運行結果:
代碼:
1) VS2015 新建一個WindowsFormsApplication工程,
2) 在Form1.cs中,添加如下控件:
表 窗體及控件屬性設置
窗體和控件 |
屬性 |
屬性值 |
Form1 |
Text |
驗證碼 |
pictureBox1 |
Name |
pictureBoxCode |
textBox1 |
Name |
txtCode |
button1 |
Name |
btnCheck |
Text |
驗證 |
3) 鼠標右擊Form1.cs 找到對應的代碼工程,代碼部分參考如下代碼:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
//功能 : 驗證碼的生成與匹配
namespace WinFormsVerificationCode
{
public partial class Form1 : Form
{
//在主窗體中定義全局變量
string randomCode = string.Empty;
//方法:生成隨機字符串
private string CreateRandomCode(int codeCount)
{
string randomCode = "";
string allchar = "0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z";
string[] allCharArray = allchar.Split(',');//分割 生成子串
Random rand = new Random();
for (int i = 0; i < codeCount; i++)
{
//生成隨機數 且 該隨機數<=allCharArray.Length
randomCode += allCharArray[rand.Next(allCharArray.Length)].ToString();
}
return randomCode;
}
//方法:生成驗證碼圖像
private Bitmap CreateImage(string code, int fontSize, string font, Color foreColor, Color bgColor)
{
int imageWidth = (code.Length * fontSize) + 40;//圖片寬度
int imageHeight = fontSize * 2 + 10;//圖片高度
Bitmap image = new Bitmap(imageWidth, imageHeight);//生成圖片框
Graphics g = Graphics.FromImage(image);
g.Clear(bgColor);
Font f = new Font(font, fontSize, FontStyle.Bold);
//使用指定的畫筆和字體對象在指定位置繪製指定的文本字符串。
g.DrawString(code, f, new SolidBrush(ForeColor), 1, 1);//設置驗證碼
Random rnd = new Random();
//給背景添加隨機生成的燥點
for (int i = 0; i < 100; i++)
{
int x = rnd.Next(imageWidth);
int y = rnd.Next(imageHeight);
g.FillRectangle(new SolidBrush(Color.FromArgb(rnd.Next())), x, y, 2, 2);
}
//給背景添加隨機生成的干擾線
for (int i = 0; i < 50; i++)
{
int x1 = rnd.Next(imageWidth);
int x2 = rnd.Next(imageWidth);
int y1 = rnd.Next(imageHeight);
int y2 = rnd.Next(imageHeight);
g.DrawLine(new Pen(Color.FromArgb(rnd.Next()), 2), x1, y1, x2, y2);
}
return image;
}
//方法:刷新驗證碼
private void freshCode()
{
randomCode = CreateRandomCode(5);
pictureBoxCode.Image = CreateImage(randomCode, 35, "宋體", Color.Blue, Color.White);
}
public Form1()
{
InitializeComponent();
}
//按鈕點擊事件處理程序
private void btnCheck_Click(object sender, EventArgs e)
{
if (randomCode.ToUpper() != txtCode.Text.ToUpper())
{
MessageBox.Show("驗證碼輸入錯誤,請重新輸出!");
txtCode.Text = "";
freshCode();
}
else
{
MessageBox.Show("恭喜,驗證碼輸入正確!");
}
}
//窗體加載事件處理程序
private void Form1_Load(object sender, EventArgs e)
{
freshCode();
}
}
}