public IActionResult GetCaptchaImage()
{
int width = 120;
int height = 36;
var captchaCode = CaptchaHelper.GenerateCaptchaCode();
var result = CaptchaHelper.GenerateCaptchaImage(width, height, captchaCode);
HttpContext.Session.SetString("CaptchaCode", result.CaptchaCode);
Stream s = new MemoryStream(result.CaptchaByteData);
return(new FileStreamResult(s, "image/png"));
}
