C# 如何从mysql查询中存储对象max（date）和min（date）

我是C#的新手，从未存储过mysql查询中的对象。我声明了2个Datetimes变量：

DateTime date_min
DateTime date_max

我想从下面的查询中存储最大（日期）和最小（日期）

string query1 = "SELECT MIN(order_status.BEGIN_DATE) AS 'BEGIN DATE', MAX(order_status.END_DATE) AS 'END DATE' FROM project1.order_status INNER JOIN project1.orders ON orders.ID_ORDER = order_status.ID_ORDER WHERE orders.NUMBER_ORDER = 'TEST';";

比如：

max（日期）=max（订单状态.结束日期）

我想在这个循环中使用它：

    for (DateTime date = date_min; date <= date_max; date = date.AddDays(1))
    {             
        string query2 = "SELECT COUNT(leave.ID_PRACOWNIKA) AS 'NUMBER OF WORKERS ON LEAVE' FROM project1.leave WHERE DATE(leave.BEGIN_DATE) <= '"+date+"' AND DATE(leave.END_DATE) >= '"+date+"';";
        string query3 = "SELECT TIME_FORMAT(SEC_TO_TIME(SUM(TIME_TO_SEC(order_status.END_DATE) - TIME_TO_SEC(order_status.BEGIN_DATE))), '%H:%i:%s') AS 'TIME OF ALL ORDERS IN DAY' FROM project1.order_status INNER JOIN project1.orders ON orders.ID_ORDER = order_status.ID_ORDER WHERE (DATE(order_status.BEGIN_DATE) = '"+date+"' AND DATE(order_status.END_DATE) = '"+date+"');";
        string query4 = "SELECT TIME_FORMAT(SEC_TO_TIME(SUM(TIME_TO_SEC(order_status.END_DATE) - TIME_TO_SEC(order_status.BEGIN_DATE))), '%H:%i:%s') AS 'TIME OF ORDER IN DAY' FROM project1.order_status INNER JOIN project1.orders ON orders.ID_ORDER  = order_status.ID_ORDER WHERE (DATE(order_status.BEGIN_DATE) = '"+date+"' AND DATE(order_status.END_DATE) = '"+date+"') AND orders.NUMBER_ORDER = 'TEST';";
    }

for（DateTime-date=date\u-min；date可用于检索以下值

using (MySqlConnection connection = new MySqlConnection(connectionString))
{
using(var command = new MySqlCommand(query1, con))
{
    using(var reader = command.ExecuteReader())
    {
       while (reader.Read())
       {
        date_min = Convert.ToDateTime(reader[0]);
        date_max = Convert.ToDateTime(reader[1]);
       }
    }
}
}

希望有帮助。
您可以使用以下方法检索值

using (MySqlConnection connection = new MySqlConnection(connectionString))
{
using(var command = new MySqlCommand(query1, con))
{
    using(var reader = command.ExecuteReader())
    {
       while (reader.Read())
       {
        date_min = Convert.ToDateTime(reader[0]);
        date_max = Convert.ToDateTime(reader[1]);
       }
    }
}
}

希望能有所帮助。
好的，但是你写的这个我应该添加到我的代码中还是在我的代码之后？好的，但是你写的这个我应该添加到我的代码中还是在我的代码之后？
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
using(var command = new MySqlCommand(query1, con))
{
    using(var reader = command.ExecuteReader())
    {
       while (reader.Read())
       {
        date_min = Convert.ToDateTime(reader[0]);
        date_max = Convert.ToDateTime(reader[1]);
       }
    }
}
}