对于CS的分析你可以能会从页面开始，其实那并不是一个很好的方法，因为CS采用了MasterPage和内建的Theme与Skins，页面一层嵌套一层，如果你对CS页面执行机制不了解，或者你是初学者，这个时候可能就会碰壁，接着就放弃了对CS更深入的了解。我希望我的专题能从CS的运行过程开始一步一步地讲解，同时把ASP.NET的运行机理也表述出来，因此学习了解CS的过程就是对ASP.NET深入了解得过程。当然，我个人的开发经验与水平也是有限的，如果在专题中表述有问题，或者有疑问可以直接在文章的评论中直接指出，我将万分感谢你。
在分析CSHttpModule.cs的时候，你会看到这样两句代码：
CSEvents.UserKnown(csContext.User);
CSEvents.CSException(csException);
其实短短两行代码后面隐藏了Delegates与Events的大量运用，CS也通过这样的运用实现了一种模块化的处理机制，即CSModules。
打开CommunityServerWeb项目下的communityserver.config文件，这是CS的配置文件(与Web.config不同，communityserver.config主要配置的是CS内部的一些运行机制，而Web.config主要配置的是与Asp.net的交互)。找到文件中的这段：
<CSModules>
<add name = "CSMembershipRulesModule" type = "CommunityServer.Components.CSMembershipRulesModule, CommunityServer.Components" />
<add name = "CSCatastrophicExceptionModule" type = "CommunityServer.Components.CSCatastrophicExceptionModule, CommunityServer.Components" />
<add name = "CSExceptionModule" type = "CommunityServer.Components.CSExceptionModule, CommunityServer.Components" />
<add name = "IrcCommands" type = "CommunityServer.Discussions.Components.IrcCommandsModule, CommunityServer.Discussions" />
<add name = "ForumCensorship" type = "CommunityServer.Discussions.Components.CensorshipModule, CommunityServer.Discussions" />
<add name = "ForumEmoticon" type = "CommunityServer.Discussions.Components.EmoticonModule, CommunityServer.Discussions" />
<add name = "ForumSourceCode" type = "CommunityServer.Discussions.Components.SourceCodeModule, CommunityServer.Discussions" />
<add name = "ForumHtmlScrubbing" type = "CommunityServer.Discussions.Components.HtmlScrubbingModule, CommunityServer.Discussions" />
<add name = "BBcodeToHtml" type = "CommunityServer.Discussions.Components.BBcodeToHtmlModule, CommunityServer.Discussions" />
<add name = "ForumPlainText" type = "CommunityServer.Discussions.Components.PlainTextModule, CommunityServer.Discussions" />
<add name = "WeblogCensorModule" type = "CommunityServer.Blogs.Components.CensorModule, CommunityServer.Blogs" />
<add name = "WeblogPostandArticleHtmlScrubbing" type = "CommunityServer.Blogs.Components.PostandArticleHtmlScrubbing, CommunityServer.Blogs" />
<add name = "WeblogFeedbackHtmlFormatting" type = "CommunityServer.Blogs.Components.FeedbackHtmlFormatting, CommunityServer.Blogs" />
<add name = "TrackbackModule" type = "CommunityServer.Blogs.Components.TrackbackModule, CommunityServer.Blogs" />
<add name = "XmlRpcPingModule" type = "CommunityServer.Blogs.Components.XmlRpcPingModule, CommunityServer.Blogs" />
<add name = "WeblogFormattingModule" type = "CommunityServer.Blogs.Components.WeblogFormattingModule, CommunityServer.Blogs" />
<add name = "PictureCensor" type = "CommunityServer.Galleries.Components.CensorPictureModule, CommunityServer.Galleries" />
<add name = "PictureHtmlScrubber" type = "CommunityServer.Galleries.Components.HtmlScrubberModule, CommunityServer.Galleries" />
<add name = "PictureComments" type = "CommunityServer.Galleries.Components.CommentModule, CommunityServer.Galleries" />
<!-- <add name = "MaxPictureSize" type = "CommunityServer.Galleries.Components.MaxPictureSizeModule, CommunityServer.Galleries" maxWidth="1024" maxHeight="768" quality="90" /> -->
</CSModules>
我们拿出其中的一个来分析运行过程，例：
<add name = "CSExceptionModule" type = "CommunityServer.Components.CSExceptionModule, CommunityServer.Components" />
这是CS中异常处理的模块，当发生异常的时候该模块将调用一个RedirectToMessage方法，提示一个友好的错误界面，告诉请求的用户有错误发生。那么CS系统是如何在发生错误的时候自动调用RedirectToMessage方法转向另外一个页面提示友好错误的呢？先打开CommunityServerComponents项目下Components文件夹中的CSApplication.cs
using System;
using System.Collections;
using System.ComponentModel;
using System.Web.Caching;
using System.Xml;
using CommunityServer.Configuration;
namespace CommunityServer.Components
{
Delegates#region Delegates
//Do we want one single delegate or a custom one for each type
//public delegate void CSEventHandler(object sender, CSEventArgs e);
public delegate void CSUserEventHandler(User user, CSEventArgs e);
public delegate void CSPostEventHandler(Post post, CSEventArgs e);
public delegate void CSSectionEventHandler(Section section, CSEventArgs e);
public delegate void CSGroupEventHandler(Group group, CSEventArgs e);
public delegate void CSExceptionHandler(CSException csEx, CSEventArgs e);
#endregion
/**//// <summary>
/// Summary description for CSApplication.
/// </summary>
public class CSApplication
{
private members#region private members
private EventHandlerList Events = new EventHandlerList();
private static readonly object sync = new object();
private Hashtable modules = new Hashtable();
#endregion
Event Keys (static)#region Event Keys (static)
private static object EventAuthorizePost = new object();
private static object EventPrePostUpdate = new object();
private static object EventPreProcessPost = new object();
private static object EventPostPostUpdate = new object();
private static object EventRatePost = new object();
//private static object EventPreRenderPost = new object();
private static object EventPreUserUpdate
