将Captcha集成到.NET电子邮件表单中

时间：2015-01-05 22:37:39

标签： .net vb.net email captcha

我无法将CAPTCHA集成到我正在使用的表单中。我几乎没有.NET经验，所以任何帮助将不胜感激！我终于找到了一个有效的联系表格（当使用我个人域名中的电子邮件地址时 - 由于某些原因似乎无法使用gmail）。

我设法让它具有风格和功能，但它需要一个CAPTCHA来阻止垃圾邮件进入。我在http://www.tipstricks.org/找到了一个预制的CAPTCHA表单，它本身很好用，但我真的不确定将其与下面的表单集成。我可以让CAPTCHA单独工作，并且表单可以单独工作，但我似乎无法弄清楚如何让CAPTCHA验证并提交表单。

现在，当我填写表格并提交表格时，我收到一条绿色确认信，说明信息已发送，但有一条红色信息说CAPTCHA失败。无论CAPTCHA字段中填写了什么，该消息都会通过。

坦率地说，我会对任何CAPTCHA代码感到满意，而不仅仅是我下载的代码。如果你们中的任何人有更好的代码或者将CAPTCHA合并到这个表单中的方式，我会很乐意使用它。

以下是我用于表单的内容。如果我需要提供更多详细信息，请与我们联系。正如我所说，任何帮助将不胜感激！

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="test.aspx.vb" Inherits="custom_aspnet_test" %>
<%@ Import Namespace="System.Web.Mail" %>
<script runat="server">   

   Sub btnSubmit_Click(sender as object, e as EventArgs)

        Dim objEMail As New MailMessage()

        objEMail.To = "myemail@email.com"
        objEmail.From = txtFrom.Text

  objEmail.Subject = "Contact Form"
  objEmail.Body = "IP: " & Request.ServerVariables("REMOTE_ADDR") & vbcrlf & "Date/Time: " &Now & vbcrlf & "Name: " &txtName.Text & vbcrlf & "Email: " &txtFrom.Text & vbcrlf & "Phone: " &txtPhone.Text & vbcrlf & "Comments: " &txtBody.Text
  objEmail.Priority = MailPriority.High
        SmtpMail.SmtpServer = "smtp.address.com"

  try
   SmtpMail.Send(objEMail)
   Response.Write("<font color='green'><strong>Thank you for contacting us. We will respond shortly.</strong></font>") 

  catch exc as Exception
   Response.Write("<font color='red'><strong>Send failure: </strong></font>" + exc.ToString())
  End Try
    End Sub
</script>
<html>
<head>
<title>Contact Form</title>
</head>
<body>

<form id="ContactMain" runat="server">
<table border="0" align="center" cellpadding="3" cellspacing="0" width="100%">
     <tr>
      <td valign="top" class="form-input" colspan="2">
          <label class="form-label-left">Name</label>
      <asp:TextBox runat="server" class="form-textbox" ID="txtName"></asp:TextBox>      
      </td>
     </tr>
     <tr>
       <td valign="top" class="form-input" colspan="2">
          <label class="form-label-left">Email <font color="red">*</font></label>
            <asp:TextBox runat="server" class="form-textbox" ID="txtFrom" ></asp:TextBox>    
            <asp:RequiredFieldValidator runat=server 
               ControlToValidate=txtFrom
               ErrorMessage="Please enter a valid Email address">
            </asp:RequiredFieldValidator>                    
        </td>
     </tr>
     <tr>
      <td valign="top" class="form-input" colspan="2">
          <label class="form-label-left">Phone</label>        
              <asp:TextBox runat="server" class="form-textbox" ID="txtPhone" ></asp:TextBox>
    </td>
     </tr>
     <tr>
       <td valign="top" class="form-input">
          <label class="form-label-left">Comments <font color="red">*</font></label>
         <asp:TextBox runat="server" TextMode="MultiLine" rows="6" cols="40" class="form-textarea" ID="txtBody"></asp:TextBox>
         <asp:RequiredFieldValidator runat=server 
            ControlToValidate=txtBody
            ErrorMessage="Please let us know what we can help you with">
         </asp:RequiredFieldValidator>    
       </td>
       </tr>
       <tr>
        <td colspan="2" valign="top" class="form-line">
            <asp:PlaceHolder ID="phTest" runat="server" Visible="true">
            <img src="captcha.ashx" id="imgCaptcha" />&nbsp;<a href="javascript:void(0);" onclick="RefreshImage('imgCaptcha');">Refresh</a><br />
            Write the characters in the image above<br />
            <asp:TextBox ID="txtCaptcha" runat="server"></asp:TextBox><br />
            <asp:Button Runat = server ID = btnSubmit OnClick = btnSubmit_Click Text = "Submit" class="form-submit-button"></asp:Button>
            </asp:PlaceHolder>
            <asp:PlaceHolder ID="phResult" runat="server" Visible="false">
            <p><asp:Label ID="lblResult" runat="server" Font-Bold="true"></asp:Label></p>
            <asp:Button ID="btnRetry" runat="server" Text="Take another test" />
            </asp:PlaceHolder>
        </td>
     </tr>
     </table>
</form>

</body>
</html>

以下是“CodeFile”文件中的代码引用：

Partial Class custom_aspnet_test
    Inherits System.Web.UI.Page

    Protected Sub btnSubmit_Click(sender As Object, e As System.EventArgs) Handles btnSubmit.Click
        If IsNothing(Session("ASPCAPTCHA")) OrElse Session("ASPCAPTCHA").ToString.Trim.Length = 0 Then
            lblResult.Text = "This test has expired."
            lblResult.ForeColor = Drawing.Color.Red
        Else
            Dim TestValue As String = txtCaptcha.Text.Trim.ToUpper(System.Globalization.CultureInfo.CreateSpecificCulture("en-US"))
            If StrComp(TestValue, Session("ASPCAPTCHA").ToString.Trim, CompareMethod.Text) = 0 Then
                lblResult.Text = "CAPTCHA PASSED"
                lblResult.ForeColor = Drawing.Color.Green
            Else
                lblResult.Text = "CAPTCHA FAILED"
                lblResult.ForeColor = Drawing.Color.Red
            End If
            '//IMPORTANT: You must remove session value for security after the CAPTCHA test//
            Session.Remove("ASPCAPTCHA")
            '//////////
        End If

        phTest.Visible = False
        phResult.Visible = True
    End Sub

    Protected Sub btnRetry_Click(sender As Object, e As System.EventArgs) Handles btnRetry.Click
        txtCaptcha.Text = ""
        phTest.Visible = True
        phResult.Visible = False
    End Sub
End Class

1 个答案:

答案 0 :(得分：1)

问题是你有两个不同的地方你回应btnSubmit。其中一个是在.aspx文件的脚本标记中。这是您发送电子邮件的地方。另一个地方是btnSubmit_Click方法中的代码隐藏文件。那是你检查CAPTCHA的地方。

您已连接按钮以触发两个事件。他们两个都在开火，这就是为什么你总能得到两个结果。

您需要将电子邮件代码移动到btnSubmit_Click中，以便CAPTCHA成功后面的代码。

以下是CAPTCHA通过时调用的send email方法的更新代码。此外，您需要从.aspx文件中删除发送电子邮件代码，并从btnSubmit按钮声明中删除此属性： OnClick = btnSubmit_Click 

Imports System.Web.Mail

Partial Class test
    Inherits System.Web.UI.Page

    Protected Sub btnSubmit_Click(sender As Object, e As System.EventArgs) Handles btnSubmit.Click
        If IsNothing(Session("ASPCAPTCHA")) OrElse Session("ASPCAPTCHA").ToString.Trim.Length = 0 Then
            lblResult.Text = "This test has expired."
            lblResult.ForeColor = Drawing.Color.Red
        Else
            Dim TestValue As String = txtCaptcha.Text.Trim.ToUpper(System.Globalization.CultureInfo.CreateSpecificCulture("en-US"))
            If StrComp(TestValue, Session("ASPCAPTCHA").ToString.Trim, CompareMethod.Text) = 0 Then
                lblResult.Text = "CAPTCHA PASSED"
                lblResult.ForeColor = Drawing.Color.Green
                ' The CAPTCHA passes so send the email
                Me.SendEmail()
            Else
                lblResult.Text = "CAPTCHA FAILED"
                lblResult.ForeColor = Drawing.Color.Red
            End If
            '//IMPORTANT: You must remove session value for security after the CAPTCHA test//
            Session.Remove("ASPCAPTCHA")
            '//////////
        End If

        phTest.Visible = False
        phResult.Visible = True
    End Sub

    ''' <summary>
    ''' This was the code you had in the aspx file.
    ''' </summary>
    ''' <remarks></remarks>
    Private Sub SendEmail()
        Dim objEMail As New MailMessage()

        objEMail.To = "myemail@email.com"
        objEMail.From = txtFrom.Text

        objEMail.Subject = "Contact Form"
        objEMail.Body = "IP: " & Request.ServerVariables("REMOTE_ADDR") & vbCrLf & "Date/Time: " & Now & vbCrLf & "Name: " & txtName.Text & vbCrLf & "Email: " & txtFrom.Text & vbCrLf & "Phone: " & txtPhone.Text & vbCrLf & "Comments: " & txtBody.Text
        objEMail.Priority = MailPriority.High
        SmtpMail.SmtpServer = "smtp.address.com"

        Try
            SmtpMail.Send(objEMail)
            Response.Write("<font color='green'><strong>Thank you for contacting us. We will respond shortly.</strong></font>")

        Catch exc As Exception
            Response.Write("<font color='red'><strong>Send failure: </strong></font>" + exc.ToString())
        End Try
    End Sub


    Protected Sub btnRetry_Click(sender As Object, e As System.EventArgs) Handles btnRetry.Click

        txtCaptcha.Text = ""
        phTest.Visible = True
        phResult.Visible = False
    End Sub


End Class
相关问题
最新问题