asp.net validation code generation Class (reference)

Asp.net| Reference | Verification Code **********************created by chen**************************

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* Source and original creator, Thank you!!! Email:aishen944-sohu.com

*******************************************************************/
Using System;
Using System.Drawing;
Using System.Drawing.Imaging;
Using System.Web.UI;
Using System.Drawing.Drawing2D;
Using System.IO;
Namespace Validate
{
<summary>
Class that generates the verification code
</summary>
public class ValidateNumber
{
Public ValidateNumber ()
{
}
<summary>
Maximum length of verification code
</summary>
public int MaxLength
{
Get{return 10;}
}
<summary>
Minimum length of verification code
</summary>
public int MinLength
{
Get{return 1;}
}
<summary>
Generate Verification Code
</summary>
<param name= "Length" > Specified verification code lengths </param>
<returns></returns>
public string createvalidatenumber (int length)
{
Int[] Randmembers=new int[length];
Int[] Validatenums=new int[length];
String Validatenumberstr= "";
Generate Start Sequence values
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;
}
Generate random numbers
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);
}
Extract random numbers
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));
}
Generate Verification Code
for (int i=0;i<length;i++)
{
Validatenumberstr+=validatenums[i]. ToString ();
}
return validatenumberstr;
}
<summary>
Create a picture of the verification code
</summary>
<param name= "Containspage" > Page object to Output </param>
<param name= "Validatenum" > Verification Code </param>
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
{
Generate a random generator
Random random=new Random ();
Empty picture background color
G.clear (Color.White);
Disturbing lines for drawing pictures
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", 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);
Picture of the foreground interference point
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 ()));
}
Draw a picture's border line
G.drawrectangle (New Pen (Color.silver), 0,0,image. Width-1,image. HEIGHT-1);
Save picture data
MemoryStream stream=new MemoryStream ();
Image. Save (Stream,imageformat.jpeg);
Output picture
ContainsPage.Response.Clear ();
Containspage.response.contenttype= "Image/jpeg";
ContainsPage.Response.BinaryWrite (stream. ToArray ());
}
Finally
{
G.dispose ();
Image. Dispose ();
}
}
<summary>
Get the length of the Verification code picture
</summary>
<param name= "Validatenumlength" > Verification Code length </param>
<returns></returns>
public static int getimagewidth (int validatenumlength)
{
return (int) (validatenumlength*12.5);
}
<summary>
Get the height of the verification code
</summary>
<returns></returns>
public static double Getimageheight ()
{
return 22.5;
}
}
}