Implementation of simple C #, ASP. NET MVC Verification Code

Using System;
Using System.Collections.Generic;
Using System.Linq;
Using System.Web;
Using System.Text;
Using System.Drawing;
Using System.IO;

The implementation of the namespace verification code. Validatecode
{
<summary>
Verification Code generation Tool class
</summary>
///

public class Validatecodehelper
{
private static Random Rand = new Random ();
private static string code;
<summary>
Randomly generate verification codes of the specified length
</summary>
<param name= "Length" ></param>
<returns></returns>
public static string GetCode (int length) {

String codes = "AaBbCcDdEeFfJjHhIiJjKkMmNnPpQrRSsTtUuVvWwXxYyZz0123456789";

StringBuilder sb = new StringBuilder ();
for (int i = 0; I <length; i++)
{
int Index=rand. Next (codes. Length);
if (sb.) ToString (). Contains (Codes[index])) {

i--;
Continue
}
Sb. Append (Codes[index]);
}
Code = SB. ToString ();
return code;

}

<summary>
Get random colors
</summary>
<returns></returns>
private static Color Getrandomcolor () {

int red = rand. Next (10, 255);
int green = rand. Next (10, 255);
int blue = rand. Next (10, 255);

Return Color.FromArgb (red, green, blue);
}

<summary>
Generate Verification Code
</summary>
<returns></returns>
public static byte[] Validatecode (string code) {

Bitmap img = new Bitmap (100,30);
Graphics g = Graphics.fromimage (IMG);
G.fillrectangle (brushes.white, 0, 0, IMG. Width, IMG. Height);
G.drawrectangle (New Pen (Color.Black), 1, 1, IMG. Width-2, IMG. HEIGHT-2);
Brush Bush = new SolidBrush (color.steelblue);
g.DrawString (Code, New Font ("Blackbody", Fontstyle.italic), Bush, 10, 2);
Random r = new Random ();
Draw lines
for (int i = 0; i < 5; i++)
{
G.drawline (New Pen (Getrandomcolor ()), R.next (IMG. Width), R.next (IMG. Height), R.next (IMG. Width), R.next (IMG. Height));
}
Draw a bit of mania
for (int i = 0; i <; i++)
{
Img. SetPixel (R.next (img. Width), R.next (IMG. Height), Getrandomcolor ());
}
MemoryStream ms = new MemoryStream ();
Img. Save (MS, System.Drawing.Imaging.ImageFormat.Jpeg);

byte[] data = Ms. GetBuffer ();
G.dispose ();
Ms. Close ();
return data;
}

<summary>
Generate Verification Code
</summary>
<param name= "Code" > Verification Code </param>
<param name= "FontColor" > Captcha color </param>
<returns></returns>
public static byte[] Validatecode (string Code,color fontcolor) {

Bitmap img = new Bitmap (100,30);
Graphics g = Graphics.fromimage (IMG);

G.fillrectangle (brushes.white,0, 0, IMG. Width, IMG. Height);

Brush Bush = new SolidBrush (fontcolor);
g.DrawString (Code, New Font ("Blackbody", Fontstyle.italic), Bush, 10, 2);
Random r = new Random ();
Draw lines
for (int i = 0; i < 5; i++)
{
G.drawline (New Pen (Getrandomcolor ()), R.next (IMG. Width), R.next (IMG. Height), R.next (IMG. Width), R.next (IMG. Height));
}
Draw a bit of mania
for (int i = 0; i <; i++)
{
Img. SetPixel (R.next (img. Width), R.next (IMG. Height), Getrandomcolor ());
}
MemoryStream ms = new MemoryStream ();
Img. Save (MS, System.Drawing.Imaging.ImageFormat.Jpeg);

byte[] data = Ms. GetBuffer ();
G.dispose ();
Ms. Close ();
return data;
}
<summary>
Generate Verification Code
</summary>
<param name= "Code" > Verification Code </param>
<param name= "FontColor" > Captcha color </param>
<param name= "BackgroundColor" > Captcha background color </param>
<returns></returns>
public static byte[] Validatecode (String Code,color backgroundcolor, Color fontcolor)
{

Bitmap img = new Bitmap (100, 30);
Graphics g = Graphics.fromimage (IMG);
Brush bush1 = new SolidBrush (backgroundcolor);
G.fillrectangle (bush1, 0, 0, IMG. Width, IMG. Height);
Brush Bush = new SolidBrush (fontcolor);
g.DrawString (Code, New Font ("Blackbody", Fontstyle.italic), Bush, 10, 2);
Random r = new Random ();
Draw lines
for (int i = 0; i < 5; i++)
{
G.drawline (New Pen (Getrandomcolor ()), R.next (IMG. Width), R.next (IMG. Height), R.next (IMG. Width), R.next (IMG. Height));
}
Draw a bit of mania
for (int i = 0; i <; i++)
{
Img. SetPixel (R.next (img. Width), R.next (IMG. Height), Getrandomcolor ());
}
MemoryStream ms = new MemoryStream ();
Img. Save (MS, System.Drawing.Imaging.ImageFormat.Jpeg);

byte[] data = Ms. GetBuffer ();
G.dispose ();
Ms. Close ();
return data;
}

<summary>
Determine if the verification code is correct
</summary>
<param name= "Code" ></param>
<returns></returns>
public static bool Isvalidate (string Code) {

if (string. IsNullOrEmpty (Code) | |! Code. ToLower (). Equals (Code.tolower ())) {

return false;
}

return true;
}
}
}

Calls in the controller

Public ActionResult Validatecode () {

Gets the specified length verification code

String code= Validatecodehelper.getcode (5);
tempdata["Code" = code;//Storage Verification Code for verification

Draws the captcha to the picture, saves it to the memory stream, and returns a byte array
Byte[] data= Validatecodehelper.validatecode (code);

return File (data, "image/jpeg");
}

On the front end of the call

<script>

function Change () {

var img = document.getelementsbytagname (' img ') [0];

IMG.SRC = Img.src + "?";

}
</script>
<form method= "POST" action= "/home/login" >
<table>
<tr>
<td> Verification Code:</td>
<td>
<a href= "javascript:void (0)" onclick= "Change ()" > For a new </a>
</td>
</tr>
<tr>
<td> Enter the verification code:</td>
<td><input type= "text" name= "code"/></td>
</tr>
</table>
<input type= "Submit" value= "Submission"/>
</form>

Implementation of simple C #, ASP. NET MVC Verification Code