ToString("R"));
            HtmlPage.Document.SetProperty("cookie", cookie);
        }
        #endregion

        判定指定的key-value对是否在cookie中存在#region 判定指定的key-value对是否在cookie中存在
        public static bool Exists(String key, String value)
        {
            return HtmlPage.Document.Cookies.Contains(
                String.Format("{0}={1}", key, value)
                );
        }
        #endregion

        获取当前cookie内容#region  获取当前cookie内容
        public static string getCookieContent()
        {
            return HtmlPage.Document.GetProperty("cookie") as String;
        }
        #endregion

        #endregion
    }
}

创建用户界面如下图:

用户界面xaml代码如下:

<UserControl x:Class="SLCookieOperate.Page"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    Width="400" Height="400">
    <Grid x:Name="LayoutRoot" Background="White">
        <StackPanel>
            <TextBlock Text="Silverlight操作Cookie学习总结" TextAlignment="Center" Margin="8" FontSize="16" Foreground="red" ></TextBlock>
            <TextBlock Text="请输入Key" TextAlignment="Center" Margin="0,10,0,0"></TextBlock>
            <TextBox x:Name="txtBxKey" Width="250"></TextBox>
            <TextBlock Text="请输入Value" TextAlignment="Center"></TextBlock>
            <TextBox x:Name="txtBxValue"  Width="250"></TextBox>
            <Button Width="200" Height="30" Content="添加key-value对入cookie" Margin="4" Click="Button_Click" ></Button>
            <Button Width="200" Height="30" Content="根据key删除key-value对" Margin="4" Click="Button_Click_1"></Button>
            <Button Width="200" Height="30" Content="根据key读取对应value" Margin="4" Click="Button_Click_2"></Button>
            <Button Width="200" Height="30" Content="读取当前cookie内容" Margin="4" Click="Button_Click_4"></Button>
            <Button Width="200" Height="30" Content="判断存在key-value对" Margin="4" Click="Button_Click_3"></Button>
            <TextBlock Text="当前的Cookie内容" TextAlignment="Center" Foreground="Red"></TextBlock>
            <TextBlock x:Name="tbCookie" TextAlignment="Center" Foreground="Green" TextWrapping="Wrap"  Width="280" ></TextBlock>
            
        </StackPanel>
    </Grid>
</UserControl>

 Page.xaml.cs的代码如下:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Threading;
using System.Text;
using System.IO;
using System.Windows.Browser; //引入此空间以便于使用Cookie操作

namespace SLCookieOperate
{
    public partial class Page : UserControl
    {

        public Page()
        {
            InitializeComponent();

        }


        #region  清除文本输入框
        private void txtBxClear()
        {
            this.txtBxKey.Text = "";
            this.txtBxValue.Text = "";
        }

        #endregion

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                string keyStr = this.txtBxKey.Text.ToString();
                string valueStr = this.txtBxValue.Text.ToString();
                if (!(String.IsNullOrEmpty(keyStr) || String.IsNullOrEmpty(valueStr)))
                {
                    SLCookieHelp.SetCookie(keyStr, valueStr);

                    MessageBox.Show("添加成功！");
                    txtBxClear();

                    // string kk = HtmlPage.Document.Cookies;
                    this.tbCookie.Text = SLCookieHelp.getCookieContent();
                }
                else
                {
                    MessageBox.Show("请输入key-value键值对！");
                }


            }
            catch(Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }

        }

        private void Button_Click_1(object sender, RoutedEventArgs e)
        {
            string keyStr = this.txtBxKey.Text.ToString();

            if (!String.IsNullOrEmpty(keyStr))
            {
                SLCookieHelp.DeleteCookie(keyStr);
                MessageBox.Show("成功删除！");
                this.tbCookie.Text = SLCookieHelp.getCookieContent();

            }
            else
            {
                MessageBox.Show("请输入要删除的Key");
            }
        }

        private void Button_Click_2(object sender, RoutedEventArgs e)
        {

            string keyStr = this.txtBxKey.Text.ToString();

            if (!String.IsNullOrEmpty(keyStr))
            {
                string valueStr = SLCookieHelp.GetCookie(keyStr);

                MessageBox.Show(string.Format("对应你输入的Key的Value是: {0}",valueStr));
            }
            else
            {
                MessageBox.Show("请输入要查找的Key");
            }

        }

        private void Button_Click_3(object sender, RoutedEventArgs e)
        {
            string keyStr = this.txtBxKey.Text.ToString();
            string valueStr = this.txtBxValue.Text.ToString();

            if (!(String.IsNullOrEmpty(keyStr) || String.IsNullOrEmpty(valueStr)))
            {
                if (SLCookieHelp.Exists(keyStr, valueStr))
                {
                    MessageBox.Show("此key-value对存在于cookie中");
                }
                else
                {
                    MessageBox.Show("没有找到此 key-value");
                }
               
            }
            else
            {
                MessageBox.Show("请输入要判定的Key与Value对");
            }
        }

        private void Button_Click_4(object sender, RoutedEventArgs e)
        {
            this.tbCookie.Text = SLCookieHelp.getCookieContent();
        }
    }
}

 运行效果如下:

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本文程序在Silverlight2.0和VS2008环境中调试通过。本文参照了部分网络资料，希望能够抛砖引玉，大家共同学习。
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