Silverlight的cookie操作

怼烎@ 2022-10-25 14:02 201阅读 0赞

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:  
     ![1.png][]  
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:

![复制代码][copycode.gif]

![None.gif][] using  System;  
![None.gif][] using  System.Net;  
![None.gif][] using  System.Windows;  
![None.gif][] using  System.Windows.Controls;  
![None.gif][] using  System.Windows.Documents;  
![None.gif][] using  System.Windows.Ink;  
![None.gif][] using  System.Windows.Input;  
![None.gif][] using  System.Windows.Media;  
![None.gif][] using  System.Windows.Media.Animation;  
![None.gif][] using  System.Windows.Shapes;  
![None.gif][] using  System.Windows.Browser;  // 引入此空间以便于使用Cookie操作   
![None.gif][]   
![None.gif][] namespace  SLCookieOperate  
![ExpandedBlockStart.gif][] \{  
![InBlock.gif][]    public class SLCookieHelp  
![ExpandedSubBlockStart.gif][]    \{  
![ExpandedSubBlockStart.gif][]        \#region Cookie相关操作函数  
![InBlock.gif][]  
![ExpandedSubBlockStart.gif][]        \#region 设置持久时间长的Cookie  
![ExpandedSubBlockStart.gif][]        /// <summary>  
![InBlock.gif][]        /// 设置持久时间长的Cookie  
![InBlock.gif][]        /// </summary>  
![InBlock.gif][]        /// <param name="key">the cookie key</param>  
![ExpandedSubBlockEnd.gif][]        /// <param name="value">the cookie value</param>  
![InBlock.gif][]        public  static void SetCookie(string key, string value)  
![ExpandedSubBlockStart.gif][]        \{  
![InBlock.gif][]  
![InBlock.gif][]            string oldCookie = HtmlPage.Document.GetProperty("cookie") as String;  
![InBlock.gif][]  
![InBlock.gif][]            DateTime expiration = DateTime.UtcNow \+ TimeSpan.FromDays(2000);  
![InBlock.gif][]  
![InBlock.gif][]            string cookie = String.Format("\{0\}=\{1\};expires=\{2\}", key, value, expiration.ToString("R"));  
![InBlock.gif][]  
![InBlock.gif][]            HtmlPage.Document.SetProperty("cookie", cookie);  
![InBlock.gif][]  
![ExpandedSubBlockEnd.gif][]        \}  
![ExpandedSubBlockEnd.gif][]        \#endregion  
![InBlock.gif][]  
![ExpandedSubBlockStart.gif][]        \#region 读取一个已经存在的Cookie  
![ExpandedSubBlockStart.gif][]        /// <summary>  
![InBlock.gif][]        /// 读取一个已经存在的Cookie  
![InBlock.gif][]        /// </summary>  
![InBlock.gif][]        /// <param name="key">cookie key</param>  
![ExpandedSubBlockEnd.gif][]        /// <returns>null if the cookie does not exist, otherwise the cookie value</returns>  
![InBlock.gif][]        public static string GetCookie(string key)  
![ExpandedSubBlockStart.gif][]        \{  
![InBlock.gif][]            string\[\] cookies = HtmlPage.Document.Cookies.Split(';');  
![InBlock.gif][]            key \+= '=';  
![InBlock.gif][]            foreach (string cookie in cookies)  
![ExpandedSubBlockStart.gif][]            \{  
![InBlock.gif][]                string cookieStr = cookie.Trim();  
![InBlock.gif][]                if (cookieStr.StartsWith(key, StringComparison.OrdinalIgnoreCase))  
![ExpandedSubBlockStart.gif][]                \{  
![InBlock.gif][]                    string\[\] vals = cookieStr.Split('=');  
![InBlock.gif][]                    if (vals.Length >= 2)  
![ExpandedSubBlockStart.gif][]                    \{  
![InBlock.gif][]                        return vals\[1\];  
![ExpandedSubBlockEnd.gif][]                    \}  
![InBlock.gif][]                    return string.Empty;  
![ExpandedSubBlockEnd.gif][]                \}  
![ExpandedSubBlockEnd.gif][]            \}  
![InBlock.gif][]  
![InBlock.gif][]            return null;  
![ExpandedSubBlockEnd.gif][]        \}  
![ExpandedSubBlockEnd.gif][]        \#endregion  
![InBlock.gif][]  
![ExpandedSubBlockStart.gif][]        \#region   删除特定的Cookie(清空它的Value值，过期值设置为-1天)  
![ExpandedSubBlockStart.gif][]        /// <summary>  
![InBlock.gif][]        /// 删除特定的Cookie(清空它的Value值，过期值设置为-1天)  
![InBlock.gif][]        /// </summary>  
![ExpandedSubBlockEnd.gif][]        /// <param name="key">the cookie key to delete</param>  
![InBlock.gif][]  
![InBlock.gif][]        public static void DeleteCookie(string key)  
![ExpandedSubBlockStart.gif][]        \{  
![InBlock.gif][]            string oldCookie = HtmlPage.Document.GetProperty("cookie") as String;  
![InBlock.gif][]            DateTime expiration = DateTime.UtcNow \- TimeSpan.FromDays(1);  
![InBlock.gif][]            string cookie = String.Format("\{0\}=;expires=\{1\}", key, expiration.ToString("R"));  
![InBlock.gif][]            HtmlPage.Document.SetProperty("cookie", cookie);  
![ExpandedSubBlockEnd.gif][]        \}  
![ExpandedSubBlockEnd.gif][]        \#endregion  
![InBlock.gif][]  
![ExpandedSubBlockStart.gif][]        \#region 判定指定的key-value对是否在cookie中存在  
![InBlock.gif][]        public static bool Exists(String key, String value)  
![ExpandedSubBlockStart.gif][]        \{  
![InBlock.gif][]            return HtmlPage.Document.Cookies.Contains(  
![InBlock.gif][]                String.Format("\{0\}=\{1\}", key, value)  
![InBlock.gif][]                );  
![ExpandedSubBlockEnd.gif][]        \}  
![ExpandedSubBlockEnd.gif][]        \#endregion  
![InBlock.gif][]  
![ExpandedSubBlockStart.gif][]        \#region  获取当前cookie内容  
![InBlock.gif][]        public static string getCookieContent()  
![ExpandedSubBlockStart.gif][]        \{  
![InBlock.gif][]            return HtmlPage.Document.GetProperty("cookie") as String;  
![ExpandedSubBlockEnd.gif][]        \}  
![ExpandedSubBlockEnd.gif][]        \#endregion  
![InBlock.gif][]  
![ExpandedSubBlockEnd.gif][]        \#endregion  
![ExpandedSubBlockEnd.gif][]    \}  
![ExpandedBlockEnd.gif][]\}   
![None.gif][]

