验证码控件

源码下载

 

 

using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;
using System.IO;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
using System.Web.UI.HtmlControls;
using System.Drawing;
using System.Collections;



namespace rsfcValidataNumber
{
        [DefaultProperty("Text"),
        ToolboxData("<{0}:WebCustomControl1 runat=server></{0}:WebCustomControl1>")]
    public class WebCustomControl1 : System.Web.UI.WebControls.WebControl
    {
        private string text;

        [Bindable(true),
            Category("Appearance"),
            DefaultValue("")]
        public string Text
        {
            get
            {
                return text;
            }

            set
            {
                text = value;
            }
        }

                protected override void Render(HtmlTextWriter output)
        {
          
            if(cont=="number")
            {

                CreateValidateGraphic(objpage,CreateValidateNumber(number));
            }
            else if (cont=="char")
            {
                CreateValidateGraphic(objpage,RandomChar(number));
            }
            else if(cont=="+")
            {


                CreateValidateGraphic(objpage,CreateValidateNumber(number)+RandomChar(number));
            }
            
        }

        public Page objpage;
        public int number;
        public string cont;

               public virtual  int  VNumber
        {
            set{number=value;}
        }

        public virtual  Page Obj
        {
            set{objpage=value;}
        }
        public virtual string Control
        {
            set{cont=value;}
        }
        
        


        public string RandomChar(int TheStringNumber)
        {
            string rachar="";
            Random rd=new Random(); 
            ArrayList strA = new ArrayList(); 
            for (int i = 0; i < TheStringNumber; i++) 
            { 
                char ch; 
                ch=(char)(Math.Ceiling(rd.NextDouble() * 26)+64); 
                strA.Add(ch); 
            } 
            for (int i = 0; i < TheStringNumber; i++) 
                rachar=rachar+strA[i].ToString(); 
            return rachar;
        }
              public string CreateValidateNumber(int length)
        {
            int[] randMembers=new int[length];
            int[] validateNums=new int[length];
            string validateNumberStr="";
                       int seekSeek=unchecked((int)DateTime.Now.Ticks);
            Random seekRand=new Random(seekSeek);
            int beginSeek=(int)seekRand.Next(0,Int32.MaxValue-length*10000);
            int[] seeks=new int[length];
            for(int i=0;i<length;i++)
            {
                beginSeek+=10000;
                seeks[i]=beginSeek;
            }
         
            for(int i=0;i<length;i++)
            {
                Random rand=new Random(seeks[i]);
                int pownum=1*(int)Math.Pow(10,length);
                randMembers[i]=rand.Next(pownum,Int32.MaxValue);
            }
            
            for(int i=0;i<length;i++)
            {
                string numStr=randMembers[i].ToString();
                int numLength=numStr.Length;
                Random rand=new Random();
                int numPosition=rand.Next(0,numLength-1);
                validateNums[i]=Int32.Parse(numStr.Substring(numPosition,1));
            }
          
            for(int i=0;i<length;i++)
            {
                validateNumberStr+=validateNums[i].ToString();
            }
            return validateNumberStr;
        }
              public void CreateValidateGraphic(Page containsPage,string validateNum)
        {
            
            Bitmap image=new Bitmap((int)Math.Ceiling(validateNum.Length*12.5),22);
            Graphics g=Graphics.FromImage(image);
            try
            {
                              Random random=new Random();
                
                g.Clear(Color.White);
                
                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 Font("Arial",12,(FontStyle.Bold|FontStyle.Italic));
                LinearGradientBrush brush=new LinearGradientBrush(new Rectangle(0,0,image.Width,image.Height),
                    Color.Blue,Color.DarkRed,1.2f,true);
                g.DrawString(validateNum,font,brush,3,2);
               
                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()));
                }
                            g.DrawRectangle(new Pen(Color.Silver),0,0,image.Width-1,image.Height-1);
                             MemoryStream stream=new MemoryStream();
                image.Save(stream,ImageFormat.Jpeg);
                
                containsPage.Response.Clear();
                containsPage.Response.ContentType="image/jpeg";
                containsPage.Response.BinaryWrite(stream.ToArray());
            }
            finally
            {
                g.Dispose();
                image.Dispose();
            }
        }
    }
}