Question

我正在尝试使用System.Net.Mail.SmtpClient类发送电子邮件asp.net。

但是我收到以下异常消息：

The parameter 'addresses' cannot be an empty string.
     Parameter name: addresses

这是我的发送电子邮件代码：

    private void SendEmailUsingGmail(string toEmailAddress)
    {
        try
        {
            SmtpClient smtp = new SmtpClient();
            smtp.Credentials = new NetworkCredential("keysketyyyy@gmail.com", 
             "sdsdasd");
            smtp.Port = 587;
            smtp.Host = "smtp.gmail.com";
            smtp.EnableSsl = true;
            MailMessage message = new MailMessage();
            message.From = new MailAddress("keysketyyy@gmail.com");
            message.To.Add(toEmailAddress);
            message.Subject = "Write your email subject here";
            message.Body = "write the content of the email here";
            smtp.Send(message);
        }
        catch (Exception ex)
        {
            Response.Write("Error occured: " + ex.Message.ToString());
        }
    }

异常被捕获在SendEmailUsingGmail catch块中。

这是主叫代码：

protected void Button1_Click(object sender, EventArgs e)
{            
   string connStr = ConfigurationManager.ConnectionStrings["mydms"].ConnectionString;
   SqlConnection mySQLconnection = new SqlConnection(connStr);
   if (mySQLconnection.State == ConnectionState.Closed)
   {
       mySQLconnection.Open();
       for (int i = 0; i < Repeater2.Items.Count; i++)
       {
           DropDownList DropDownListcontrol = ((DropDownList)Repeater2.Items[i].FindControl("DropDownList4"));
           Label DocId = ((Label)Repeater2.Items[i].FindControl("DocId"));

           SqlCommand cmd = new SqlCommand("approveddd", mySQLconnection);
           cmd.CommandType = CommandType.StoredProcedure;

           cmd.Parameters.Add("@DocID", SqlDbType.Int).Value = Convert.ToInt32((DocId.Text));

           cmd.Parameters.Add("@ApproveID", SqlDbType.Int).Value = Convert.ToInt32(DropDownListcontrol.SelectedValue);
           cmd.Parameters.Add("@ApproveBy", SqlDbType.VarChar, 50).Value = (Session["Login2"]);
            try
            {
                cmd.ExecuteNonQuery();
                string emailId = ((Label)Repeater2.Items[i].FindControl("Label2")).Text;
                SendEmailUsingGmail(emailId);
             }
             catch (Exception ex)
             {
                 Supvisor.Text=(ex.Message);
             }
             cmd.ExecuteNonQuery();
             //UPDATE APPPROVEID IN DOCUMENTINFO TABLE
             //DMSLIB.Doc myDoc = new DMSLIB.Doc();
             //myDoc.MarkDocAs(Convert.ToInt16(DocId.Text), 
             Convert.ToInt32(DropDownListcontrol.SelectedValue));
        }

    }
    else
    {
         Supvisor.Text = "Error";
    }
    if (mySQLconnection.State == ConnectionState.Open)
    {
         mySQLconnection.Close();
    }
 }

当管理员批准/拒绝文档时，数据会像这样保存到数据库中

SeqNo   DocID   ApproveID   ApproveBy
82      20      3           john
83      21      1           john
84      18      2           kety
85      19      1           emel

现在我也发送电子邮件当管理员点击按钮然后电子邮件发送到相应的电子邮件ID 像这样我在转发表中显示

 DocID  DocName Uplaodedfile    UserEmail           DocType DepType ApproveID
 1      ABC     def.pdf         abcdef@gmail.com    pdf     hr      (In this i set dropdown values are (approve/reject/pending)

Answer 1

尝试

message.To.Add(New MailAddress(toEmailAddress));

并验证变量“toEmailAddress”的内容。

Answer 2

此异常表示您尝试将空字符串添加为电子邮件地址。哪个无效。在这种情况下，它意味着toEmailAddress是一个空字符串。

参数'addresses'不能是空字符串

2 个答案: