最近无事写了一个HttpModule的抽象基类,从这个类继承的HttpModule就能直接对Page对象进行操作,只需要重写OnPrePageExecute方法,然后向该类提供的Page属性注册事件或者修改属性即可。
使用HttpModule是比页面基类更好的方法,更加灵活方便。
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/// <summary>
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/// 控制aspx页面的HttpModule通用基类
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/// </summary>
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public abstract class PageModule : IHttpModule
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{
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private HttpApplication _application;
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/// <summary>
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/// 销毁PageModule实例。
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/// </summary>
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public void Dispose()
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{
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}
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/// <summary>
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/// 实现IHttpModule,初始化PageModule
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/// </summary>
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/// <param name="context">HttpApplication实例</param>
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public void Init( HttpApplication context )
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{
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_application = context;
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//_application.PostMapRequestHandler += new EventHandler( OnPostMapRequestHandler );
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_application.PreRequestHandlerExecute += new EventHandler( OnPreRequestHandlerExecute );
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_application.PostRequestHandlerExecute += new EventHandler( OnPostRequestHandlerExecute );
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}
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private void OnPreRequestHandlerExecute( object sender, EventArgs e )
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{
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_page = Context.Handler as System.Web.UI.Page;
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if ( _page != null )
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OnPrePageExecute( sender, e );
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}
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/// <summary>
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/// 当执行页面处理程序之前发生
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/// </summary>
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/// <param name="sender">事件源</param>
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/// <param name="e">事件参数</param>
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protected virtual void OnPrePageExecute( object sender, EventArgs e )
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{
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}
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private void OnPostRequestHandlerExecute( object sender, EventArgs e )
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{
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if ( _page != null )
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OnPostPageExecute( sender, e );
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}
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/// <summary>
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/// 当执行页面处理程序执行完毕时发生
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/// </summary>
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/// <param name="sender">事件源</param>
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/// <param name="e">事件参数</param>
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protected virtual void OnPostPageExecute( object sender, EventArgs e )
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{
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}
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private System.Web.UI.Page _page;
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/// <summary>
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/// 获取当前请求的页面对象
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/// </summary>
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protected System.Web.UI.Page Page
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{
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get { return _page; }
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}
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/// <summary>
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/// 获取当前的请求的Http上下文信息
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/// </summary>
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protected HttpContext Context
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{
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get { return _application.Context; }
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}
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/// <summary>
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/// 获取模块所在的HttpApplication实例
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/// </summary>
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protected HttpApplication ApplicationInstanse
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{
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get { return _application; }
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}
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}
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