本文实例为大家分享了ASP.NET生成验证码的具体代码，供大家参考，具体内容如下
首先，添加一个一般处理程序
注释很详细了，有不懂的欢迎评论
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using System;using System.Collections.Generic;using System.Drawing;using System.Linq;using System.Web;using System.Web.SessionState;namespace Project_Practice{ /// <summary> /// Handler1 的摘要说明 /// </summary> public class Handler1 : IHttpHandler,IRequiresSessionState { public void ProcessRequest(HttpContext context) { //选取的颜色 Color[] colors = { Color.White }; //通过Bitmap构造Image Image img = new Bitmap(100, 60); //Graphics绘画Image Graphics graphics = Graphics.FromImage(img); Random random = new Random(DateTime.Now.Millisecond); //验证码的四位数 int charNum1 = random.Next('0', '9' + 1); int charNum2 = random.Next('0', '9' + 1); int charNum3 = random.Next('0', '9' + 1); int charNum4 = random.Next('0', '9' + 1); //把生成的随机数变成字符串，通过char进行转换 string validCode = string.Format($"{(char)charNum1}{(char)charNum2}{(char)charNum3}{(char)charNum4}"); //放进Session进行存储，记得继承接口，否则疯狂报空指针 context.Session["verification_Code"] = validCode; //字体的大小和类别 Font font = new Font("宋体", 24); //随机的颜色 Brush brush1 = new SolidBrush(colors[random.Next(0, colors.Length - 1)]); //DrawString的四个参数，第一个是要写的字符，第二个是字体，第三个是颜色，第四个是坐标x,y graphics.DrawString(((char)charNum1).ToString(), font, brush1, 7, -3); Brush brush2 = new SolidBrush(colors[random.Next(0, colors.Length - 1)]); graphics.DrawString(((char)charNum2).ToString(), font, brush2, 26, -9); Brush brush3 = new SolidBrush(colors[random.Next(0, colors.Length - 1)]); graphics.DrawString(((char)charNum3).ToString(), font, brush3, 50, 0); Brush brush4 = new SolidBrush(colors[random.Next(0, colors.Length - 1)]); graphics.DrawString(((char)charNum4).ToString(), font, brush4, 70, -7); //保存，格式 context.Response.ContentType = "image/jpeg"; img.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg); //释放资源 graphics.Dispose(); img.Dispose(); } public bool IsReusable { get { return false; } } }} |
一个web窗体
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<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="verification_Code.aspx.cs" Inherits="Project_Practice.verification_Code" %><!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title></title></head><body> <form id="form1" runat="server"> <div> <asp:Image ID="Image1" runat="server" ImageUrl="~/Handler1.ashx" /> </div> </form></body></html> |
效果图
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/a1439775520/article/details/105785708
