asp.net - 我应该在 Visual Studio 中使用“WithEvents 变量”吗？

Question

一旦单击表单上的提交按钮，此代码应将这些表单字符串作为电子邮件发送。但是“EcampusIssuesSubmit.Click”给出了错误“handles 子句需要 withevents 变量”。以下是更多细节：

根据微软的 msdn，我需要添加一个“WithEvents 变量”，但过去我不需要这样做。
通常在 Visual Studio 中，当您单击按钮表单控件时，它会将您带到代码文件页面，但这里会显示消息“无法完成操作”。

我已经包含了 asp 代码以防万一，但我认为这不是我的错误的根源。

这是VB代码：

导入 System.Net.Mail

Partial Public Class EcampusMain
    Inherits System.Web.UI.Page

    Protected Sub EcampusIssuesSubmit_Click(sender As Object, e As EventArgs) Handles EcampusIssuesSubmit.Click
        ' Gather Variables
        Dim strfirstname As String = "First Name: " + firstname.Text
        Dim strlastname As String = "Last Name: " + lastname.Text
        Dim strnetid As String = "NetID: " + netid.Text
        Dim struin As String = "UIN: " + uin.Text
        Dim strphone As String = "Phone Number: " + phone.Text
        Dim strcurrentdate As String = "Date: " + currentdate.Text
        Dim strissueday As String = "Date of Issue: " + issueday.Text
        Dim strinstructorname As String = "Faculty/Instructor Name:" + instructorname.Text
        Dim stremail As String = "E-mail: " + email.Text
        Dim strcontactpref As String = "Preferred way to contact: " + contactpref.Text
        Dim strecampSect As String = "ECampus Class Name & Section:" + ecampSect.Text
        Dim strbldanroom As String = "Building & Room Number: " + bldanroom.Text
        Dim strcomputer As String = "Computer Number:" + computer.Text
        Dim strbrowser As String = "Web browser being used: " + browser.Text
        Dim strproblem As String = "problem Description: " + problem.Text
        Dim strhumanity As String = humanity.Text
        ' E-mail Prep
        Dim body As String = strfirstname & strlastname & strnetid & struin & strphone & strissueday & strinstructorname & stremail & strecampSect & strcomputer & strproblem
        Dim ourEmail As String = "Eforms@website.edu"   'Change back

        ' Check the humanity of the submitter 
        ' Change back Turtles!
        If strhumanity = "Turtles!" Then
            ' Send Email
            Using message As New MailMessage()
                message.From = New MailAddress(ourEmail.ToString())
                message.[To].Add(New MailAddress("george123@yahoo.com"))    'Change back
                message.Subject = "Ecampus Isses"
                message.Body = body
                Dim client As New SmtpClient()
                client.Host = "127.0.0.1"   'Change back
                client.Send(message)
            End Using

        Else
            'exit
        End If
    End Sub

End Class

这是asp代码

<%@ Page Language="VB" MasterPageFile="~/Site.master" AutoEventWireup="false" CodeFile="EcampusIssue.aspx.vb" Inherits="_Default"  %>

<asp:Content ID="Content2" ContentPlaceHolderID="HeadContent" Runat="Server">


    <style type="text/css">
        .auto-style1 {
            text-align: center;
        }
        .auto-style2 {
            text-align: center;
        }
    </style>


</asp:Content>
<asp:Content ID="Content3" ContentPlaceHolderID="MainContent" Runat="Server">
  <center>   <div>

        <h1 style="font-size: xx-large; text-align: center">
            Ecampus Problem Report</h1>
        <h2 style="font-size: x-large; text-align: left">
            <strong>Student/Faculty Contact Information</strong></h2>
        <p class="auto-style2">
            First Name<o:p>:</o:p></p>
        <p class="MsoNormal">
            <asp:TextBox ID="firstname" runat="server" Width="400"></asp:TextBox>
            <o:p></o:p>
        </p>
      <asp:RequiredFieldValidator id="vfirstname" runat="server"
  ControlToValidate="firstname"
  ErrorMessage="This is a required item."
  ForeColor="Red">
</asp:RequiredFieldValidator>
        <p class="auto-style2">
            Last Name<o:p>:</o:p></p>
        <p class="MsoNormal">
            <asp:TextBox ID="lastname" runat="server" Width="400"></asp:TextBox>
            <o:p></o:p>
        </p>
      <asp:RequiredFieldValidator id="vlastname" runat="server"
  ControlToValidate="lastname"
  ErrorMessage="This is a required item."
  ForeColor="Red">
</asp:RequiredFieldValidator>
        <p class="auto-style2">
            NetID<o:p>:</o:p></p>
        <p class="MsoNormal">
            <asp:TextBox ID="netid" runat="server" Width="400"></asp:TextBox>
            <o:p></o:p>
        </p>
      <asp:RequiredFieldValidator id="vnetid" runat="server"
  ControlToValidate="netid"
  ErrorMessage="This is a required item."
  ForeColor="Red">
</asp:RequiredFieldValidator>

        <p class="auto-style2">
            UIN<o:p>:</o:p></p>
        <p class="MsoNormal">
            <asp:TextBox ID="uin" runat="server" Width="400"></asp:TextBox>
            <o:p></o:p>
        </p>
      <asp:RequiredFieldValidator id="vuin" runat="server"
  ControlToValidate="uin"
  ErrorMessage="This is a required item."
  ForeColor="Red">
</asp:RequiredFieldValidator>

        <p class="auto-style2">
            Phone Number<o:p>:</o:p></p>
        <p class="MsoNormal">
            <asp:TextBox ID="phone" runat="server" Width="250px"></asp:TextBox>
            <o:p></o:p>
        </p>
      <asp:RequiredFieldValidator id="vphone" runat="server"
  ControlToValidate="phone"
  ErrorMessage="This is a required item."
  ForeColor="Red">
</asp:RequiredFieldValidator>