![复制代码][copycode.gif]

创建用户界面如下图:  
![2.png][]  
用户界面xaml代码如下:

![复制代码][copycode.gif]

< 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 >

![复制代码][copycode.gif]

Page.xaml.cs的代码如下:

![复制代码][copycode.gif]

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();  
        \}  
    \}  
\}

![复制代码][copycode.gif]

运行效果如下:  
![3.png][]

[前往：Silverlight学习笔记清单][Silverlight]

原文地址：[http://www.cnblogs.com/wsdj-ITtech/archive/2009/08/15/1546815.html][http_www.cnblogs.com_wsdj-ITtech_archive_2009_08_15_1546815.html]

[1.png]: /images/20221024/65809be9c98f48a8bb4aa9a3c95cf16d.png
[copycode.gif]: /images/20221024/9b8f51cbf2554e8a9d860af791daa398.png
[None.gif]: /images/20221024/2122a38c838f4c73b15c0c59ddacfaa4.png
[ExpandedBlockStart.gif]: /images/20221024/1aa95af3382349038e31855b97008f08.png
[InBlock.gif]: /images/20221024/18c1b87724c640c8aaee9556877bc637.png
[ExpandedSubBlockStart.gif]: /images/20221024/d83d483d8bbc460a84852edfb173e238.png
[ExpandedSubBlockEnd.gif]: /images/20221024/4228bfc5c88c4b7a8c12af82e0763a61.png
[ExpandedBlockEnd.gif]: /images/20221024/e3caa8bf6da0472bbefc8202f381dbd3.png
[2.png]: /images/20221024/88e2808d766449a2ace5df1802e71f28.png
[3.png]: /images/20221024/b4e33f12ef6a4303a09e547eba662e80.png
[Silverlight]: http://www.cnblogs.com/wsdj-ITtech/archive/2009/08/31/1557103.html
[http_www.cnblogs.com_wsdj-ITtech_archive_2009_08_15_1546815.html]: http://www.cnblogs.com/wsdj-ITtech/archive/2009/08/15/1546815.html