C# 验证码的随机生成
来园子好久了,一直都是看别人在发博客,自己从没写过自己的博客,.net也接触有一段时间了,虽然学的不好,不过自己挺喜欢这个方向,闲来无事,借花献佛,发表自己的处子之博客,不足之处还请大牛们多多请教!
废话不说了,下面贴出自己的代码, WinForm界面比较粗糙,但只是为了说明问题
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
1 using System; 2 using System.Collections.Generic; 3 using System.ComponentModel; 4 using System.Data; 5 using System.Drawing; 6 using System.Linq; 7 using System.Text; 8 using System.Windows.Forms; 9 10 namespace CheckCode 11 { 12 public partial class Form1 : Form 13 { 14 public Form1() 15 { 16 InitializeComponent(); 17 } 18 19 private void Form1_Load(object sender, EventArgs e) 20 { 21 CreateCheckCodeImage(GenerateCheckCode()); 22 } 23 24 //全局变量 用来当前记录验证码 25 private string checkCode = null; 26 27 private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e) 28 { 29 CreateCheckCodeImage(GenerateCheckCode()); 30 } 31 32 private void button1_Click(object sender, EventArgs e) 33 { 34 if (this.checkCode.ToLower()== textBox1.Text.ToLower()) 35 { 36 label1.Text = "输入正确"; 37 } 38 else 39 { 40 label1.Text = "输入错误,请重新输入!"; 41 } 42 } 43 44 /// <summary> 45 /// 生成随机四位Ascll码字符 46 /// </summary> 47 /// <returns>Ascll组成的字符串</returns> 48 private string GenerateCheckCode() 49 { 50 int number; 51 char code; 52 string checkCode = String.Empty; 53 System.Random random = new Random(); 54 55 for (int i = 0; i < 4; i++) 56 { 57 number = random.Next(); 58 59 if (number % 2 == 0) 60 code = (char)('0' + (char)(number % 10)); 61 62 else 63 code = (char)('A' + (char)(number % 26)); 64 65 checkCode += code.ToString(); 66 } 67 this.checkCode = checkCode; 68 return checkCode; 69 } 70 /// <summary> 71 /// 在Bitmap上画出对应的字符串 72 /// </summary> 73 /// <param name="checkCode"></param> 74 private void CreateCheckCodeImage(string checkCode) 75 { 76 if (checkCode == null || checkCode.Trim() == String.Empty) 77 return; 78 System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 22); 79 Graphics g = Graphics.FromImage(image); 80 try 81 { 82 //生成随机生成器 83 Random random = new Random(); 84 //清空图片背景色 85 g.Clear(Color.White); 86 //画图片的背景噪音线 87 for (int i = 0; i < 2; i++) 88 { 89 int x1 = random.Next(image.Width); 90 int x2 = random.Next(image.Width); 91 int y1 = random.Next(image.Height); 92 int y2 = random.Next(image.Height); 93 g.DrawLine(new Pen(Color.Black), x1, y1, x2, y2); 94 } 95 Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic)); 96 System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true); 97 g.DrawString(checkCode, font, brush, 2, 2); 98 //画图片的前景噪音点 99 for (int i = 0; i < 100; i++) 100 { 101 int x = random.Next(image.Width); 102 int y = random.Next(image.Height); 103 image.SetPixel(x, y, Color.FromArgb(random.Next())); 104 } 105 //画图片的边框线 106 g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1); 107 System.IO.MemoryStream ms = new System.IO.MemoryStream(); 108 image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif); 109 Image img = Image.FromStream(ms); 110 pictureBox1.Image = img; 111 112 } 113 finally 114 { 115 g.Dispose(); 116 image.Dispose(); 117 } 118 } 119 120 } 121 }
总结:第一次写博客,代码也比较容易理解,其他的就不多说了!