利用 httpmodule 强制所有页面使用同一基类

public class OMSPageChecker : IHttpModule
    {
        public void Dispose()
        {

        }

        public void Init(HttpApplication context)
        {
            context.PreRequestHandlerExecute += new EventHandler(context_PreRequestHandlerExecute);
        }

        void context_PreRequestHandlerExecute(object sender, EventArgs e)
        {
            var app = sender as HttpApplication;
            if (app == null)
                return;

            var page = app.Context.Handler as System.Web.UI.Page;
            if (page == null)
                return;

            if (page is BasePage)
                return;

            if (page is Firstelite.OMS.Redirect)
                return;

            if (page is FirsteLite.OMS.Checking.NewMarking)
                return;

            app.CompleteRequest();
            app.Context.Response.Write("前端页面必须继承自 BasePage ！");
        }
    }

<httpModules>
      <add name="OMSPageChecker" type="OMS.OMSPageChecker, OMS"/>
    </httpModules>