格式化字符串作为电子邮件地址

Question

This SELECT returns the email address from the project owner:

var selectEmailData = "SELECT User.Email FROM Projects INNER JOIN User ON Projects.ProjectOwner = User.UserId WHERE ProjectId=@0";
var dataEmail = db.Query(selectEmailData, ProjectId);

@foreach (var row in dataEmail)
{
    @row.Email
}

But when I tried this:

var mailTo = dataEmail.ToString();

To send an email:

WebMail.Send(
    to: mailTo,
    subject: "Hello there!",
    body: "Your project is ready."
);

I got this: The specified string is not in the form required for an e-mail address.

Whats wrong with this code?

Answer 1

I am pretty sure…

var dataEMail = db.Query(…) would return a collection not a string.

SO...

var mailTo = dataEmail.ToString();

would return something Like "System.Collections.Generic......"

I am guessing you may want something like this

var selectEmailData = "SELECT User.Email FROM Projects INNER JOIN User  ON Projects.ProjectOwner = User.UserId WHERE ProjectId=@0";
var allEmails = db.Query(selectEmailData, ProjectId);

@foreach (var row in allEmails)
{
  WebMail.Send(
  to: @row.Email,
  subject: "Hello there!",
  body: "Your project is ready."
)

Answer 2

Validation?

Regex regex = new Regex(@"^([\w\.\-]+)@([\w\-]+)((\.(\w){2,3})+)$"); 
Match match = regex.Match(email); 
if (match.Success)
{
//Send email
}
else
{
//Bad email
}

Other way:

try
{
MailAdress email = new MailAddress(<enter here string>);
}
catch (FormatException fe)
{
//Bad email
}