无法使用C＃向多个地址/收件人发送电子邮件 [英] Unable to send an email to multiple addresses/recipients using C#

问题描述

我正在使用以下代码，它只发送一封电子邮件 - 我必须将邮件发送到多个地址。

I am using the below code, and it only sends one email - I have to send the email to multiple addresses.

要获取多个电子邮件，我使用：

For getting more than one email I use:

string connectionString = ConfigurationManager.ConnectionStrings["email_data"].ConnectionString;
OleDbConnection con100 = new OleDbConnection(connectionString);
OleDbCommand cmd100 = new OleDbCommand("select top 3 emails  from bulk_tbl", con100);
OleDbDataAdapter da100 = new OleDbDataAdapter(cmd100);
DataSet ds100 = new DataSet();
da100.Fill(ds100);

    for (int i = 0; i < ds100.Tables[0].Rows.Count; i++)
    //try
    {
        string all_emails = ds100.Tables[0].Rows[i][0].ToString();
        {
            string allmail = all_emails + ";";
            Session.Add("ad_emails",allmail);
            Response.Write(Session["ad_emails"]);
            send_mail();
        }
    }

并发送我使用的电子邮件：

and for sending the email I use:

string sendto = Session["ad_emails"].ToString();

MailMessage message = new MailMessage("[e-mail]", sendto, "subject", "body");
SmtpClient emailClient = new SmtpClient("mail.smtp.com");
System.Net.NetworkCredential SMTPUserInfo = new System.Net.NetworkCredential("abc", "abc");
emailClient.UseDefaultCredentials = true;
emailClient.Credentials = SMTPUserInfo;
emailClient.Send(message);

推荐答案

问题是您提供的地址列表用分号分隔成 MailMessage 构造函数，只需要一个代表单个地址的字符串：

The problem is that you are supplying a list of addresses separated by semi-colons to the MailMessage constructor when it only takes a string representing a single address:

包含电子邮件收件人地址的字符串。

A String that contains the address of the recipient of the e-mail message.

或者可能是由逗号（见下文）。

or possibly a list separated by commas (see below).

来源

要指定多个地址，您需要使用 To 属性，这是一个 MailAddressCollection ，虽然这些页面上的示例不能很清楚地显示：

To specify multiple addresses you need to use the To property which is a MailAddressCollection, though the examples on these pages don't show it very clearly:

message.To.Add("[e-mail], [e-mail]"));

要添加到MailAddressCollection的电子邮件地址。多个电子邮件地址必须用逗号分隔（，）。

The e-mail addresses to add to the MailAddressCollection. Multiple e-mail addresses must be separated with a comma character (",").

MSDN页面

所以创建 MailMessage 与逗号分隔列表应该可以工作。

so creating the MailMessage with a comma separated list should work.

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