asp.net MVC 在Controller控制器中实现验证码输出功能

 asp.net mvc项目使用到验证码，为了让以前的WebForm代码能利用上代码经过稍微的改动即可使用代码如下：

using System;
using System.Collections.Generic;
using System.Web;
using System.Web.Mvc;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Drawing;
namespace Angel.Web.Controllers
{
  public class CheckCodeController : Controller
  {
    //
    // GET: /CheckCode/
    public ActionResult Index()
    {
      this.CreateCheckCodeImage(GenerateCheckCode());
      return View();
    }
    private string GenerateCheckCode()
    {
      int number;
      char code;
      string checkCode = String.Empty;
      System.Random random = new Random();
      for (int i = 0; i < 5; i++)
      {
 number = random.Next();
 if (number % 2 == 0)
   code = (char)('0' + (char)(number % 10));
 else
   code = (char)('A' + (char)(number % 26));
 if (code == '0' || code == 'o' || code == 'L' || code == 'I')
 {
   i = i - 1;
 }
 else
 {
   checkCode += code.ToString();
 }
      }
      // Response.cookies.Add(new Httpcookie("CheckCode", checkCode));
      Session.Contents["checkcode"] = checkCode;
      return checkCode;
    }
    private void CreateCheckCodeImage(string checkCode)
    {
      if (checkCode == null || checkCode.Trim() == String.Empty)
 return;
      System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 22);
      Graphics g = Graphics.FromImage(image);
      try
      {
 //生成随机生成器
 Random random = new Random();
 //清空图片背景色
 g.Clear(Color.White);
 //画图片的背景噪音线
 for (int i = 0; i < 25; i++)
 {
   int x1 = random.Next(image.Width);
   int x2 = random.Next(image.Width);
   int y1 = random.Next(image.Height);
   int y2 = random.Next(image.Height);
   g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
 }
 Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic));
 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);
 g.DrawString(checkCode, font, brush, 2, 2);
 //画图片的前景噪音点
 for (int i = 0; i < 100; i++)
 {
   int x = random.Next(image.Width);
   int y = random.Next(image.Height);
   image.SetPixel(x, y, Color.FromArgb(random.Next()));
 }
 //画图片的边框线
 g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
 System.IO.MemoryStream ms = new System.IO.MemoryStream();
 image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
 Response.ClearContent();
 Response.ContentType = "image/Gif";
 Response.BinaryWrite(ms.ToArray());
      }
      finally
      {
 g.Dispose();
 image.Dispose();
      }
    }
  }
}

　　最后别忘了session的获取设置，需要在Global.asax.cs文件中新增如下代码：

/// 

/// MVC为了获取session参数
/// 
public override void Init()
{
  PostAuthenticateRequest += (s, e) => HttpContext.Current.SetSessionStateBehavior(SessionStateBehavior.Required);
  base.Init();
}
void MvcApplication_PostAuthenticateRequest(object sender, EventArgs e)
{
  HttpContext.Current.SetSessionStateBehavior(SessionStateBehavior.Required);
}

html页面代码：

html代码

onclick="JavaSccript:reloadImage('CheckCode/Index');" />

总结

以上所述是小编给大家介绍的asp.net MVC 在Controller控制器中实现验证码输出功能，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对考高分网网站的支持！
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