由于.Net Core中不再支持HttpPostedFileBase类，因此文件的上传可以使用IFormFile代替。
具体方法如下：
同样，先创建一个Model类来存放数据，
public class EmailModel { public string To { get; set; } public string Subject { get; set; } public string Body { get; set; } public IFormFile Attachment { get; set; } }
此处的附件AttachMent类型就是IFormFile。
然后创建Controller，
public class SendEmailController : Controller { public IActionResult Index() { return View(); } [HttpPost] public IActionResult Index(EmailModel model) { using (MailMessage mm = new MailMessage("XXX@gmail.com", model.To)) { mm.Subject = model.Subject; mm.Body = model.Body; if (model.Attachment.Length > 0) { string fileName = Path.GetFileName(model.Attachment.FileName); mm.Attachments.Add(new Attachment(model.Attachment.OpenReadStream(), fileName)); } mm.IsBodyHtml = false; using (SmtpClient smtp = new SmtpClient()) { smtp.Host = "smtp.gmail.com"; smtp.EnableSsl = true; NetworkCredential NetworkCred = new NetworkCredential("XXX@gmail.com", "p@ssw3rd"); smtp.UseDefaultCredentials = true; smtp.Credentials = NetworkCred; smtp.Port = 587; smtp.Send(mm); ViewBag.Message = "Email sent."; } } return View(); } }
在ASP.NET Core中不会自动创建对应的View文件夹，所以需要手动创建文件夹“Views/SendEmail”，并新建.cshtml文件如下，
@model CoreEmail.Models.EmailModel @{ Layout = null; } <!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width" /> <title>Index</title> <style type="text/css"> body { font-family: Arial; font-size: 10pt; } table th, table td { padding: 5px; } </style> </head> <body> <div> @using (Html.BeginForm("Index", "SendEmail", FormMethod.Post, new { enctype = "multipart/form-data" })) { <table border="0" cellpadding="0" cellspacing="0"> <tr> <td style="width: 80px"> To: </td> <td> @Html.TextBoxFor(model => model.To) </td> </tr> <tr> <td> Subject: </td> <td> @Html.TextBoxFor(model => model.Subject) </td> </tr> <tr> <td valign="top"> Body: </td> <td> @Html.TextAreaFor(model => model.Body, new { rows = "3", cols = "20" }) </td> </tr> <tr> <td> File Attachment: </td> <td> @Html.TextBoxFor(model => model.Attachment, new { type = "file" }) </td> </tr> <tr> <td></td> <td> <input type="submit" value="Send" /> </td> </tr> </table> <br /> <span style="color:green">@ViewBag.Message</span> } </div> </body> </html>
默认Route下通过https://localhost:#port/SendEmail访问。