public void Get(string name)
{
var response = HttpContext.Current.Response;
var code = VcManager.CreateValidateCode();
if (CacheUtils.Exists($"SiteServer.API.Controllers.V1.CaptchaController.{code}"))
{
code = VcManager.CreateValidateCode();
}
CookieUtils.SetCookie("SS-" + name, code, DateTime.Now.AddMinutes(10));
response.BufferOutput = true; //特别注意
response.Cache.SetExpires(DateTime.Now.AddMilliseconds(-1)); //特别注意
response.Cache.SetCacheability(HttpCacheability.NoCache); //特别注意
response.AppendHeader("Pragma", "No-Cache"); //特别注意
response.ContentType = "image/png";
var validateimage = new Bitmap(130, 53, PixelFormat.Format32bppRgb);
var r = new Random();
var colors = Colors[r.Next(0, 5)];
var g = Graphics.FromImage(validateimage);
g.FillRectangle(new SolidBrush(Color.FromArgb(240, 243, 248)), 0, 0, 200, 200); //矩形框
g.DrawString(code, new Font(FontFamily.GenericSerif, 28, FontStyle.Bold | FontStyle.Italic), new SolidBrush(colors), new PointF(14, 3)); //字体/颜色
var random = new Random();
for (var i = 0; i < 25; i++)
{
var x1 = random.Next(validateimage.Width);
var x2 = random.Next(validateimage.Width);
var y1 = random.Next(validateimage.Height);
var y2 = random.Next(validateimage.Height);
g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
}
for (var i = 0; i < 100; i++)
{
var x = random.Next(validateimage.Width);
var y = random.Next(validateimage.Height);
validateimage.SetPixel(x, y, Color.FromArgb(random.Next()));
}
g.Save();
var ms = new MemoryStream();
validateimage.Save(ms, ImageFormat.Png);
response.ClearContent();
response.BinaryWrite(ms.ToArray());
response.End();
}
protected void Page_Load(object sender, EventArgs e)
{
var cookieName = Request.QueryString["cookieName"];
var validateCode = VcManager.CreateValidateCode();
CookieUtils.SetCookie(cookieName, validateCode, DateTime.Now.AddDays(1));
Response.BufferOutput = true; //特别注意
Response.Cache.SetExpires(DateTime.Now.AddMilliseconds(-1)); //特别注意
Response.Cache.SetCacheability(HttpCacheability.NoCache); //特别注意
Response.AppendHeader("Pragma", "No-Cache"); //特别注意
Response.ContentType = "image/png";
ValidateCode(validateCode);
}