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public void ShowCode()

{

//对象实例化

Validate GifValidate = new Validate();

#region 对验证码进行设置(不进行设置时,将以默认值生成)

//验证码位数，不小于4位

GifValidate.ValidateCodeCount = 4;

//验证码字体型号(默认13)

GifValidate.ValidateCodeSize = 13;

//验证码图片高度,高度越大,字符的上下偏移量就越明显

GifValidate.ImageHeight = 23;

//验证码字符及线条颜色(需要参考颜色类)

GifValidate.DrawColor = System.Drawing.Color.BlueViolet;

//验证码字体(需要填写服务器安装的字体)

GifValidate.ValidateCodeFont = "Arial";

//验证码字符是否消除锯齿

GifValidate.FontTextRenderingHint = false;

//定义验证码中所有的字符(","分离),似乎暂时不支持中文

GifValidate.AllChar = "1,2,3,4,5,6,7,8,9,0,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,W,X,Y,Z";

#endregion

//输出图像(Session名称)

GifValidate.OutPutValidate("GetCode");

}

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public class Validate

{

public string AllChar = "1,2,3,4,5,6,7,8,9,0,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,W,X,Y,Z";

public Color DrawColor = Color.BlueViolet;

public bool FontTextRenderingHint = false;

public int ImageHeight = 0x17;

private byte TrueValidateCodeCount = 4;

protected string ValidateCode = "";

public string ValidateCodeFont = "Arial";

public float ValidateCodeSize = 13f;

private void CreateImageBmp(out Bitmap ImageFrame)

{

char[] chArray = this.ValidateCode.ToCharArray(0, this.ValidateCodeCount);

int width = (int) (((this.TrueValidateCodeCount * this.ValidateCodeSize) * 1.3) + 4.0);

ImageFrame = new Bitmap(width, this.ImageHeight);

Graphics graphics = Graphics.FromImage(ImageFrame);

graphics.Clear(Color.White);

Font font = new Font(this.ValidateCodeFont, this.ValidateCodeSize, FontStyle.Bold);

Brush brush = new SolidBrush(this.DrawColor);

int maxValue = (int) Math.Max((float) ((this.ImageHeight - this.ValidateCodeSize) - 3f), (float) 2f);

Random random = new Random();

for (int i = 0; i < this.TrueValidateCodeCount; i++)

{

int[] numArray = new int[] { (((int) (i * this.ValidateCodeSize)) + random.Next(1)) + 3, random.Next(maxValue) };

Point point = new Point(numArray[0], numArray[1]);

if (this.FontTextRenderingHint)

{

graphics.TextRenderingHint = TextRenderingHint.SingleBitPerPixel;

}

else

{

graphics.TextRenderingHint = TextRenderingHint.AntiAlias;

}

graphics.DrawString(chArray[i].ToString(), font, brush, (PointF) point);

}

graphics.Dispose();

}

private void CreateImageGif()

{

AnimatedGifEncoder encoder = new AnimatedGifEncoder();

MemoryStream stream = new MemoryStream();

encoder.Start();

encoder.SetDelay(5);

encoder.SetRepeat(0);

for (int i = 0; i < 10; i++)

{

Bitmap bitmap;

this.CreateImageBmp(out bitmap);

this.DisposeImageBmp(ref bitmap);

bitmap.Save(stream, ImageFormat.Png);

encoder.AddFrame(Image.FromStream(stream));

stream = new MemoryStream();

}

encoder.OutPut(ref stream);

HttpContext.Current.Response.ClearContent();

HttpContext.Current.Response.ContentType = "image/Gif";

HttpContext.Current.Response.BinaryWrite(stream.ToArray());

stream.Close();

stream.Dispose();

}

private void CreateValidate()

{

this.ValidateCode = "";

string[] strArray = this.AllChar.Split(new char[] { ',' });

int index = -1;

Random random = new Random();

for (int i = 0; i < this.ValidateCodeCount; i++)

{

if (index != -1)

{

random = new Random((i * index) * ((int) DateTime.Now.Ticks));

}

int num3 = random.Next(0x23);

if (index == num3)

{

this.CreateValidate();

}

index = num3;

this.ValidateCode = this.ValidateCode + strArray[index];

}

if (this.ValidateCode.Length > this.TrueValidateCodeCount)

{

this.ValidateCode = this.ValidateCode.Remove(this.TrueValidateCodeCount);

}

}

private void DisposeImageBmp(ref Bitmap ImageFrame)

{

Graphics graphics = Graphics.FromImage(ImageFrame);

Pen pen = new Pen(this.DrawColor, 1f);

Random random = new Random();

Point[] pointArray = new Point[2];

for (int i = 0; i < 15; i++)

{

pointArray[0] = new Point(random.Next(ImageFrame.Width), random.Next(ImageFrame.Height));

pointArray[1] = new Point(random.Next(ImageFrame.Width), random.Next(ImageFrame.Height));

graphics.DrawLine(pen, pointArray[0], pointArray[1]);

}

graphics.Dispose();

}

public void OutPutValidate(string ValidateCodeSession)

{

this.CreateValidate();

this.CreateImageGif();

HttpContext.Current.Session[ValidateCodeSession] = this.ValidateCode;

}

public byte ValidateCodeCount

{

get

{

return this.TrueValidateCodeCount;

}

set

{

if (value > 4)

{

this.TrueValidateCodeCount = value;

}

}

}

}