我是 .NET 框架的新手，正在查看一个简单的联系表单，当单击按钮并遇到问题时，该表单应提交电子邮件。
首先，我开始了一个新项目（使用母版页，如果这很重要）并将 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 文件没有丢失。但是，对于页面上的每个 asp 控件，我都会收到警告
我还收到一个编译器错误，它告诉我无法打开源文件。然后编译器列出名称为 Default.aspx.cs 的文件路径。这是我在 Visual Studio 中更改的文件名，但编译器仍在尝试读取该文件名。
这是怎么回事，所以我可以在将来解决这些问题？
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>
后面的代码：
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) { }
}
}
}