Question

我是.NET框架的新手，正在查看一个简单的联系表单，该表单应该在单击按钮时提交电子邮件并且遇到问题。

首先，我启动了一个新项目（使用母版页，如果这很重要）并且更改后将default.aspx的名称更改为SendMail.aspx。然后，我只是将代码复制并粘贴到我创建的项目中。

我在SendMail的标记中收到多个错误和警告，告诉我，例如'Element' Button is not a known element. This can occur if there is a compilation error in the web site for the web.config file is missing。 web.config文件不会丢失。但是，对于页面上的每个asp控件，我都会收到警告

我也遇到编译错误，告诉我无法打开源文件。然后，编译器列出名为Default.aspx.cs的文件路径。这是我在Visual Studio中更改的文件的名称，但编译器仍在尝试读取该文件名。

这里发生了什么，以便将来解决这些问题？

标记：

<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"
    CodeBehind="SendMail.aspx.cs" Inherits="SmtpExample._Default" %>
<asp:Content runat="server" ContentPlaceHolderID="HeadContent">
<asp:Panel ID="Panel1" runat="server" DefaultButton="btnSubmit">
    <p>
        Please Fill the Following to Send Mail.</p>
    <p>
        Your name:
        <asp:RequiredFieldValidator ID="RequiredFieldValidator11" runat="server" ErrorMessage="*"
            ControlToValidate="YourName" ValidationGroup="save" /><br />
        <asp:TextBox ID="YourName" runat="server" Width="250px" /><br />
        Your email address:
        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ErrorMessage="*"
            ControlToValidate="YourEmail" ValidationGroup="save" /><br />
        <asp:TextBox ID="YourEmail" runat="server" Width="250px" />
        <asp:RegularExpressionValidator runat="server" ID="RegularExpressionValidator23"
            SetFocusOnError="true" Text="Example: username@gmail.com" ControlToValidate="YourEmail"
            ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*" Display="Dynamic"
            ValidationGroup="save" /><br />
        Subject:
        <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ErrorMessage="*"
            ControlToValidate="YourSubject" ValidationGroup="save" /><br />
        <asp:TextBox ID="YourSubject" runat="server" Width="400px" /><br />
        Your Question:
        <asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server" ErrorMessage="*"
            ControlToValidate="Comments" ValidationGroup="save" /><br />
        <asp:TextBox ID="Comments" runat="server" 
                TextMode="MultiLine" Rows="10" Width="400px" />
    </p>
    <p>
        <asp:Button ID="btnSubmit" runat="server" Text="Send" 
                    OnClick="Button1_Click" ValidationGroup="save" />
    </p>
</asp:Panel>
<p>
    <asp:Label ID="DisplayMessage" runat="server" Visible="false" />
</p>  
</asp:Content>
<asp:Content ID="Content1" runat="server" contentplaceholderid="MainContent">
</asp:Content>

代码背后的代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;


namespace SmtpExample
{
    public partial class _SendMail : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }
        protected void SendMail()
        {
            // Gmail Address from where you send the mail
            var fromAddress = "Gmail@gmail.com";
            // any address where the email will be sending
            var toAddress = YourEmail.Text.ToString();
            //Password of your gmail address
            const string fromPassword = "Password";
            // Passing the values and make a email formate to display
            string subject = YourSubject.Text.ToString();
            string body = "From: " + YourName.Text + "\n";
            body += "Email: " + YourEmail.Text + "\n";
            body += "Subject: " + YourSubject.Text + "\n";
            body += "Question: \n" + Comments.Text + "\n";
            // smtp settings
            var smtp = new System.Net.Mail.SmtpClient();
            {
                smtp.Host = "smtp.gmail.com";
                smtp.Port = 587;
                smtp.EnableSsl = true;
                smtp.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
                smtp.Credentials = new NetworkCredential(fromAddress, fromPassword);
                smtp.Timeout = 20000;
            }
            // Passing values to smtp object
            smtp.Send(fromAddress, toAddress, subject, body);
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            try
            {
                //here on button click what will done 
                SendMail();
                DisplayMessage.Text = "Your Comments after sending the mail";
                DisplayMessage.Visible = true;
                YourSubject.Text = "";
                YourEmail.Text = "";
                YourName.Text = "";
                Comments.Text = "";
            }
            catch (Exception) { }
        }
    }
}

Answer 1

您将元素放在ContentPlaceHolderID =“HeadContent”中，它必须位于contentplaceholderid =“MainContent”

更新

我看到您重命名default.aspx文件以发送SendMail.aspx，这将导致部分类default.aspx.cs和default.aspx.design.cs中的错误。这样做创建新页面SendMail.aspx并将您的代码复制到ContentPlaceHolderID =“HeadContent”，右键单击页面i解决方案资源管理器单击设置为起始页

源文件'FilePathHere'无法打开未指定的错误.NET 4.0

1 个答案: