隨機(jī)生成字母數(shù)字驗(yàn)證碼可定義驗(yàn)證碼的長度

1、隨機(jī)生成字母數(shù)字驗(yàn)證碼，可定義驗(yàn)證碼的長度隨機(jī)生成字母數(shù)字驗(yàn)證碼，可定義驗(yàn)證碼的長度本文關(guān)鍵字：本文關(guān)鍵字：隨機(jī)生成字母數(shù)字驗(yàn)證碼usingSystem;usingSystem.Data;usingSystem.Configuration;usingSystem.Collections;usingSystem.Web;usingSystem.Web.Security;usingSystem.Web.UI;usingSystem.Web.UI.WebControls;usingSystem.Web.UI.WebControls.WebParts;usingSystem.Web.UI.HtmlCo

2、ntrols;usingSystem.Drawing;usingSystem.Drawing.Imaging;publicpartialclassLogin:System.Web.UI.PtectedvoidPage_Load(objectsender,EventArgse).if(!IsPostBack).this.CreateCheckCodeImage(GenerateCheckCode();privatestringGenerateCheckCode()1234512345.intnumber;charcode;stringcheckCode=String.Empty;本

3、文關(guān)鍵字：本文關(guān)鍵字：System.Randomrandom=newRandom();for(inti=0;i15;i+).number=random.Next();if(number%2=0)code=(char)(0+(char)(number%10);elsecode=(char)(A+(char)(number%26);checkCode+=code.ToString();Response.Cookies.Add(newHttpCookie(CheckCode,checkCode);returncheckCode;privatevoidCreateCheckCodeImage(stri

4、ngcheckCode).if(checkCode=null|checkCode.本文關(guān)鍵字：本文關(guān)鍵字：try./生成隨機(jī)生成器Randomrandom=newRandom();/清空圖片背景色g.Clear(Color.White);/畫圖片的背景噪音線for(inti=0;i35;i+).intx1=random.Next(image.Width);intx2=random.Next(image.Width);inty1=random.Next(image.Height);inty2=random.Next(image.Height);g.DrawLine(newPen(Color.Silver),x1,y1,x2,y2);br本文關(guān)鍵字：本文關(guān)鍵字：/畫圖片的前景噪音點(diǎn)for(inti=0;i180;i+).intx=random.Next(image.Width);inty=random.Next(image.Height);image.SetPixel(x,y,Color.FromArgb(random.Next();/畫圖片的邊框線g.DrawRectangle(newPen(Color.Silver),0,0,image.Width-1,image.Height-1);image.Save(Server.MapPath