placardlogic.cs

前台：asp.net；后台: sql server 一个功能完善的BBS系统源码。

using System;
using Stella.Model;
using Stella.Utility;
using Stella.SQLServerDAL;

namespace Stella.BusinessLogic
{
	/// <summary>
	///  对通告的操作
	/// </summary>
	public class PlacardLogic
	{
		/// <summary>
		/// 构造函数
		/// </summary>
		/// <param name="handler">订阅事件方提供得委托</param>
		/// <remarks>
		/// 接受的委托方法提供使缓存失效的功能
		/// </remarks>
		public PlacardLogic(DBChangedEventHandler handler)
		{
			DBChanged+=handler;
		}

		/// <summary>
		/// 构造函数
		/// </summary>
		public PlacardLogic()
		{
		}

		/// <summary>
		/// 数据库改变事件
		/// </summary>
		/// <remarks>
		/// 若此事件发布，则说明数据库已经改变，需要重新缓存数据
		/// </remarks>
		public event DBChangedEventHandler DBChanged;

		/// <summary>
		/// 创建新通告
		/// </summary>
		/// <param name="placard">新通告</param>
		public void Create(Placard placard)
		{
			DebugHelper.CheckCondition(DBChanged!=null,"没有任何类订阅监视数据库改变的DBChanged事件！");
			PlacardAccess pa=new PlacardAccess();
			pa.Create(placard);
			
			DBChanged();
		}

		/// <summary>
		/// 获取通告信息
		/// </summary>
		/// <param name="id">通告的编号</param>
		public Placard GetInfo(int id)
		{
			PlacardAccess pa=new PlacardAccess();
			return pa.GetInfo(id);
		}

		/// <summary>
		/// 更新通告
		/// </summary>
		/// <param name="placard">新通告</param>
		public void Update(Placard placard)
		{
			DebugHelper.CheckCondition(DBChanged!=null,"没有任何类订阅监视数据库改变的DBChanged事件！");
			PlacardAccess pa=new PlacardAccess();
			pa.Update(placard);
			
			DBChanged();
		}

		/// <summary>
		/// 删除通告
		/// </summary>
		/// <param name="id">通告的编号</param>
		public void Remove(int id)
		{
			DebugHelper.CheckCondition(DBChanged!=null,"没有任何类订阅监视数据库改变的DBChanged事件！");
			PlacardAccess pa=new PlacardAccess();
			pa.Remove(id);
			DBChanged();
		}

		/// <summary>
		/// 获得通告列表
		/// </summary>
		/// <param name="placards">要填充的通告列表</param>
		public void FillList(PlacardList placards)
		{
			PlacardAccess pa=new PlacardAccess();
			pa.FillList(placards);
		}
	}
}