Question

我正在调用DataContext对象的ExecuteQuery方法。我希望每行都有一个String和一个Integer，但是当我运行ToList函数时，我的所有值都不是0。我的所有结果应该是不同的字符串和数字。如果我直接运行它，我的查询运行完美，但ExecuteQuery返回垃圾而不是有效结果。造成这种情况的原因是什么？

提前谢谢。

编辑：

public function something as List(of Pair(of String, Integer))
            Dim c As TTDataContext = ContextFactory.CreateDataContext()
            Dim startValueLen = CStr(StartValue).Length
            Dim query As String = "select top " & CStr(Limit) & " case " &
                                                                   " when WONum like '0000%' then SUBSTRING(WONum, 5, Len(WONum) - 4) " &
                                                                   " when WONum like '000%' then SUBSTRING(WONum, 4, Len(WONum) - 3) " &
                                                                   " when WONum like '00%' then SUBSTRING(WONum, 3, Len(WONum) - 2) " &
                                                                   " when WONum like '0%' then SUBSTRING(WONum, 2, Len(WONum) - 1) " &
                                                                   " else WONum " &
                                                                   " end as retVal, " &
                                                                   " case " &
                                                                   " when WONum like '0000%' then 1 " &
                                                                   " when WONum like '000%' then 2 " &
                                                                   " when WONum like '00%' then 3 " &
                                                                   " when WONum like '0%' then 4 " &
                                                                   " else LEN(WONum) " &
                                                                   " end as retLen " &
                                                                   " from TblWorkOrder " &
                                                                   " where CompanyID = " & CStr(CompanyID) & " and LEN(WONum) >= " & CStr(startValueLen) & " and (WONum > '" & CStr(StartValue) & "' or LEN(WONum) > " & CStr(startValueLen) & ") " &
                                                                   " order by retLen, retVal"
            Dim temp = c.ExecuteQuery(Of Pair(Of String, Integer))(query)
            Return temp.ToList
End Function

Answer 1

问题的原因是我的Pair类有一个First和Second属性，我没有将结果作为First和second返回。因此问题的解决方案是将第一个值作为First返回，将第二个值作为Second返回，而不是retVal和retLen。

ASP.NET DataContext问题

1 个答案: