Question

为什么此If声明无法识别Then并且只是说＆＃34;表达式预期＆＃34;在最后两个Then下有一个蓝色下划线，第一个很好。

If fst <> "" And lst = "" Then
    cmd = New OleDbCommand("SELECT * FROM Customers WHERE FirstName='" & fst & "';", cn)
ElseIf fst = "" And lst = <> Then
    cmd = New OleDbCommand("SELECT * FROM Customers WHERE Surname='" & lst & "';", cn)
ElseIf fst <> "" And lst = <> Then
    cmd = New OleDbCommand("SELECT * FROM Customers WHERE Surname='" & lst & "' AND FirstName='" & fst & "';", cn)
End If

Answer 1

If fst <> "" And lst = "" Then
    ' statement...
ElseIf fst = "" And lst = "" Then
    ' statement...
ElseIf fst <> "" And lst = "" Then
    ' statement...
End If

Answer 2

嗯，我在这里看到的主要错误是这一行，你的代码中有两次：

并且lst =＆lt;＆gt;表达然后 - ＆gt;错

并且lst＆lt;＆gt;表达然后 - ＆gt;正确

然后lst =表达式 - ＆gt;正确

为什么This If语句没有识别＆＃39;那么＆＃39;？

2 个答案: