在最后一行中,它会给出错误"年,月和日参数描述不可表示的日期时间。"当dr.item(" t $ ltdt")等于null时。
如何处理null DateTime并将它们转换为指定的DateTime?
Dim sqlCur As String = "SELECT * FROM baan.ttiitm001800 WHERE (t$kitm ='1' or t$kitm='4') " & ItemCondtion & " ORDER BY t$item"
Dim cmd As New OracleCommand(sqlCur, connBaan)
Dim dr As OracleDataReader = cmd.ExecuteReader()
If dr.HasRows Then
While dr.Read()
Dim ChkItmCd As String = "SELECT Item_Code FROM MPC_Item_Master WHERE Item_Code='" & Trim(dr.Item("t$item")) & "' "
db.OpenTable(ChkItmCd)
If db.Eof Then
ItmType = Trim(dr.Item("t$kitm"))
If (Trim(dr.Item("t$kitm")) = "1") Then
ItmType = "PURCHASED"
ElseIf (Trim(dr.Item("t$kitm")) = "4") Then
ItmType = "COST"
End If
Dim ltdt As Date = dr.Item("t$ltdt")
答案 0 :(得分:0)
您可能想要使用Convert.ToDateTime method。它采用多种格式并将其转换为DateTime。
另外,请确保您的输入不为空:
Dim ltdt As Date
If dr.Item("t$ltdt") IsNot Nothing Then
ltdt = Convert.ToDateTime(dr.Item("t$ltdt"))
End If