Question

我有一个查询，用于在ASP.net中发送电子邮件，但在现有代码中，我只能使用电子邮件中查询的两列：

电子邮件（电子邮件）

名字（电子邮件）。

emails[Convert.ToString(reader["email"])] = Convert.ToString(reader["FirstName"]);

现在我想改进代码，以便我可以使用

电子邮件
姓
计划

这是我之前检索两列

  SqlDataReader reader;

  string sendMessage = "SELECT aspnet_Membership.Email,      User_Profile.FirstName, User_Profile.Program FROM aspnet_Membership join User_Profile on User_Profile.UserId = aspnet_Membership.UserId";


        using (SqlConnection myConnection = new SqlConnection(connectionString))
        {
            myConnection.Open();
            SqlCommand myCommand = new SqlCommand(sendMessage, myConnection);
            myCommand.Parameters.AddWithValue("@UserId", currentUserId);
            myCommand.Parameters.AddWithValue("@ProjectId", querystring);

            ArrayList emailArray = new ArrayList();
            reader = myCommand.ExecuteReader();

            Dictionary<string, string> emails = new Dictionary<string, string>();

            while (reader.Read())
            {
                emails[Convert.ToString(reader["email"])] = Convert.ToString(reader["FirstName"]);
            }

            foreach (string email in emails.Keys)
            {
              //email codes
            }

        }

这就是我试过的

    public class EmailCode
    {
        public string Email { get; set; }
        public string FirstName { get; set; }
        public string Program { get; set; }
    }


    protected void emailtest_Click(object sender, EventArgs e)
    {
        string connectionString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;

        SqlDataReader reader;
        string sendMessage = "SELECT aspnet_Membership.Email,      User_Profile.FirstName, User_Profile.Program FROM aspnet_Membership join User_Profile on User_Profile.UserId = aspnet_Membership.UserId";
        using (SqlConnection myConnection = new SqlConnection(connectionString))
        {
            myConnection.Open();
            SqlCommand myCommand = new SqlCommand(sendMessage, myConnection);


            ArrayList emailArray = new ArrayList();
            reader = myCommand.ExecuteReader();



            var emails = new List<EmailCode>();

            while (reader.Read())
            {
                emails.Add(new EmailCode
                {
                    Email = Convert.ToString(reader["email"]),
                    FirstName = Convert.ToString(reader["FirstName"]),
                    Program = Convert.ToString(reader["Program"])
                });
            }

            foreach (EmailCode email in emails)
            {

                const string username = "";
                const string password = "
                SmtpClient smtpclient = new SmtpClient();
                MailMessage mail = new MailMessage();
                MailAddress fromaddress = new 
                smtpclient.Host = "";
                smtpclient.Port = 25;
                mail.From = fromaddress;
                mail.To.Add(Email);
                mail.Subject = ("");
                //mail.Attachments.Add(new mail);
                mail.IsBodyHtml = true;
                mail.Body = Hello" + HttpUtility.HtmlEncode(FirstName) + " you are studying " + HttpUtility.HtmlEncode(Program) + ";

                smtpclient.EnableSsl = false;
                smtpclient.DeliveryMethod = SmtpDeliveryMethod.Network;
                smtpclient.Credentials = new System.Net.NetworkCredential(username, password);
                smtpclient.Send(mail);
            }

Answer 1

您有两种选择。您可以一起停止使用字典，也可以使用字典，其值为类，例如Tuple。以下是使用新类型的示例。更新SQL查询以返回Program数据后，您可以执行以下操作。

//Create a new class for our Poco
public class EmailCode
{
    public string Email {get; set;}
    public string FirstName {get; set;}
    public string Program {get;set;}
}

var emails = new List<EmailCode>();

while (reader.Read())
{
    emails.Add(new EmailCode {Email = Convert.ToString(reader["email"]),
        FirstName = Convert.ToString(reader["FirstName"]),
        Program =  Convert.ToString(reader["Program"])
        });
}

foreach (EmailCode email in emails)
{
  //email codes
}

在你的＆＃34;我尝试了什么＆＃34;编辑，你需要访问从循环中公开的电子邮件变量的属性，像这样（更不用说你有语法错误）：

mail.Body = "Hello" + HttpUtility.HtmlEncode(email.FirstName) + " you are studying " + HttpUtility.HtmlEncode(email.Program);

smtpclient.EnableSsl = false;
smtpclient.DeliveryMethod = SmtpDeliveryMethod.Network;
smtpclient.Credentials = new System.Net.NetworkCredential(username, password);
smtpclient.Send(mail);

在查询中使用三个以上的值来发送电子邮件

1 个答案: