asp.net 不用组件的URL重写(适用于较大型项目)

{
//开始替换成我们程序能读懂的url
string newUrl = Regex.Replace(requestPath.Substring(context.Request.Path.LastIndexOf("/")),
url.Pattern, url.QueryString, RegexOptions.None | RegexOptions.IgnoreCase);
//这里你可以输出一下看看
//context.Response.Write(url.Page + "<br>" + newUrl+"<br>");
//开始把用户便于记忆的URL替换成程序能读懂的url
context.RewritePath(url.Page, string.Empty, newUrl);
}
}
}
}
public class SiteUrls
{
//定义成volatitle类型主要是为了多线程访问方便,在这个示例程序中没什么实际意义，项目大了就有用了
private static volatile SiteUrls instance = null;
string UrlsFile = HttpContext.Current.Server.MapPath("/config/urls.config");
//定义两个属性
private System.Collections.ArrayList _Urls;
public System.Collections.ArrayList Urls
{
get { return _Urls; }
set { _Urls = value; }
}
//这个就是个键植对 表害怕一点也不高深
private System.Collections.Specialized.NameValueCollection _Paths;
public System.Collections.Specialized.NameValueCollection Paths
{
get { return _Paths; }
set { _Paths = value; }
}
//构造函数
private SiteUrls()
{
Urls = new System.Collections.ArrayList();
Paths = new System.Collections.Specialized.NameValueCollection();
//以XML个数读取那CONFIG文件
XmlDocument urlconfig = new XmlDocument();
urlconfig.Load(UrlsFile);
XmlNode root = urlconfig.SelectSingleNode("urls");
foreach (XmlNode n in root.ChildNodes)
{
//XmlNodeType.Comment如果不是注释
if (n.NodeType != XmlNodeType.Comment && n.Name.ToLower() == "rewrite")
{
XmlAttribute name = n.Attributes["name"];
XmlAttribute path = n.Attributes["path"];
XmlAttribute page = n.Attributes["page"];
XmlAttribute querystring = n.Attributes["querystring"];
XmlAttribute pattern = n.Attributes["pattern"];

if (name != null && path != null && page != null
&& querystring != null && pattern != null)
{
Paths.Add(name.Value, path.Value);
//压进去的都是url实体类
Urls.Add(new URLRewrite(name.Value, pattern.Value, page.Value.Replace("^", "&"),
querystring.Value.Replace("^", "&")));
}
}
}
}
//用方法实例化
public static SiteUrls GetSiteUrls()
{
if (instance == null)
{
instance = new SiteUrls();
}
return instance;
}

#region url实体类
public class URLRewrite
{
#region 成员变量
private string _Name;
public string Name
{
get { return _Name; }
set { _Name = value; }
}

private string _Pattern;
public string Pattern
{
get { return _Pattern; }
set { _Pattern = value; }
}

private string _Page;
public string Page
{
get { return _Page; }
set { _Page = value; }
}

private string _QueryString;
public string QueryString
{
get { return _QueryString; }