如何使用asp.net mvc c#向用户发送电子邮件确认邮件

Question

I have build an application and want to send user a confirmation email after registration.I have taken ActivationCode value by guid=new.guid(); but it don't get store in the database and after debugging I evaluate the value it says :The name 'ActivationCode' does not exist in the current context.

public ActionResult Activation()
{
    ViewBag.Message = "Invalid Activation code.";//This get outputted always
    if (RouteData.Values["id"] != null)
    {
        Guid activationcode = new Guid(RouteData.Values["id"].ToString());
        IPHISEntities usersEntities = new IPHISEntities();
        User userActivation = usersEntities.Users.Where(p => p.ActivationCode == activationcode).FirstOrDefault();
        if (userActivation != null)//this condition gets true
        {
            usersEntities.Users.Remove(userActivation);
            try {
                usersEntities.SaveChanges();
            }
            catch (DbEntityValidationException e)
            {
                Console.WriteLine(e);
            }
            ViewBag.Message = "Activation successful.";
        }
    }

    return View();
}

private void SendActivationEmail(User user)
{
    Guid activationcode = Guid.NewGuid();
    IPHISEntities usersEntities = new IPHISEntities();
    usersEntities.Users.Add(new User
    {
        UserId = user.UserId,
       ActivationCode = activationcode
    });
    try
    {
        usersEntities.SaveChanges();
    }
    catch (DbEntityValidationException e)
    {
        Console.WriteLine(e);
    }
    using (MailMessage mm = new MailMessage("xyzz@gmail.com", user.EmailAddress))
    {
        mm.Subject = "Account Activation";
        string body = "Hello " + user.FirstName + ",";
        body += "<br /><br />Please click the following link to activate your account";
        body += "<br /><a href = '" + string.Format("{0}://{1}/User/Activation/{2}", Request.Url.Scheme, Request.Url.Authority, activationcode) + "'>Click here to activate your account.</a>";
        body += "<br /><br />Thanks";
        mm.Body = body;
        mm.IsBodyHtml = true;
        SmtpClient smtp = new SmtpClient();
        smtp.Host = "smtp.gmail.com";
        smtp.EnableSsl = true;
        NetworkCredential NetworkCred = new NetworkCredential("xyzz@gmail.com", "********");
        smtp.UseDefaultCredentials = true;
        smtp.Credentials = NetworkCred;
        smtp.Port = 587;
        smtp.Send(mm);
    }


//**User.cs**:
namespace ConnectionSQL_webAPI_.Models
{

    using System;
    using System.Collections.Generic;

    public partial class User
    {
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
    public User()
    {
        this.Answers = new HashSet<Answer>();
        this.Appointments = new HashSet<Appointment>();
        this.DoctorInfoes = new HashSet<DoctorInfo>();
        this.Payments = new HashSet<Payment>();
        this.UserLoginDetails = new HashSet<UserLoginDetail>();
    }


    public int UserId { get; set; }

    public string FirstName { get; set; }

    public string MiddleName { get; set; }

    public string LastName { get; set; }

    public string EmailAddress { get; set; }

    public System.Guid ActivationCode { get; set; }

    public string Password { get; set; }

    public string PhoneNumber { get; set; }

    public string UserUniqueId { get; set; }

    public Nullable<int> UserTypeId { get; set; }

    public Nullable<int> AddressId { get; set; }

    public Nullable<System.DateTime> CreatedDate { get; set; }

}

Expected Output

Activation Successful

Actual Output

Invalid Activation code

Answer 1

Take ActivationCode in different table and make it uniqueidentifier in database.Now update your database in the model and check for the ActivationCode Property if it is Guid and Execute the above code. Result Output: Activation successfull

Answer 2

添加

using System.Runtime.Remoting;