注册表单中的验证码超时时间

本文关键字:超时 时间 验证 注册表 表单 注册 | 更新日期: 2023-09-27 18:19:16

我目前在注册表格中使用MS Captcha。如果表单在一分钟内提交,它就可以完美地工作。但有时,在填写表单后,用户搜索要上传的文档,当他们最终提交表单时,他们得到服务器错误,如下所示:

[NullReferenceException:对象引用未设置为对象。MSCaptcha.CaptchaControl。ValidateCaptcha(字符串userEntry)+ 438

在提交按钮点击,我调用ValidateCaptcha如下:

Captcha1.ValidateCaptcha(txtCaptcha.Text.Trim());

有人能帮我处理这个异常吗?

注册表单中的验证码超时时间

如果你没有设置ErrorInputTooFast和ErrorInputTooSlow消息,当CaptchaMaxTimeout时间周期过去时,代码会抛出'NullReferenceException'。

我已经设置了以下属性,以及得到这个工作没有NullReferenceException

ErrorInputTooFast="图像文本输入太快。"errorinputooslow ="图像文本输入太慢。"

我的实现如下,我已经设置CaptchaMaxTimeout为20秒,看看这个问题是否仍然存在。

<uc:CaptchaControl ID="CaptchaUserControl" runat="server" Height="50px" ValidationGroup="PageValidationGroup"
                                        CustomValidatorErrorMessage="The text you entered did not match up with the image provided"
                                        Width="180px" CaptchaLength="5" FontColor="#000000" BackColor="#e6db55" NoiseColor="#26557f"
                                        CaptchaLineNoise="None" CaptchaFontWarping="Low" ImageTag="border='1'" CaptchaBackgroundNoise="Medium"
                                        ErrorInputTooFast="Image text was typed too quickly. " ErrorInputTooSlow="Image text was typed too slowly."
                                        CaptchaMaxTimeout="20" CaptchaMinTimeout="2" EnableViewState="False" />
                                   <asp:TextBox ID="CapthaTextBox" runat="server" MaxLength="10" Width="180px"  AutoCompleteType="Disabled"/>

背后的代码
 private void AppendValidationErrorMessage( string message)
    {
        var cv = new CustomValidator(); 
        cv.IsValid = false;
        cv.ErrorMessage = message;
        cv.ValidationGroup = "PageValidationGroup";
        this.Page.Validators.Add(cv);
    }
    protected void SubmitButtonClick(object sender, EventArgs e)
    {
        try
        {
            this.CaptchaUserControl.ValidateCaptcha(CapthaTextBox.Text.GetTrimValue());
            if (!this.CaptchaUserControl.UserValidated)
            {
                this.AppendValidationErrorMessage(this.CaptchaUserControl.CustomValidatorErrorMessage);
            }
        }
        catch (Exception)
        {
            this.AppendValidationErrorMessage(
                "Captcha expired please please reload the page.Note: please copy the data before refreshing data");
        }
        this.CapthaTextBox.Text = string.Empty;
        if (this.Page.IsValid) //&& this.CaptchaUserControl.UserValidated
        {
            //do something
        }
    }