. NET Chinese and English mixed authentication Code implementation Codes _ Practical skills

The final effect is as shown:

The CheckCode.aspx.cs code is as follows

Copy Code code as follows:

protected void Page_Load (object sender, EventArgs e)
{
Get GB2312 Encoding page (table)
/**//**
* The method used to generate verification code in Chinese
* Note, to generate a Chinese verification code to change the width of the generated verification code picture
* var imagecode = new System.Drawing.Bitmap (int) math.ceiling (code. Length * 22.5)), 23); Define the width and height of the picture
**/

var GB = encoding.getencoding ("gb2312");

/**/////Call function produces 4 random Chinese encoding
object[] bytes = Createregioncode (4);

/**/////decoding Chinese characters according to the encoding byte array
var sbcode = new StringBuilder (). Append (GB. GetString ((byte[]) Convert.changetype (bytes[0), typeof (byte[)))
// . Append (GB. GetString ((byte[]) Convert.changetype (bytes[1), typeof (byte[)))
// . Append (GB. GetString ((byte[]) Convert.changetype (bytes[2), typeof (byte[)))
// . Append (GB. GetString ((byte[]) Convert.changetype (bytes[3), typeof (byte[)));
Createcheckcodeimage (Sbcode.tostring ());

Createcheckcodeimage (Generatecheckcode ()); The method to use to generate the digital English
}

Generating Chinese character verification code #region generating Chinese character verification code
/**////<summary>
This function randomly creates a hexadecimal byte array with two elements in the range of encoding, each byte array represents a Chinese character, and four byte arrays are stored in an object array.
</summary>
<param name= "Strlength" > represents the number of Chinese characters to be produced </param>
<returns></returns>
Static object[] Createregioncode (int strlength)
{
var rbase = new[]
{
"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "B", "C", "D", "E", "F"
};

var random = new Random ();
var bytes = new Object[strlength];

/**//* produces a hexadecimal byte array of two elements at a time, and puts it in a bject array
Each Chinese character is composed of four location codes.
Location Code 1th and location code 2nd bit as the first element of a byte array
Location Code 3rd and Location Code 4th digits as the second element of a byte array
*/

for (int i = 0; i < strlength; i++)
{
Location Code 1th Place
var r1 = random. Next (11, 14);
var str_r1 = Rbase[r1]. Trim ();

Random = new Random (R1 * Unchecked ((int) DateTime.Now.Ticks) + i); Replace the seed of the random number generator to avoid duplicate values

var r2 = 0;
if (r1 = 13)
r2 = random. Next (0, 7);
Else
r2 = random. Next (0, 16);

var str_r2 = rbase[r2]. Trim ();

Location Code 3rd place
Random = new Random (R2 * Unchecked ((int) DateTime.Now.Ticks) + i);
var r3 = random. Next (10, 16);
var str_r3 = Rbase[r3]. Trim ();

Location Code 4th place
Random = new Random (R3 * Unchecked ((int) DateTime.Now.Ticks) + i);
var r4 = 0;
if (R3 = 10)
R4 = random. Next (1, 16);
else if (r3 = 15)
R4 = random. Next (0, 15);
Else
R4 = random. Next (0, 16);

var str_r4 = Rbase[r4]. Trim ();

var byte1 = convert.tobyte (str_r1 + str_r2, 16);
var byte2 = convert.tobyte (Str_r3 + STR_R4, 16);
Storing two byte variables in a byte array
var str_r = new[] {byte1, byte2};

Puts a byte array of the resulting Chinese character into an object array
bytes. SetValue (Str_r, i);
}
return bytes;
}
#endregion

Generate pictures #region Generate pictures
void Createcheckcodeimage (String code)
{
var imagecode = new System.Drawing.Bitmap (int) math.ceiling (code. Length * 12.5)), 23); Define the width and height of the picture
var g = graphics.fromimage (Imagecode); Load the picture onto the canvas

Try
{
var random = new Random ();
G.clear (Color.White); Empty picture background color

Background noise line for painting pictures
for (int i = 0; i < i++)
{
var x1 = random. Next (Imagecode.width);
var x2 = random. Next (Imagecode.width);
var y1 = random. Next (Imagecode.height);
var y2 = random. Next (Imagecode.height);

G.drawline (New Pen (Color.silver), new Point (x1, y1), New Point (x2, y2));
}

var font = new System.Drawing.Font ("Arial", 12F, System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic);
var brush = new System.Drawing.Drawing2D.LinearGradientBrush (
New Rectangle (0, 0, Imagecode.width, imagecode.height),
Color.Blue, color.darkred, 1.2F, true);
g.DrawString (code, font, Brush, 2, 2);

Picture of the foreground noise point
for (int i = 0; i < i++)
{
var x = random. Next (Imagecode.width);
var y = random. Next (Imagecode.height);
Imagecode.setpixel (x, Y, Color.FromArgb) (random. Next ()));
}

Draw a picture's border line
G.drawrectangle (New Pen (Color.silver), 0, 0, imagecode.width-1, imagecode.height-1);
var ms = new System.IO.MemoryStream ();
Imagecode.save (MS, System.Drawing.Imaging.ImageFormat.Jpeg);

Response.clearcontent ();
Response.ContentType = "Image/jpeg";
Response.BinaryWrite (Ms. ToArray ());
}
Finally
{
G.dispose ();
Imagecode.dispose ();
}

}
#endregion

Generate Data verification Code #region generate data verification code
private String Generatecheckcode ()
{
int number;
char code;
string checkcode = String.Empty;

var random = new Random ();

for (int i = 0; i < 5; i++)
{
Number = random. Next ();

if (number% 2 = 0)
Code = (char) (' 0 ' + (char) (number% 10));
Else
Code = (char) (' A ' + (char) (number% 26);

Checkcode + = code. ToString ();
}
return checkcode;
}
#endregion

To use the Authentication code page:

Copy Code code as follows:

<form id= "FormCode" runat= "Server" >
<div>

</div>
</form>