Winform验证码工具

一、生成验证码并产生图片

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public class ValidateCodeCreator
{
    /// <summary>
    ///     产生验证码
    /// </summary>
    /// <param name="codeLength">验证码长度</param>
	/// <returns></returns>
	public string CreateCode(int codeLength)
	{
        string so =     "1,2,3,4,5,6,7,8,9,0,a,b,c,d,e,f,g,h,i,j,k,m,n,o,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z";
        string[] strArr = so.Split(',');
        string code = "";
        Random rand = new Random();
        for (int i = 0; i < codeLength; i++)
        {
            code += strArr[rand.Next(0, strArr.Length)];
        }
        return code;
    }
    /// <summary>
    ///     产生验证图片
    /// </summary>
    /// <param name="code"></param>
    public byte[] CreateCodeImage(string code)
    {
        Bitmap image = new Bitmap(code.Length * 22, 30);
        Graphics g = Graphics.FromImage(image);
        Random r = new Random();
        try
        {
            WebColorConverter ww = new WebColorConverter();
            string[] backgroundcolor = { "#F8F8FF", "#BBFFFF", "#E6E6FA", "#CAE1FF", "#FFFACD", "#B0E2FF" };
            g.Clear((Color)ww.ConvertFromString(backgroundcolor[r.Next(0,5)]));
            //数组存放字体  
            string[] fonts = { "黑体", "微软雅黑", "隶书", "楷体" };
            //数组存放颜色  
            Color[] codecolors = { Color.Red, Color.Black, Color.Blue, Color.Purple, Color.DarkGoldenrod, Color.Magenta, Color.Khaki };
            Color[] linecolors = { Color.Green, Color.DarkGreen, Color.SeaGreen, Color.DarkSlateBlue };
            //画字  
            for (int i = 0; i < code.Length; i++)
            {
                //指定座标  
                Point p = new Point(i * 20, 0);
                //画文字  
                g.DrawString(code[i].ToString(), new Font(fonts[r.Next(0,3)], 20, FontStyle.Italic), new SolidBrush(codecolors[r.Next(0,6)]), p);
            }
            //画线  
            int linecolormk = r.Next(0, 3);
            for (int j = 0; j < 12; j++)
            {
                Point p1 = new Point(r.Next(0, image.Width), r.Next(image.Height));
                Point p2 = new Point(r.Next(0, image.Width), r.Next(0, image.Height));
                g.DrawLine(new Pen(linecolors[linecolormk]), p1, p2);
            }
            //画像素点  
            for (int i = 0; i < 100; i++)
            {
                Point p1 = new Point(r.Next(0, image.Width), r.Next(image.Height));
                Point p2 = new Point(r.Next(0, image.Width), r.Next(0, image.Height));
                image.SetPixel(p1.X, p1.Y, Color.Black);
            }
            MemoryStream ms = new MemoryStream();
            image.Save(ms, ImageFormat.Gif);
            return ms.ToArray();
        }
        finally
        {
            g.Dispose();
            image.Dispose();
        }
    }

二、验证码刷新

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private void refreshcode()
{
    ValidateCodeCreator a = new ValidateCodeCreator();
    string code = a.CreateCode(6);
    pictureBox1.Image = ByteToImage(a.CreateCodeImage(code));
}

三、byte转image

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private System.Drawing.Image ByteToImage(byte[] btImage)
{
    if (btImage.Length == 0)
        return null;
    System.IO.MemoryStream ms = new System.IO.MemoryStream(btImage);
    System.Drawing.Image image = System.Drawing.Image.FromStream(ms);
    return image;
}