帶運算的驗證碼

1. using System;
2. using System.Collections;
3. using System.ComponentModel;
4. using System.Data;
5. using System.Drawing;
6. using System.Web;
7. using System.Web.SessionState;
8. using System.Web.UI;
9. using System.Web.UI.WebControls;
10. using System.Web.UI.HtmlControls;
12. namespace WebApplication3
13. {
14.     /// <summary>
15.     /// WebForm1 的摘要說明。
16.     /// </summary>
17.     public class WebFormYanZhengMa : System.Web.UI.Page
18.     {
19.         protected System.Web.UI.WebControls.TextBox TextBox1;
20.         protected System.Web.UI.WebControls.Label Label1;
21.         protected System.Web.UI.WebControls.LinkButton LinkButton1;
22.         protected System.Web.UI.WebControls.Button Button1;
23.         #region Web 窗體設計器生成的代碼
24.         override protected void OnInit(EventArgs e)
25.         {
26.             //
27.             // CODEGEN: 該調用是 ASP.NET Web 窗體設計器所必需的。
28.             //
29.             InitializeComponent();
30.             base.OnInit(e);
31.         }
32.         
33.         /// <summary>
34.         /// 設計器支持所需的方法 - 不要使用代碼編輯器修改
35.         /// 此方法的內容。
36.         /// </summary>
37.         private void InitializeComponent()
38.         {    
39.             this.Button1.Click += new System.EventHandler(this.Button1_Click);
40.             this.LinkButton1.Click += new System.EventHandler(this.LinkButton1_Click);
41.             this.Load += new System.EventHandler(this.Page_Load);
43.         }
44.         #endregion
46.         #region 無運算驗證
47. //      private void Page_Load(object sender, System.EventArgs e)
48. //      {
49. //          if(!IsPostBack)
50. //          {
51. //              string ddd = readom(5);
52. //              Session["readom"]=ddd;
53. //              this.Label1.Text = ddd;
54. //          }
55. //      }
56. //      private void Button1_Click(object sender, System.EventArgs e)
57. //      {
58. //          if(this.TextBox1.Text==Session["readom"].ToString())
59. //          {
60. //              Response.Write("<script>alert('Ok')</script>");
61. //          }
62. //          else
63. //          {
64. //              Response.Write("<script>alert('Error')</script>");
65. //          }
66. //      }
67. //      public string readom(int nums)
68. //      {
69. //          string readom="";
70. //          //string ddd = "a,r,e,t,2,5,7,8,9,k,r,h,y,G,E,Y,T,E,W,d,2,3,5,0,1,6,j,m";
71. //          string ddd = "1,2,3,4,5,6,7,8,9,0";
72. //          string [] arr = ddd.Split(',');
73. //          Random ran = new Random();
74. //          
75. //          for(int i = 0 ; i < nums;i++ )
76. //          {
77. //              int a = ran.Next(arr.Length);
78. //              readom += arr[a].ToString();
79. //          }
80. //          return readom;
81. //      }
82. //      private void LinkButton1_Click(object sender, System.EventArgs e)
83. //      {
84. //          string ddd = readom(5);
85. //          Session["readom"]=ddd;
86. //          this.Label1.Text = ddd;
87. //      } 
88.         #endregion
90.         //加載
91.         private void Page_Load(object sender, System.EventArgs e)
92.         {
93.             if(!IsPostBack)
94.             {
95.                 yunsuan();
96.             }
97.         }   
98.         //驗證
99.         private void Button1_Click(object sender, System.EventArgs e)
100.         {
101.             if(this.TextBox1.Text==Session["readom"].ToString())
102.             {
103.                 Response.Write("<script>alert('Ok')</script>");
104.             }
105.             else
106.             {
107.                 Response.Write("<script>alert('Error')</script>");
108.             }
109.         }
110.         //換圖
111.         private void LinkButton1_Click(object sender, System.EventArgs e)
112.         {
113.             yunsuan();
114.         } 
115.         //生成隨機數
116.         public string readom(int nums)
117.         {
118.             string readom="";
119.             string ddd = "1,2,3,4,5,6,7,8,9";
120.             string [] arr = ddd.Split(',');
121.             Random ran = new Random();
122.             
123.             for(int i = 0 ; i < nums;i++ )
124.             {
125.                 int a = ran.Next(arr.Length);
126.                 readom +=arr[a].ToString();
127.             }
128.             return readom;
129.         }
130.         //運算
131.         public void yunsuan()
132.         {
133.             string ddd = readom(3);
134.             int a = int.Parse(ddd.Substring(0,2).ToString());
135.             int b = int.Parse(ddd.Substring(2,1).ToString());
136.             string ys = "+,-,*,/";
137.             string [] yu = ys.Split(',');
138.             Random dom = new Random();
139.             int yy =  dom.Next(yu.Length);
140.             string yusuan = yu[yy].ToString();
141.             int c=0;
142.             switch (yusuan)
143.             {
144.                 case "+":
145.                     c = a + b;
146.                     Session["readom"]=c;
147.                     this.Label1.Text = ""+a+"加上"+b+"=?";
148.                     break;
149.                 case "-":
150.                     c = a - b;
151.                     Session["readom"]=c;
152.                     this.Label1.Text = ""+a+"減去"+b+"=?";
153.                     break;
154.                 case "*":
155.                     c = a * b;
156.                     Session["readom"]=c;
157.                     this.Label1.Text = ""+a+"乘以"+b+"=?";
158.                     break;
159.                 case "/":
160.                     c = a / b;
161.                     Session["readom"]=c;
162.                     this.Label1.Text = ""+a+"除以"+b+"=?";
163.                     break;
164.             }
165.         }
166.     }
167. }