search
HomeBackend DevelopmentC#.Net TutorialASP.NET MVC verification code function implementation code

Front desk

<img src="/static/imghwm/default1.png"  data-src="/Home/VCode"  class="lazy"  id="vcodeimg"     style="max-width:90%"
                                    height="25" />
                                 <span
                                    style="cursor: pointer; text-decoration: underline">换一张</span>

Controller

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Utility;
using Jellal**;
namespace sjlwebsite.Controllers
{
    public class CommonController : Controller
    {
        #region 验证码
        [OutputCache(Duration = 0)]
        public ActionResult VCode()
        {
            string code = ValidateCode.CreateRandomCode(4);
            Session["vcode"] = code;
            ValidateCode.CreateImage(code);
            return View();
        }
        public string GetCode()
        {
            return Session["vcode"].ToStr();
        }
        #endregion
    }
}

Verification code class

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
namespace Utility
{
    ///  <summary>  
    ///  完美随机验证码  0.10  
    ///  Verion:0.10  
    ///  Description:随机生成设定验证码,并随机旋转一定角度,字体颜色不同  
    ///  </summary>  
    public class ValidateCode
    {

        ///  <summary>  
        ///  生成随机码  
        ///  </summary>  
        ///  <param  name="length">随机码个数www.52mvc.com</param>  
        ///  <returns></returns>  
        public static string CreateRandomCode(int length)
        {
            int rand;
            char code;
            string randomcode = String.Empty;
            //生成一定长度的验证码  
            System.Random random = new Random();
            for (int i = 0; i < length; i++)
            {
                rand = random.Next();
                if (rand % 3 == 0)
                {
                    code = (char)(&#39;A&#39; + (char)(rand % 26));
                }
                else
                {
                    code = (char)(&#39;0&#39; + (char)(rand % 10));
                }
                randomcode += code.ToString();
            }
            return randomcode;
        }
        ///  <summary>  
        ///  创建随机码图片  
        ///  </summary>  
        ///  <param  name="randomcode">随机码</param>  
        public static void CreateImage(string randomcode)
        {
            int randAngle = 45; //随机转动角度  
            int mapwidth = (int)(randomcode.Length * 23);
            Bitmap map = new Bitmap(mapwidth, 28);//创建图片背景  
            Graphics graph = Graphics.FromImage(map);
            graph.Clear(Color.AliceBlue);//清除画面,填充背景  
            graph.DrawRectangle(new Pen(Color.Black, 0), 0, 0, map.Width - 1, map.Height - 1);//画一个边框  
            //graph.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;//模式  
            Random rand = new Random();
            //背景噪点生成    www.jb51.net
            Pen blackPen = new Pen(Color.LightGray, 0);
            for (int i = 0; i < 50; i++)
            {
                int x = rand.Next(0, map.Width);
                int y = rand.Next(0, map.Height);
                graph.DrawRectangle(blackPen, x, y, 1, 1);
            }
            //验证码旋转,防止机器识别    
            char[] chars = randomcode.ToCharArray();//拆散字符串成单字符数组  
            //文字距中  
            StringFormat format = new StringFormat(StringFormatFlags.NoClip);
            format.Alignment = StringAlignment.Center;
            format.LineAlignment = StringAlignment.Center;
            //定义颜色  
            Color[] c = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };
            //定义字体  
            string[] font = { "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋体" };
            for (int i = 0; i < chars.Length; i++)
            {
                int cindex = rand.Next(7);
                int findex = rand.Next(5);
                Font f = new System.Drawing.Font(font[findex], 13, System.Drawing.FontStyle.Bold);//字体样式(参数2为字体大小)  
                Brush b = new System.Drawing.SolidBrush(c[cindex]);
                Point dot = new Point(16, 16);
                //graph.DrawString(dot.X.ToString(),fontstyle,new SolidBrush(Color.Black),10,150);//测试X坐标显示间距的  
                float angle = rand.Next(-randAngle, randAngle);//转动的度数  
                graph.TranslateTransform(dot.X, dot.Y);//移动光标到指定位置  
                graph.RotateTransform(angle);
                graph.DrawString(chars.ToString(), f, b, 1, 1, format);
                //graph.DrawString(chars.ToString(),fontstyle,new SolidBrush(Color.Blue),1,1,format);  
                graph.RotateTransform(-angle);//转回去  
                graph.TranslateTransform(2, -dot.Y);//移动光标到指定位置  
            }
            //graph.DrawString(randomcode,fontstyle,new SolidBrush(Color.Blue),2,2); //标准随机码  
            //生成图片  
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            map.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
            HttpContext.Current.Response.ClearContent();
            HttpContext.Current.Response.ContentType = "image/gif";
            HttpContext.Current.Response.BinaryWrite(ms.ToArray());
            graph.Dispose();
            map.Dispose();
        }
    }
}


More ASP.NET MVC verification code function implementation code For related articles, please pay attention to the PHP Chinese website!


Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
The Continued Relevance of C# .NET: A Look at Current UsageThe Continued Relevance of C# .NET: A Look at Current UsageApr 16, 2025 am 12:07 AM

C#.NET is still important because it provides powerful tools and libraries that support multiple application development. 1) C# combines .NET framework to make development efficient and convenient. 2) C#'s type safety and garbage collection mechanism enhance its advantages. 3) .NET provides a cross-platform running environment and rich APIs, improving development flexibility.

From Web to Desktop: The Versatility of C# .NETFrom Web to Desktop: The Versatility of C# .NETApr 15, 2025 am 12:07 AM

C#.NETisversatileforbothwebanddesktopdevelopment.1)Forweb,useASP.NETfordynamicapplications.2)Fordesktop,employWindowsFormsorWPFforrichinterfaces.3)UseXamarinforcross-platformdevelopment,enablingcodesharingacrossWindows,macOS,Linux,andmobiledevices.

C# .NET and the Future: Adapting to New TechnologiesC# .NET and the Future: Adapting to New TechnologiesApr 14, 2025 am 12:06 AM

C# and .NET adapt to the needs of emerging technologies through continuous updates and optimizations. 1) C# 9.0 and .NET5 introduce record type and performance optimization. 2) .NETCore enhances cloud native and containerized support. 3) ASP.NETCore integrates with modern web technologies. 4) ML.NET supports machine learning and artificial intelligence. 5) Asynchronous programming and best practices improve performance.

Is C# .NET Right for You? Evaluating its ApplicabilityIs C# .NET Right for You? Evaluating its ApplicabilityApr 13, 2025 am 12:03 AM

C#.NETissuitableforenterprise-levelapplicationswithintheMicrosoftecosystemduetoitsstrongtyping,richlibraries,androbustperformance.However,itmaynotbeidealforcross-platformdevelopmentorwhenrawspeediscritical,wherelanguageslikeRustorGomightbepreferable.

C# Code within .NET: Exploring the Programming ProcessC# Code within .NET: Exploring the Programming ProcessApr 12, 2025 am 12:02 AM

The programming process of C# in .NET includes the following steps: 1) writing C# code, 2) compiling into an intermediate language (IL), and 3) executing by the .NET runtime (CLR). The advantages of C# in .NET are its modern syntax, powerful type system and tight integration with the .NET framework, suitable for various development scenarios from desktop applications to web services.

C# .NET: Exploring Core Concepts and Programming FundamentalsC# .NET: Exploring Core Concepts and Programming FundamentalsApr 10, 2025 am 09:32 AM

C# is a modern, object-oriented programming language developed by Microsoft and as part of the .NET framework. 1.C# supports object-oriented programming (OOP), including encapsulation, inheritance and polymorphism. 2. Asynchronous programming in C# is implemented through async and await keywords to improve application responsiveness. 3. Use LINQ to process data collections concisely. 4. Common errors include null reference exceptions and index out-of-range exceptions. Debugging skills include using a debugger and exception handling. 5. Performance optimization includes using StringBuilder and avoiding unnecessary packing and unboxing.

Testing C# .NET Applications: Unit, Integration, and End-to-End TestingTesting C# .NET Applications: Unit, Integration, and End-to-End TestingApr 09, 2025 am 12:04 AM

Testing strategies for C#.NET applications include unit testing, integration testing, and end-to-end testing. 1. Unit testing ensures that the minimum unit of the code works independently, using the MSTest, NUnit or xUnit framework. 2. Integrated tests verify the functions of multiple units combined, commonly used simulated data and external services. 3. End-to-end testing simulates the user's complete operation process, and Selenium is usually used for automated testing.

Advanced C# .NET Tutorial: Ace Your Next Senior Developer InterviewAdvanced C# .NET Tutorial: Ace Your Next Senior Developer InterviewApr 08, 2025 am 12:06 AM

Interview with C# senior developer requires mastering core knowledge such as asynchronous programming, LINQ, and internal working principles of .NET frameworks. 1. Asynchronous programming simplifies operations through async and await to improve application responsiveness. 2.LINQ operates data in SQL style and pay attention to performance. 3. The CLR of the NET framework manages memory, and garbage collection needs to be used with caution.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
4 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Best Graphic Settings
4 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. How to Fix Audio if You Can't Hear Anyone
4 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Chat Commands and How to Use Them
4 weeks agoBy尊渡假赌尊渡假赌尊渡假赌

Hot Tools

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

ZendStudio 13.5.1 Mac

ZendStudio 13.5.1 Mac

Powerful PHP integrated development environment

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

MinGW - Minimalist GNU for Windows

MinGW - Minimalist GNU for Windows

This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.

Atom editor mac version download

Atom editor mac version download

The most popular open source editor