1、Session
2、验证码
YZM.ashx
<%@ WebHandler Language="C#" Class="YZM" %> using System; using System.Web; public class YZM : IHttpHandler, System.Web.SessionState.IRequiresSessionState { public void ProcessRequest (HttpContext context) { context.Response.ContentType = "image/JPEG"; using (System.Drawing.Bitmap bitImage = new System.Drawing.Bitmap(130, 100)) { //设置画布 using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitImage)) { //随机数字 Random my_random = new Random(); int num_01 = my_random.Next(100); int num_02 = my_random.Next(100); int result = num_01 + num_02; string num_string01 = num_01.ToString(); string num_string02 = num_02.ToString(); string result_string = result.ToString(); //保存到服务器的sessionid中 HttpContext.Current.Session["YZM"] = result_string; //设置文字 g.DrawString(num_string01 +"+"+ num_string02+"?", new System.Drawing.Font("宋体", 20), System.Drawing.Brushes.Red, new System.Drawing.PointF(0, 0)); //保存到输出流中 bitImage.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg); } } } public bool IsReusable { get { return false; } } }
YZM.aspx
<form id="form1" runat="server"> <div> <%--单击刷新验证码--%> <img src="YZM.ashx" alt="请输入验证码" onclick="this.src='YZM.ashx?aaa='+new Date()" /> </div> <asp:TextBox ID="TextBox1" runat="server" text=""></asp:TextBox> <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" /> </form>
3、http协议
4、按钮实现标哥行删除效果 超链接提交表单
5、web开发原则
6、XSS漏洞
label类似控件:Literal控件,如果 属性中text的值为<a href="www.baidu.com">hah</a>可以会被嵌入链接,
可以设置mode属性为Encode
7、虚拟目录~ :ASP.net中使用,始终在应用程序根目录下开始