摘要：<%@ WebHandler Language="C#" Class="WaterMark" %>using System;using System.Web;using System.Drawing;using System.Drawing.Drawing2D;using System.Web.SessionState; public class WaterMark : IHttpHandler, IRequiresSessionState // 要使用session必须实现该接口,记得要导入System.Web.SessionState命名 阅读全文