asp.net mvc項目使用到驗證碼，為了讓以前的WebForm代碼能利用上代碼經過稍微的改動即可使用代碼如下：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
|
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 { //生成隨機生成器 Random random = new Random(); //清空圖片背景色 g.Clear(Color.White); //畫圖片的背景噪音線 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); //畫圖片的前景噪音點 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())); } //畫圖片的邊框線 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(); } } }} |
最后別忘了session的獲取設置，需要在Global.asax.cs文件中新增如下代碼：
|
1
2
3
4
5
6
7
8
9
10
11
12
|
/// <summary>/// MVC為了獲取session參數/// </summary>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頁面代碼：
html代碼
|
1
2
3
4
5
|
<img name="img1" id="img1" style="position:absolute;top:5px;right:36px!important;z-index:1000;" alt="單擊圖片刷新驗證碼" src="CheckCode/Index" <br>onclick="JavaSccript:reloadImage('CheckCode/Index');" /><br><script type="text/javascript">function reloadImage(url) {document.getElementById("img1").src = url + '?abc=' + Math.random();} </script> |
總結
以上所述是小編給大家介紹的asp.net MVC 在Controller控制器中實現驗證碼輸出功能，希望對大家有所幫助，如果大家有任何疑問請給我留言，小編會及時回復大家的。在此也非常感謝大家對服務器之家網站的支持！
如果你覺得本文對你有幫助，歡迎轉載，煩請注明出處，謝謝！
原文鏈接：https://www.cnblogs.com/angelasp/archive/2019/12/02/11971519.html
