C# 编译时出错："；应为类、委托、枚举、接口或结构；

这个代码有什么问题？此程序旨在复制文件并通过电子邮件发送到电子邮件地址，但实际上并非如此

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Net.Mail;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {

        }
    }

    public void email_send()
   {
    MailMessage mail = new MailMessage();
    SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");
    mail.From = new MailAddress("your mail@gmail.com");
    mail.To.Add("to_mail@gmail.com");
    mail.Subject = "Test Mail - 1";
    mail.Body = "mail with attachment";

    System.Net.Mail.Attachment attachment;
    attachment = new System.Net.Mail.Attachment("c:/textfile.txt");
    mail.Attachments.Add(attachment);

    SmtpServer.Port = 587;
    SmtpServer.Credentials = new System.Net.NetworkCredential("your mail@gmail.com", "your password");
    SmtpServer.EnableSsl = true;

    SmtpServer.Send(mail);

}
}

这显示了以下编译器错误：

应为类、委托、枚举、接口或结构

应为类、委托、枚举、接口或结构

应为类、委托、枚举、接口或结构

应为类、委托、枚举、接口或结构

应为类、委托、枚举、接口或结构

应为类、委托、枚举、接口或结构

类型或命名空间定义，或应为文件结尾 应为类、委托、枚举、接口或结构

---

对此我能做些什么？

首先，您的方法不在类中。将其复制到form 1类中，它应该会清除任何intellisense问题。

类中未定义电子邮件发送方法。

电子邮件发送（）方法不在类声明范围内。它仍然在名称空间中，但您还必须将其放置在类中。此外，在任何时候都不会调用该方法。这是死代码

---

将该方法移动到类定义中，然后从Form_Load（）中调用该方法，这与其他人所说的完全一样，但剪切/粘贴此方法后，您应该更正错误：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.
using System.Net;
using System.Net.Mail;

namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {

    }

    private void button1_Click(object sender, EventArgs e)
    {

    }

    public void email_send()
    {
        MailMessage mail = new MailMessage();
        SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");
        mail.From = new MailAddress("your mail@gmail.com");
        mail.To.Add("to_mail@gmail.com");
        mail.Subject = "Test Mail - 1";
        mail.Body = "mail with attachment";

        System.Net.Mail.Attachment attachment;
        attachment = new System.Net.Mail.Attachment("c:/textfile.txt");
        mail.Attachments.Add(attachment);

        SmtpServer.Port = 587;
        SmtpServer.Credentials = new System.Net.NetworkCredential("your mail@gmail.com", "your password");
        SmtpServer.EnableSsl = true;

        SmtpServer.Send(mail);

    }
}
}

如您所见，您的

email\u send

方法现在位于类声明中