        <p class="auto-style2">
            Date<o:p>:</o:p></p>
        <p class="MsoNormal">
            <asp:TextBox ID="currentdate" runat="server" Width="249px"></asp:TextBox>
            <o:p></o:p>
        </p>
        <p class="auto-style2">
            Date of Issue<o:p>:</o:p></p>
        <p class="MsoNormal">
            <asp:TextBox ID="issueday" runat="server" Width="250px"></asp:TextBox>
            <o:p></o:p>
        </p>
        <p class="auto-style2">
            Faculty/Instructor Name<o:p>:</o:p></p>
        <p class="MsoNormal">
            <asp:TextBox ID="instructorname" runat="server" Width="400"></asp:TextBox>
            <o:p></o:p>
        </p>
            <asp:RequiredFieldValidator id="vinstructorname" runat="server"
  ControlToValidate="instructorname"
  ErrorMessage="This is a required item."
  ForeColor="Red">
</asp:RequiredFieldValidator>
        <p class="auto-style2">
            Your E-mail<o:p>:</o:p></p>
        <p class="MsoNormal">
            <asp:TextBox ID="email" runat="server" Width="400"></asp:TextBox>
            <o:p></o:p>
        </p>
      <asp:RequiredFieldValidator id="vemail" runat="server"
  ControlToValidate="email"
  ErrorMessage="This is a required item."
  ForeColor="Red">
</asp:RequiredFieldValidator>

        <p class="auto-style2">
            Preferred way to contact you?<o:p></o:p></p>
        <p class="auto-style1">

            <asp:RadioButtonList ID="contactpref" runat="server" BorderWidth="0px" Font-Bold="False" Font-Size="X-Small" Height="44px" Width="85px">
                <asp:ListItem>E-mail</asp:ListItem>
                <asp:ListItem>Phone</asp:ListItem>
            </asp:RadioButtonList>
            <o:p></o:p>
        </p>
        <p class="auto-style2">
            ECampus Class Name &amp; Section<o:p>:</o:p></p>
        <p class="MsoNormal">
            <asp:TextBox ID="ecampSect" runat="server" Width="400"></asp:TextBox>
            <o:p></o:p>
        </p>
      <asp:RequiredFieldValidator id="vecampSect" runat="server"
  ControlToValidate="ecampSect"
  ErrorMessage="This is a required item."
  ForeColor="Red">
</asp:RequiredFieldValidator>

        <p class="auto-style1">
            Building &amp; Room Number<o:p>:</o:p></p>
        <p class="MsoNormal">
            <asp:TextBox ID="bldanroom" runat="server" Width="301px"></asp:TextBox>
            <o:p></o:p>
        </p>
        <p class="auto-style1">
            Computer Number<o:p>:</o:p></p>
        <p class="MsoNormal">
            <asp:TextBox ID="computer" runat="server" Width="201px"></asp:TextBox>
            <o:p></o:p>
        </p>
        <p class="auto-style1">
            Web browser being used<o:p>:</o:p></p>
        <p class="auto-style1">
            <asp:DropDownList ID="browser" runat="server" Height="16px" Width="300px">
                <asp:ListItem>FireFox</asp:ListItem>
                <asp:ListItem>Chrome</asp:ListItem>
                <asp:ListItem>Internet Explorer</asp:ListItem>
                <asp:ListItem>Opera</asp:ListItem>
                <asp:ListItem>Other(Include in description)</asp:ListItem>
            </asp:DropDownList>
            <o:p></o:p>
        </p>

        <p class="auto-style1">
            Please describe your issue:<o:p></o:p></p>
        <p class="MsoNormal">
            <asp:TextBox ID="problem" runat="server" Width="400px" Height="200px"></asp:TextBox>
            &nbsp;&nbsp;&nbsp;
        </p>
        <p class="MsoNormal">
      <asp:RequiredFieldValidator id="vproblem" runat="server"
  ControlToValidate="problem"
  ErrorMessage="This is a required item."
  ForeColor="Red">
</asp:RequiredFieldValidator>


            <br />
            Please verify your humanity by typing &quot;Aggies!&quot; in the box below (case sensative):<br />
            <asp:TextBox ID="humanity" runat="server"></asp:TextBox>
            <o:p>
            <br />
            <asp:Button ID="SciFairSubmit" runat="server" Text="Submit" />
            </o:p>
        </p>


    </div>
   </center>  
</asp:Content>

score 0 · Accepted Answer

至少部分问题似乎是这样的：

Partial Public Class EcampusMain
    Inherits System.Web.UI.Page

    Protected Sub EcampusIssuesSubmit_Click(sender As Object, e As EventArgs) _
        Handles EcampusIssuesSubmit.Click

“handles 子句需要一个 withevents 变量”消息是说 VS 认为这EcampusIssuesSubmit不是实际点击的东西，即它没有事件。或者它已被重命名或此事件处理程序已被移动。

如果EcampusMain与按钮所在的类不同，那么您可能已经隐藏了单击事件。

对此进行测试并可能修复它的一种方法是将事件子更改为方法：

     Friend Sub EcampusSendIssue()
       ... all your code
     End Sub

然后从标准按钮单击调用它

    Sub Button_Name_Click(sender As Object, e As EventArgs) _
         Handles Button_Name.Click

        EcampusSendIssue
    End Sub

部分听起来像你有一个范围问题，所以下一个错误可能是点击事件将无法找到新的子EcampusSendIssue和/或新的子将无法找到名字，姓氏等。但至少你会知道问题出在哪里 - 如果不了解更多关于它的结构，很难说

asp.net - 我应该在 Visual Studio 中使用“WithEvents 变量”吗？

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