public CaptchaCode(CaptchaOptions options)
{
CaptchaOptions = options;
int seekSeek = unchecked ((int)DateTime.Now.Ticks);
_rand = new Random(seekSeek);
Text = GenerateRandomText();
}
private static string CreateImgTag(CaptchaOptions options)
{
var sb = new StringBuilder("<a href=\"javascript:void(0)\"><img src=\"");
sb.Append("/Captcha/GetCaptchaCode");
sb.Append("\" alt=\"MvcCaptcha\" title=\"刷新图片\" width=\"");
sb.Append(options.Width);
sb.Append("\" height=\"");
sb.Append(options.Height);
sb.Append("\" border=\"0\" onclick=\"this.src = '/Captcha/GetCaptchaCode?d=' + Math.random(); \"/></a>");
return(sb.ToString());
}
private static MvcHtmlString GetCaptchaCode(this HtmlHelper helper, string actionName, string controllerName, CaptchaOptions options)
{
if (options == null)
{
options = new CaptchaOptions();
}
var image = new CaptchaCode(options);
HttpContext.Current.Session.Add(
"CaptchaCode",
image);
var url = new UrlHelper(helper.ViewContext.RequestContext);
var sb = new StringBuilder(1500);
const string copyrightText = "\r\n<!-- MyCaptcha 1.0 @Leiyang -->\r\n";
sb.Append(copyrightText);
sb.Append(CreateImgTag(options));
sb.Append(copyrightText);
return(MvcHtmlString.Create(sb.ToString()));
}
public static MvcHtmlString GetCaptchaCode(this HtmlHelper helper, CaptchaOptions options)
{
return(GetCaptchaCode(helper, "MvcCaptchaImage", "_MvcCaptcha", options));
}