查詢可在sql Studio上運行，但不適用於C＃

Question

我有這個查詢，當我在Sql Studio上執行它時得到結果：

select TeamName, count(*) 
  from NetHoz_Decision
  inner join NetHoz_Case on NetHoz_Decision.CaseDisplayIdentifier = NetHoz_Case.CaseDisplayIdentifier 
  inner join maintik on MainTik.Counter = NetHoz_Case.TikCounter
  inner join Teams on MainTik.TeamCounter = Teams.Counter
  where NetHoz_Decision.DecisionStatusChangeDate between '2015-07-23' and '2015-07-28'
  group by TeamName

但是，當我在C＃SqlCommand上執行它時，我沒有得到任何結果。 dataSet為空，我沒有收到任何錯誤。 我以為問題可能是過時的。 我可以正確轉換嗎？

String date1 = String.Format("{0:yyyy-MM-dd}", dateTimePicker1.Value);
String date2 = String.Format("{0:yyyy-MM-dd}", dateTimePicker2.Value.AddDays(1));

Answer 1

使用SqlCommand和類型安全的參數

const string query = "
select TeamName, count(*) 
 from NetHoz_Decision
 inner join NetHoz_Case on NetHoz_Decision.CaseDisplayIdentifier = NetHoz_Case.CaseDisplayIdentifier 
 inner join maintik on MainTik.Counter = NetHoz_Case.TikCounter
 inner join Teams on MainTik.TeamCounter = Teams.Counter
 where NetHoz_Decision.DecisionStatusChangeDate between @from and @to
 group by TeamName
";

SqlCommand command = new SqlCommand(query);
command.Parameters.AddWithValue("@from", dateTimePicker1.Value);
command.Parameters.AddWithValue("@to", dateTimePicker2.Value.AddDays(1));