Silverlight 2终于解决了上述的两个问题,支持跨域获取数据,支持中文显示,于是我迫不及待的尝试着开发了一个饭否Show(在Silverlight 2 beta SDK 发布的几日后开始开发,开发完成后便忘记了,-___-|||),下面来简要的分享一下开发过程,也望各位Silverlight前辈不吝指教。
UI
UI的界面如下图所示:UI采用Blend 2.5和Design设计。
如果设计简单的Silverlight界面,那么Blend足矣,但稍复杂的,比如上图中的波浪渐变效果,Blend就无能为力了,而这正是Design的拿手本领。
Design的使用方法就不介绍了,设计完毕后,导出为Silverlight画布,然后我们copy需要的XAML节点即可。
具体的XAML内容就不在此展示了,文末我提供了本文的代码下载,有兴趣的朋友可以下载查看。
饭否API
从上图来分析,我们只用到了饭否中的两部分信息:我的信息和我的消息。在 饭否API中,获取这两部分数据的方法如下:
获取用户信息:
http://api.fanfou.com/users/show/ 用户ID.xml
获取用户消息:
http://api.fanfou.com/statuses/user_timeline/ 用户ID.rss
那么根据饭否提供的API,我编写了下面两个类:
饭否API类
using System;
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.IO;
using System.Linq;
using System.Xml;
using System.Xml.Linq;
using System.Collections.Generic;
namespace SilverlightFanShow
{
/**////
/// 饭否用户
///
public class FanfouUser
{
/**////
/// 用户头像的URL
///
public Uri ImageURL{get;set;}
/**////
/// 用户的显示名称
///
public string Name{get;set;}
/**////
/// 用户的饭否链接地址
///
public Uri URL{get;set;}
/**////
/// 从Stream加载饭否用户实例
///
///
///
public static FanfouUser Load(Stream stream)
{
FanfouUser user = new FanfouUser();
try
{
XmlReader reader = XmlReader.Create(stream);
XElement doc = XElement.Load(reader);
user.ImageURL = new Uri(doc.Descendants("profile_image_url").FirstOrDefault().Value);
user.Name = doc.Descendants("name").FirstOrDefault().Value;
user.URL = new Uri(doc.Descendants("url").FirstOrDefault().Value);
}
catch { }
return user;
}
/**////
/// 默认构造函数
///
public FanfouUser()
{
this.ImageURL = new Uri("http://avatar.fanfou.com/s0/00/4q/py.jpg?1183096447");
this.Name = "Windie";
this.URL = new Uri("http://fanfou.com/笑煞天");
}
}
/**////
/// 饭否消息
///
public class FanfouMessage
{
/**////
/// 饭否消息的GUID(注:并不是.NET里的GUID)
///
public string GUID { get; set; }
/**////
/// 饭否消息本体
///
public string Message { get; set; }
/**////
/// 饭否消息的发布时间
///
public DateTime Time { get; set; }
/**////
/// 从Stream加载饭否消息列表
///
///
///
public static List<FanfouMessage> Load(Stream stream)
{
List<FanfouMessage> msgList = new List<FanfouMessage>();
try
{
XmlReader reader = XmlReader.Create(stream);
XElement doc = XElement.Load(reader);
IEnumerable<XElement> msgs = from item in doc.Descendants("item")
select item;
foreach (XElement item in msgs)
{
FanfouMessage msg = new FanfouMessage();
msg.GUID = item.Descendants("guid").FirstOrDefault().Value;
msg.Message = item.Descendants("title").FirstOrDefault().Value;
msg.Time = DateTime.Parse(item.Descendants("pubDate").FirstOrDefault().Value);
msgList.Add(msg);
}
}catch{ }
return msgList;
}
/**////
/// 默认构造函数
///
public FanfouMessage()
{
this.GUID = Guid.NewGuid().ToString();
this.Message = "欢迎使用Windie Chai设计的Silverlight饭否Show。";
this.Time = DateTime.Now;
}
}
}
using System;
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.IO;
using System.Linq;
using System.Xml;
using System.Xml.Linq;
using System.Collections.Generic;
namespace SilverlightFanShow
{
/**////
/// 饭否用户
///
public class FanfouUser
{
/**////
/// 用户头像的URL
///
public Uri ImageURL{get;set;}
/**////
/// 用户的显示名称
///
public string Name{get;set;}
/**////
/// 用户的饭否链接地址
///
public Uri URL{get;set;}
/**////
/// 从Stream加载饭否用户实例
///
///
///
public static FanfouUser Load(Stream stream)
{
FanfouUser user = new FanfouUser();
try
{
XmlReader reader = XmlReader.Create(stream);
XElement doc = XElement.Load(reader);
user.ImageURL = new Uri(doc.Descendants("profile_image_url").FirstOrDefault().Value);
user.Name = doc.Descendants("name").FirstOrDefault().Value;
user.URL = new Uri(doc.Descendants("url").FirstOrDefault().Value);
}
catch { }
return user;
}
/**////
/// 默认构造函数
///
public FanfouUser()
{
this.ImageURL = new Uri("http://avatar.fanfou.com/s0/00/4q/py.jpg?1183096447");
this.Name = "Windie";
this.URL = new Uri("http://fanfou.com/笑煞天");
}
}
/**////
/// 饭否消息
///
public class FanfouMessage
{
/**////
/// 饭否消息的GUID(注:并不是.NET里的GUID)
///
public string GUID { get; set; }
/**////
/// 饭否消息本体
///
public string Message { get; set; }
/**////
/// 饭否消息的发布时间
///
public DateTime Time { get; set; }
/**////
/// 从Stream加载饭否消息列表
///
///
///
public static List<FanfouMessage> Load(Stream stream)
{
List<FanfouMessage> msgList = new List<FanfouMessage>();
try
{
XmlReader reader = XmlReader.Create(stream);
XElement doc = XElement.Load(reader);
IEnumerable<XElement> msgs = from item in doc.Descendants("item")
select item;
foreach (XElement item in msgs)
{
FanfouMessage msg = new FanfouMessage();
msg.GUID = item.Descendants("guid").FirstOrDefault().Value;
msg.Message = item.Descendants("title").FirstOrDefault().Value;
msg.Time = DateTime.Parse(item.Descendants("pubDate").FirstOrDefault().Value);
msgList.Add(msg);
}
}catch{ }
return msgList;
}
/**////
/// 默认构造函数
///
public FanfouMessage()
{
this.GUID = Guid.NewGuid().ToString();
this.Message = "欢迎使用Windie Chai设计的Silverlight饭否Show。";
this.Time = DateTime.Now;
}
}
}
传入参数
其实我设计这个饭否Show并不是只为了给我一个人使用,那么如何让每位朋友都可以把它变成自己的饭否Show呢?那么必然要使Silverlight能够接受参数。
在做Flash开发时,可以在HTML中通过Object的“FlashVars”参数来向Flash传递参数列表,在Silverlight中我们同样可以这样做。
通过给“ InitParams”参数赋值,我们就可以向Silverlight传递参数了。
给“ InitParams”参数赋值的方法如下:
Silverlight的HTML代码块
<object type="application/x-silverlight-2-b1" height="140" width="160" data="data:application/x-oleobject;base64,QfXq3+HzJEysrJnDBxUISgAIAACJEAAAeA4AABAAAAAjAEYARgBGAEYARgBGAAAAAAAAAAAAAAB4AAAAaAB0AHQAcAA6AC8ALwBmAGkAbABlAHMALgBjAG4AYgBsAG8AZwBzAC4AYwBvAG0ALwB4AGkAYQBvAHMAaABhAHQAaQBhAG4ALwBzAGkAbAB2AGUAcgBsAGkAZwBoAHQAZgBhAG4AcwBoAG8AdwAuAHgAYQBwAAAAPAAAAAAAAAAmAAAAbwBuAFMAaQBsAHYAZQByAGwAaQBnAGgAdABFAHIAcgBvAHIAAAAAAAAAAAAAAAAAAAAOAAAASQBEAD0AEXtecSlZAAAAAAAAAQAAAAAAAAAAAAAAAAAAAA==">
<param name="source" value="http://files.cnblogs.com/xiaoshatian/silverlightfanshow.xap"/>
<param name="onerror" value="onSilverlightError"/>
<param name="background" value="#FFFFFF"/>
<param name="InitParams" value="ID=笑煞天"/>
<param name="EnableHtmlAccess" value="true" />
<a href="http://go.microsoft.com/fwlink/?LinkID=108182" style="text-decoration: none;">
<img src="http://go.microsoft.com/fwlink/?LinkId=108181" alt="Get Microsoft Silverlight" style="border-style: none"/>
a>object>
<object type="application/x-silverlight-2-b1" height="140" width="160" data="data:application/x-oleobject;base64,QfXq3+HzJEysrJnDBxUISgAIAACJEAAAeA4AABAAAAAjAEYARgBGAEYARgBGAAAAAAAAAAAAAAB4AAAAaAB0AHQAcAA6AC8ALwBmAGkAbABlAHMALgBjAG4AYgBsAG8AZwBzAC4AYwBvAG0ALwB4AGkAYQBvAHMAaABhAHQAaQBhAG4ALwBzAGkAbAB2AGUAcgBsAGkAZwBoAHQAZgBhAG4AcwBoAG8AdwAuAHgAYQBwAAAAPAAAAAAAAAAmAAAAbwBuAFMAaQBsAHYAZQByAGwAaQBnAGgAdABFAHIAcgBvAHIAAAAAAAAAAAAAAAAAAAAOAAAASQBEAD0AEXtecSlZAAAAAAAAAQAAAAAAAAAAAAAAAAAAAA==">
<param name="source" value="http://files.cnblogs.com/xiaoshatian/silverlightfanshow.xap"/>
<param name="onerror" value="onSilverlightError"/>
<param name="background" value="#FFFFFF"/>
<param name="InitParams" value="ID=笑煞天"/>
<param name="EnableHtmlAccess" value="true" />
<a href="http://go.microsoft.com/fwlink/?LinkID=108182" style="text-decoration: none;">
<img src="http://go.microsoft.com/fwlink/?LinkId=108181" alt="Get Microsoft Silverlight" style="border-style: none"/>
a>object>
仅仅把ID参数传入到Silverlight中是不够的,我们还需要在Silverlight中接收这个参数,并做进一步处理。
我们打开Silverlight项目中的App.xaml,为其Application_Startup事件添加如下代码:
Application_Startup
private void Application_Startup(object sender, StartupEventArgs e)
{
string id = "笑煞天";
if(e.InitParams.Keys.Contains("ID"))
id = e.InitParams["ID"];
this.RootVisual = new Page(id);
}
要注意的是Page默认并没有带有一个String参数的构造函数,所以我们接下来还需要为Page类添加这一构造函数重载。
private void Application_Startup(object sender, StartupEventArgs e)
{
string id = "笑煞天";
if(e.InitParams.Keys.Contains("ID"))
id = e.InitParams["ID"];
this.RootVisual = new Page(id);
}
Page.xaml.cs
最后,我们开始编写最关键的代码。我将在Page.xaml.cs中添加方法或事件来调用饭否API、获取用户的信息和消息列表、实现上一条下一条的跳转等。具体的代码并不难以理解,不再详细解释,大家看注释便好:
Page.xaml.cs代码
using System;
using System.Collections.Generic;
using System.Linq;
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.Net;
using System.IO;
using System.Xml;
using System.Xml.Linq;
using System.Threading;
using System.Windows.Browser;
namespace SilverlightFanShow
{
public partial class Page : UserControl
{
//饭否用户ID
private string userID;
//饭否用户
private FanfouUser user;
//当前消息
private FanfouMessage currentMessage;
//消息列表
private List<FanfouMessage> messageList;
public Page(string id)
{
this.userID = id;
InitializeComponent();
}
/**////
/// 布局加载事件
///
///
///
private void LayoutRoot_Loaded(object sender, RoutedEventArgs e)
{
//加载用户信息
Uri userUrl = new Uri("http://api.fanfou.com/users/show/"
+ this.userID
+ ".xml");
WebRequest userRequest = WebRequest.Create(userUrl);
userRequest.BeginGetResponse(new AsyncCallback(GetUserInfo), userRequest);
//加载用户消息
Uri msgUrl = new Uri("http://api.fanfou.com/statuses/user_timeline/"
+ this.userID
+ ".rss");
WebRequest msgRequest = WebRequest.Create(msgUrl);
msgRequest.BeginGetResponse(new AsyncCallback(GetMessages), msgRequest);
}
/**////
/// 获取用户信息
///
///
void GetUserInfo(IAsyncResult asyncResult)
{
WebRequest request = asyncResult.AsyncState as WebRequest;
WebResponse response= request.EndGetResponse(asyncResult);
Stream stream = response.GetResponseStream();
user = FanfouUser.Load(stream);
//反映到UI
this.pic.SetValue(Image.SourceProperty, user.ImageURL);
this.userName.Text = user.Name;
}
/**////
/// 获取用户消息
///
///
void GetMessages(IAsyncResult asyncResult)
{
WebRequest request = asyncResult.AsyncState as WebRequest;
WebResponse response = request.EndGetResponse(asyncResult);
Stream stream = response.GetResponseStream();
messageList = FanfouMessage.Load(stream);
//反映到UI
if(messageList.Count > 1)
this.SetMessage(messageList[0]);
}
/**////
/// 设置当前消息
///
///
private void SetMessage(FanfouMessage message)
{
//去掉消息正文前边的用户名
string msg = message.Message.Substring(message.Message.IndexOf(':') + 1);
//如果消息正文过长,截短之
if (msg.Length > 50)
msg = msg.Substring(0, 50) + "";
this.txt.Text = msg;
this.time.Text = message.Time.ToShortDateString();
this.currentMessage = message;
}
/**////
/// 下一条消息按钮按下事件
///
///
///
private void btnNext_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
int msgIndex = messageList.IndexOf(currentMessage);
if (msgIndex + 1 < messageList.Count)
SetMessage(messageList[msgIndex + 1]);
else if(messageList.Count > 0)
SetMessage(messageList[0]);
}
/**////
/// 下一条消息按钮按下事件
///
///
///
private void btnPrev_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
int msgIndex = messageList.IndexOf(currentMessage);
if (msgIndex > 0)
SetMessage(messageList[msgIndex - 1]);
else if (messageList.Count > 0)
SetMessage(messageList[messageList.Count - 1]);
}
/**////
/// 头像点击事件
///
///
///
private void goToFanfou(object sender, MouseButtonEventArgs e)
{
//打开用户的饭否页面
HtmlPage.Window.Navigate(this.user.URL, "_blank");
}
}
}
using System;
using System.Collections.Generic;
using System.Linq;
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.Net;
using System.IO;
using System.Xml;
using System.Xml.Linq;
using System.Threading;
using System.Windows.Browser;
namespace SilverlightFanShow
{
public partial class Page : UserControl
{
//饭否用户ID
private string userID;
//饭否用户
private FanfouUser user;
//当前消息
private FanfouMessage currentMessage;
//消息列表
private List<FanfouMessage> messageList;
public Page(string id)
{
this.userID = id;
InitializeComponent();
}
/**////
/// 布局加载事件
///
///
///
private void LayoutRoot_Loaded(object sender, RoutedEventArgs e)
{
//加载用户信息
Uri userUrl = new Uri("http://api.fanfou.com/users/show/"
+ this.userID
+ ".xml");
WebRequest userRequest = WebRequest.Create(userUrl);
userRequest.BeginGetResponse(new AsyncCallback(GetUserInfo), userRequest);
//加载用户消息
Uri msgUrl = new Uri("http://api.fanfou.com/statuses/user_timeline/"
+ this.userID
+ ".rss");
WebRequest msgRequest = WebRequest.Create(msgUrl);
msgRequest.BeginGetResponse(new AsyncCallback(GetMessages), msgRequest);
}
/**////
/// 获取用户信息
///
///
void GetUserInfo(IAsyncResult asyncResult)
{
WebRequest request = asyncResult.AsyncState as WebRequest;
WebResponse response= request.EndGetResponse(asyncResult);
Stream stream = response.GetResponseStream();
user = FanfouUser.Load(stream);
//反映到UI
this.pic.SetValue(Image.SourceProperty, user.ImageURL);
this.userName.Text = user.Name;
}
/**////
/// 获取用户消息
///
///
void GetMessages(IAsyncResult asyncResult)
{
WebRequest request = asyncResult.AsyncState as WebRequest;
WebResponse response = request.EndGetResponse(asyncResult);
Stream stream = response.GetResponseStream();
messageList = FanfouMessage.Load(stream);
//反映到UI
if(messageList.Count > 1)
this.SetMessage(messageList[0]);
}
/**////
/// 设置当前消息
///
///
private void SetMessage(FanfouMessage message)
{
//去掉消息正文前边的用户名
string msg = message.Message.Substring(message.Message.IndexOf(':') + 1);
//如果消息正文过长,截短之
if (msg.Length > 50)
msg = msg.Substring(0, 50) + "";
this.txt.Text = msg;
this.time.Text = message.Time.ToShortDateString();
this.currentMessage = message;
}
/**////
/// 下一条消息按钮按下事件
///
///
///
private void btnNext_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
int msgIndex = messageList.IndexOf(currentMessage);
if (msgIndex + 1 < messageList.Count)
SetMessage(messageList[msgIndex + 1]);
else if(messageList.Count > 0)
SetMessage(messageList[0]);
}
/**////
/// 下一条消息按钮按下事件
///
///
///
private void btnPrev_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
int msgIndex = messageList.IndexOf(currentMessage);
if (msgIndex > 0)
SetMessage(messageList[msgIndex - 1]);
else if (messageList.Count > 0)
SetMessage(messageList[messageList.Count - 1]);
}
/**////
/// 头像点击事件
///
///
///
private void goToFanfou(object sender, MouseButtonEventArgs e)
{
//打开用户的饭否页面
HtmlPage.Window.Navigate(this.user.URL, "_blank");
}
}
}
预览
如果你也想要在你的blog中添加这个Widget,那么,Copy上面的HTML代码,修改ID就可以了。