MvcCaptcha 示例 — Ajax加载

View：

@using Webdiyer.WebControls.Mvc
@using (Html.BeginForm())
{
    <div>@ViewData["Message"]</div>
    @Html.ValidationSummary()
    @Html.MvcCaptcha(new MvcCaptchaOptions { DelayLoad = true, 
    ValidationInputBoxId = "_mvcCaptchaText", 
    CaptchaImageContainerId = "captchaImage" })
    <span id="captchaImage"></span>
    <br />
    <div>请点击右边的文本框，输入上边图片中的四个字母或数字：</div>
    <input type="text" name="_mvcCaptchaText" id="_mvcCaptchaText" />
    <input type="submit" value="提交" />
}

Controller：

        [OutputCache(Duration = 600, VaryByParam = "none", VaryByHeader = "none")]
        public ActionResult Ajax()
        {
            return View();
        }

        [HttpPost, ValidateMvcCaptcha()]
        public ActionResult Ajax(FormCollection values)
        {
            if (ModelState.IsValid)
            {
                //在这里执行表单提交成功后的操作
                ViewData["Message"] = "<span class="\"success\">验证通过，表单提交成功！</span>";
            }
            else
                ViewData["Message"] = "<span class="\"error\">验证未通过，表单提交失败！</span>";
            return View();
        }