在ASP.Net登记表MS验证码超时时间

问题描述

我目前使用MS验证码的登记表。如果形式在一分钟内提交了它完美的作品。但有时，填写表单用户，然后搜索文件上传，之后当他们终于提交表单，他们得到服务器错误如下：

On submit button click, I call the ValidateCaptcha as below:

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

Can someone help me in handling this exception? Thanks in advance.

解决方案

It has been seen that if you have not set ErrorInputTooFast and ErrorInputTooSlow messages the code throws 'NullReferenceException' when the CaptchaMaxTimeout time period has passed.

I have set the following properties as well to get this working without NullReferenceException

ErrorInputTooFast="Image text was typed too quickly."ErrorInputTooSlow="Image text was typed too slowly."

my implementation is as below and i have set CaptchaMaxTimeout as 20 sec to see if this issue persists.

<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"/>

code behind

 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

        }
    }

这篇关于在ASP.Net登记表MS验证码超时时间的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！