我将如何创建交货日期通知器

Question

我想在交货的确切日期前30天通知，但我不知道如何处理。我正在使用datagridview来显示数据库中的数据。

我想创建一个倒计时，每天会通知我，直到确切的交货日期。

DateTime answer = today.AddDays(30);`enter code here` 
string convert1 = today.ToString("MM/dd/yy"); //Today's date 
string convert = answer.ToString("MM/dd/yy"); //Today + 30days 

sqlcon.Open(); 
command.Connection = sqlcon; 

command.CommandText = "SELECT [ID], [Delivery Date], [Delivery Time], [Delivery Description] From Delivery WHERE [Delivery Date] < '" + convert + "' ORDER BY [Delivery Date] ASC"; 
using (SqlDataReader reader = command.ExecuteReader()) 
{ 
    while (reader.Read()) 
    { 
     if (today.Date < answer.Date) 
     { 
      MessageBox.Show("Upcoming Delivery in less than 30 days!" + "\n\n*Delivery Date:\n" + "  " + reader["Delivery Date"].ToString() + "\n\n*Delivery Description:\n" + "  " + reader["Delivery Description"].ToString()); 
     } 
    } 
} 
sqlcon.Close(); 

Answer 1

您可以创建Windows服务，它将定期检查要通知的实体。 Topshelf（https://github.com/Topshelf/Topshelf）是一个正确的方式去与Windows服务。