小编Ank*_*pta的帖子

我尝试使用gmail发送邮件,我得到一个例外 The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Must issue a STARTTLS command first. i16sm1806350pag.18 - gsmtp

我写的用于发送邮件的代码是

MailMessage mail = new MailMessage(); 
mail.To.Add(txtEmail.Text.Trim()); 
mail.To.Add("Secondry@gmail.com");
mail.From = new MailAddress("mysendingmail@gmail.com");
mail.Subject = "Confirmation of Registration on Job Junction.";
string Body = "Hi, this mail is to test sending mail using Gmail in ASP.NET";
mail.Body = Body;
mail.IsBodyHtml = true;
SmtpClient smtp = new SmtpClient("smtp.gmail.com", 587);
// smtp.Host = "smtp.gmail.com"; //Or …

我有一个表 Emp 其中有这样的记录

Id     Name
1      A
2      B
3      C
1      A
1      A
2      B
3      C

现在我想从表中删除重复行我正在使用此查询来选择或计算重复记录的数量

SELECT NameCol, COUNT(*) as TotalCount FROM TestTable 
GROUP BY NameCol HAVING COUNT(*) > 1 
ORDER BY COUNT(*) DESC

我应该编写什么查询来删除表中的重复行。

如果我编写此查询来删除重复记录，那么它会给出结果(0) row Affected。

`DELETE FROM TestTable 
    WHERE ID NOT IN ( SELECT MAX(ID) FROM 
                                     TestTable 
                                     GROUP BY NameCol
                    )`

我在 MVC 控制器中有一个动作

public ActionResult ExportExcel(string ReportType,DateTime? FromDate,DateTime? ToDate)
{
     var query = UnitOfWork.RepoTestResAnalysis.GetAll();
     var QueryData = query.Where(s => s.MSO == ms && (FromDate != null && (s.TEST_DATE.Value >= FromDate)) && (ToDate!=null && (s.TEST_DATE.Value<=ToDate))).ToList();
}

现在如果FromDate和ToDate为空，那么我得到QueryData计数为零。但我需要所有记录。所以谁能告诉我我怎样才能得到预期的结果。虽然FromDate&ToDate有价值，那么我得到了预期的结果。