尝试附加文件时使用web Api for smtp mail获取错误

Question

这是我的代码，请帮助我。

[HttpGet]
public string sendmail( string email,string body, string attach)
{       

       MailMessage mail = new MailMessage();
       SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");
       mail.From = new MailAddress(email);
       mail.To.Add("sachinrameshgiri@gmail.com");
       mail.Subject = "Test Mail";
       System.Net.Mail.Attachment attachment;
       attachment = new System.Net.Mail.Attachment(attach );
       mail.Attachments.Add(attachment);

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

       return "success";
    }

使用jquery ajax从HTML页面调用它  $（document）.ready（function（）{

        $("#btn1").click(function () {
            $.getJSON("api/person/sendmail", { email: "sachingiri.bca@gmail.com", body: "hi this is sachin giri !!!A software developer",attach:"  "}, function (data) ....

这适用于发送邮件，但是html输入类型=“文件”不会返回上传路径，只返回文件名...所以附件不起作用。