C# DataReader不返回任何行，但数据存在

我试图每月获得报警统计数据。这是我的SQL语句

SELECT datepart(year,incidentDate),datepart(month,incidentDate) ,COUNT(*) AS CNT 
From alarm_actions,alarm_licenses 
where licType = 'AR' and alarm_actions.alarmNo = ALARM_LICENSES.alarmNo and alarmCount > 0 and
ignoreAlarm = 0 and incidentDate between '5/1/12' and '7/31/14'
group by datepart(year,incidentDate) , datepart(month,incidentdate)
order by datepart(year,incidentDate)

当我在SQL2008R2中执行这个查询时，我得到27行，但是当我在VisualStudio中使用SqlDataReader时，我没有得到任何数据。chartFrom和chartTo是我用来获取日期的文本框

string alarmCount = ("Select datepart(year,incidentDate) , datepart(month,incidentDate),COUNT(*) as cnt From Alarm_Actions,Alarm_Licenses Where licType = 'AR' and alarm_actions.alarmNo = alarm_licenses.alarmNo and alarmCount > 0 and ignoreAlarm = 0 and incidentDate between " + chartFromDate + " and " + chartToDate + "group by DATEPART(YEAR, incidentDate), DATEPART(MONTH,incidentDate) order by  DATEPART(YEAR, incidentDate)");
SqlDataReader dr = data.myDataReader(alarmCount);
while(dr.Read())
{
   //Do something
}

下面是myDataReader的代码

 public SqlDataReader myDataReader(string mSQL) 
    {
        SqlConnection myConnection = new SqlConnection(connectionString);
        SqlDataReader myReader;
        SqlCommand myCommand1;
        try
        {
            myConnection.Open();
            //myCommand1 = new System.Data.OleDb.OleDbCommand(mSQL, myConnection);
            myCommand1 = new SqlCommand(mSQL, myConnection);

            //=============== 1/26/2012 =============
            //There have been errors running recently. I am increasing the timeout here
            myCommand1.CommandTimeout = 60000;

            myReader = myCommand1.ExecuteReader(CommandBehavior.CloseConnection);
            //return myReader;
        }
        catch (Exception e1)
        {
           MessageBox.Show("An error occurred retrieving the requested data\r\n\r\n" + mSQL + "\r\n\r\n" + e1.Message);
            myReader = null;
            try
            {
                string mSentBy = ConfigurationManager.AppSettings["emailSentBy"].ToString();
                string mSendTo1 = ConfigurationManager.AppSettings["emailSendTo"].ToString();
                string mSubject = ConfigurationManager.AppSettings["emailSubject"].ToString();
                string mHost = ConfigurationManager.AppSettings["emailHost"].ToString();
                string mSignon = ConfigurationManager.AppSettings["emailSignon"].ToString();
                string mPassword = ConfigurationManager.AppSettings["emailPassword"].ToString();
            }
            catch { }
        }
        finally
        {
            //myConnection.Close();
            myCommand1 = null;
            //myReader = null;
            myConnection = null;
            //myReader = null;
        }
        return myReader;
    }

谢谢你帮助我

---

我在日期字段中缺少了。感谢大家花时间帮助

我没有测试它，但我希望它对您有用：

SqlConnection con = new SqlConnection(connectionString);  

SqlCommand cmd = new SqlCommand();  
cmd.Connection = con;  
cmd.CommandText = "SELECT datepart(year,incidentDate), ......";  

con.Open();  

cmd.ExecuteNonQuery();  

SqlDataReader dr = cmd.ExecuteReader();

while(dr.Read())
{
   //Do something
}

con.Close();  

---

你有什么例外吗？请发布整个代码、创建Sql连接的方式、创建命令和执行命令等。请发布

myDataReader（）

函数的代码。可能与您的问题无关，但是，最好指定日期格式，而不是进行隐式转换。您是否也可以在代码中发布查询的外观，以便我们查看这是否与格式问题有关？我刚刚更新了它。ChartFromDate和ChartToDate是我用来获取日期的文本框。我输入了与上述查询相同的日期