做silvelight也有一段时间了，相册、游戏，刚刚完成的showcase这个小程序算是一个阶段了。这里就以showcase这个项目来做一下CaseStudy。
数据篇-从XML中获取数据
这个项目我的后台用的是asp.net开发。由于规模比较小我的数据层用的是subsonic。用它来做开发会比较敏捷。
这一回我选择的数据方式是asp.net生成xml，用silverlight中的Linq来实例化成具体的类。
这里我以读取类别信息为例子，分为3步：
- 定义xml
定义实体类<? xml version="1.0" encoding="utf-8" ?>
< categories >
< category >< cid > 2 </ cid >< title > Dumex </ title ></ category >
< category >< cid > 1 </ cid >< title > MySVW </ title ></ category >
< category >< cid > 3 </ cid >< title > Microsoft </ title ></ category >
</ categories >
用linq读取public class Category
{
public int cid { get ; set ; }
public string title { get ; set ; }
}
WebClient client = new WebClient();
client.DownloadStringAsync( new Uri(HtmlPage.Document.DocumentUri, " category.ashx " ));
client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(client_DownloadStringCompleted);
void client_DownloadStringCompleted( object sender, DownloadStringCompletedEventArgs e)
{
XmlReader reader = XmlReader.Create( new StringReader(e.Result));
XDocument document = XDocument.Load(reader);
var categories = from c in document.Descendants( " category " )
select new Category
{
cid = int .Parse(c.Element( " cid " ).Value),
title = c.Element( " title " ).Value
};
// todo
}
在这里我选用了ashx来配合subsonic生成xml文件
<%
@ WebHandler Language
=
"
C#
"
Class
=
"
category
"
%>
using System;
using System.Web;
using System.Text;
public class category : IHttpHandler {
StringBuilder sb = new StringBuilder();
string templateStr = " <category> " +
" <cid>{0}</cid> " +
" <title>{1}</title> " +
" </category> " ;
public void ProcessRequest (HttpContext context) {
context.Response.ContentType = " text/xml " ;
SC.CategoryCollection cc = new SC.CategoryCollection();
SubSonic.Query query = SC.Category.Query().ORDER_BY( " sortid " , " desc " );
cc.LoadAndCloseReader(query.ExecuteReader());
sb.AppendLine( " <?xml version=\ " 1.0 \ " encoding=\ " utf - 8 \ " ?> " );
sb.AppendLine( " <categories> " );
for ( int i = 0 ; i < cc.Count; i ++ ) {
sb.AppendLine( string .Format(templateStr, cc[i].Id, cc[i].Title));
}
sb.AppendLine( " </categories> " );
context.Response.Write(sb.ToString());
}
public bool IsReusable {
get {
return false ;
}
}
}
using System;
using System.Web;
using System.Text;
public class category : IHttpHandler {
StringBuilder sb = new StringBuilder();
string templateStr = " <category> " +
" <cid>{0}</cid> " +
" <title>{1}</title> " +
" </category> " ;
public void ProcessRequest (HttpContext context) {
context.Response.ContentType = " text/xml " ;
SC.CategoryCollection cc = new SC.CategoryCollection();
SubSonic.Query query = SC.Category.Query().ORDER_BY( " sortid " , " desc " );
cc.LoadAndCloseReader(query.ExecuteReader());
sb.AppendLine( " <?xml version=\ " 1.0 \ " encoding=\ " utf - 8 \ " ?> " );
sb.AppendLine( " <categories> " );
for ( int i = 0 ; i < cc.Count; i ++ ) {
sb.AppendLine( string .Format(templateStr, cc[i].Id, cc[i].Title));
}
sb.AppendLine( " </categories> " );
context.Response.Write(sb.ToString());
}
public bool IsReusable {
get {
return false ;
}
}
}
作者：nasa
出处：nasa.cnblogs.com
联系:nasa_wz@hotmail.com
QQ:12446006
