MVC3 Verification Code

Public ActionResult Getvalidatecode ()
{

String code = Createvalidatecode (5);
session["Validatecode"] = code;
byte[] bytes = createvalidategraphic (code);
Return File (bytes, @ "Image/jpeg");
}

<summary>
Generate Verification Code
</summary>
<param name= "Length" > Specified verification code lengths </param>
<returns></returns>
public string Createvalidatecode (int length)
{
int[] randmembers = new Int[length];
int[] validatenums = new Int[length];
String validatenumberstr = "";
Generate a starting Sequence value
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 (ten, length);
Randmembers[i] = rand. Next (Pownum, Int32.MaxValue);
}
Extracting 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 export to </param>
<param name= "Validatenum" > Verification Code </param>
Public byte[] Createvalidategraphic (string validatecode)
{
Bitmap image = new Bitmap ((int) math.ceiling (validatecode.length * 12.0), 22);
Graphics g = graphics.fromimage (image);
Try
{
Generate Random Generators
Random random = new random ();
Clear the background color of the picture
G.clear (Color.White);
Interference lines for drawing pictures
for (int i = 0; i <; 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", page, (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 (Validatecode, Font, Brush, 3, 2);
Foreground interference point of picture painting
for (int i = 0; i <; i++)
{
int x = random. Next (image. Width);
int y = random. Next (image. Height);
Image. SetPixel (x, Y, Color.FromArgb (random. Next ()));
}
Draw the border line of a picture
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 Stream
return stream. ToArray ();
}
Finally
{
G.dispose ();
Image. Dispose ();
}
}

$ (function () {
$ ("#valiCode"). Bind ("click", Function () {
THIS.SRC = "/public/getvalidatecode?time=" + (new Date ()). GetTime ();
});
});</script>

There is also a well-packaged MVC verification code component, which is also very useful.

http://www.webdiyer.com/mvccaptcha/

Reference Original: http://www.cnblogs.com/fumj/archive/2012/07/08/2581561.html

MVC3 Verification Code