这是用.net2.0开发的一个基于ExtSJ技术实现的简单blog系统，演示了ExtJS的综合应用。
　　系统后台使用.Net平台，语言为C#，技术构架为NHibernate+Spring.Net+Vifir实现，支持多种数据库，采用三层结构，数据访问层DAO、业务逻辑层及表示层完全分离。DAO层使用的泛型DAO，只需要一个DAO接口即可，不需要写具体的实现。
　　系统演示：
　　系统下载地址： [url]http://www.vifir.com/download/extblog-net.zip[/url]
　　下面是系统后台的截图
　　
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　　 系统中的一些源码摘要：
域模型：
namespace Vifir.Model.Domain
{
   public class Topic
    {
        private long id;
        
        private string title;      

        private string content;
        
        private string intro;       

        private TopicCategory category;       

        private IList<TopicComment> comments = new List<TopicComment>();

       private DateTime inputTime = DateTime.Now;
       
        private int readTimes = 0;
       public virtual long Id
        {
            get { return id; }
            set { id = value; }
        }
       public virtual string Title
        {
            get { return title; }
            set { title = value; }
        }
       public virtual string Content
        {
            get { return content; }
            set { content = value; }
        }
       public virtual string Intro
        {
            get { return intro; }
            set { intro = value; }
        }
       public virtual TopicCategory Category
        {
            get { return category; }
            set { category = value; }
        }
       public virtual IList<TopicComment> Comments
        {
            get { return comments; }
            set { comments = value; }
        }
       public virtual DateTime InputTime
        {
            get { return inputTime; }
            set { inputTime = value; }
        }
       public virtual int ReadTimes
        {
            get { return readTimes; }
            set { readTimes = value; }
        }
    }
}

DAO接口
namespace Vifir.Model.DAO
{
    public interface ITopicDAO : GenericDAO
    {
    }
}
泛型DAO配置　
< object  id = " TopicDao "  parent = " abstractDao " >      < property name = " proxyInterfaces "
 value = " Vifir.Model.DAO.ITopicDAO " />      < property name = " target " >      
  < object  parent = " baseDAO "  type = " Vifir.Core.GenericDAOImpl<Vifir.Model.Domain.Topic>,Vifir.Core "   />     
property >    object >
TopicService业务层实现代码
namespace Vifir.Model.Service.Impl
{
    public class TopicServiceImpl:ITopicService
    {
            private ITopicDAO topicDao;

    public ITopicDAO TopicDao
    {
      set { topicDao = value; }
    }
    

    public long addTopic(Topic topic) {    
        this.topicDao.Save(topic);
        return topic.Id;
    }
    
    public Topic getTopic(long id) {
        Topic topic = this.topicDao.Get(id);
        return topic;
        }
    
    public bool delTopic(long id) {    
            Topic topic = this.getTopic(id);
            if(topic.Comments.Count>0)throw new LogicException("该文章下还有评论，不能删除！");
            if (topic != null) {
                this.topicDao.Remove(id);
                return true;
            }            
            return false;    
    }
    
    
    public IPageList getTopicBy(IQueryObject queryObject) {    
        return QueryUtil.query(queryObject, typeof(Topic),this.topicDao);        
    }
    
    public bool updateTopic(long id, Topic topic) {
        if (id != default(long))
        {
            topic.Id=id;
        } else {
            return false;
        }
        this.topicDao.Update(topic);
        return true;
    }    
    }
}

Web层的添删改查代码：public partial class manage_Topic : BaseAction
{
    private ITopicService service;   
    private ITopicCategoryService categoryService;
    public ITopicService Service
    {
        set { service = value; }
    }
    public ITopicCategoryService CategoryService
    {  
        set { categoryService = value; }
    }

    public void List()
    {
        QueryObject qo = new QueryObject();
        ToPo(qo);
        string categoryId = Request.Params["categoryId"];
        if (categoryId != null && !"".Equals(categoryId))
        {
            qo.addQuery("obj.Category.id", long.Parse(categoryId), "=");
        }
        IPageList pageList = service.getTopicBy(qo);
        jsonResult = pageList;
    }

    public void Remove()
    {
        long id = long.Parse(Request.Params["id"]);
        service.delTopic(id);
        jsonResult = true;
    }

    public void Save()
    {
       Topic obj = new Topic();
       ToPo(obj);
       string CategoryId = Request.Params["CategoryId"];
       if (CategoryId != null && !"".Equals(CategoryId))
       {
         TopicCategory c = this.categoryService.getTopicCategory(long.Parse(CategoryId));
         obj.Category = c;
       }
       if (!HasError())
       service.addTopic(obj);
       extFormResult = true;
    }

    public void Update()
    {
        long id = long.Parse(Request.Params["id"]);
        Topic obj = service.getTopic(id);
        ToPo(obj);
        string CategoryId = Request.Params["CategoryId"];
        if (CategoryId != null && !"".Equals(CategoryId))
        {
            TopicCategory c = this.categoryService.getTopicCategory(long.Parse(CategoryId));
            obj.Category = c;
        }
        if (!HasError())
            service.updateTopic(id, obj);
        extFormResult = true;
    }
}