VB.Net 嵌套 If

Question

我有一些逻辑，并且确定没有达到条件。我已经尝试了 if/ifelse/else 的几种变体来创建我想要的逻辑，但没有任何正确的工作。让我用一些代码告诉你...

If(a is true) Then
print("A is true")

Else If(b is true) Then
print("B is true")

    if(c is true) Then
    print("B and C are true")

    else 'c is Not true
    print("B is true, C is Not true)

        if(d is true) Then
        print("B and D are true")

        else 'd is Not true
        print("B is true, D is Not true")

        End If
   End If
End If

发生的事情是我的

"If(d is true)" 和 "else 'd is not true"

条件未检查。这部分逻辑是 "stepped over"

当 A、B、C 和 D 为真时的预期输出：

"A is true"

当 B、C 和 D 为真时的预期输出：

"B is true"

"B and C are True"

"B, C, and D are True"

当 B 和 C 为真但 D 不为真时的预期输出：

"B is true"

"B and C are True"

"B is true, D is not true"

当 B 和 D 为真时的预期结果：

"B is true"

"B is True, C is not true"

"B, and D are true"

我目前看到的：

B、C、D 为真：

"B is true"

"B and C are true"

其中省略了 "B and D are true"

希望这些结果能帮助您理解！

Answer 1

我不确定 a、b、c 或 d 是什么，但这是我认为您正在尝试做的。仅当 "d" 根据您的 "use case" 为真或假时，您才需要更改字符串。如果您想要更细粒度，那么我建议使用前面提到的字符串生成器。无论如何，这是我用来创建您的 "case" 的代码要清楚，如果 "b" 为假，则永远不会检查 "c" 和 "d"。我是根据你的 "use case" 陈述的。

 Private Sub Test()
            Dim a = True
            Dim b = False
            Dim c = True
            Dim d = True

            Dim printout As String = ""
            If a Then
                printout = "a is true"
            Else
                If b Then
                    If c Then
                        printout = "b and c are true"
                    else
                      printout="b is true and c is not true"

                    End If
                    If d and c Then
                        printout = "b and c and d are true"

                    elseif d=true and c=false then

                        printout = "b and d are true , c is not true"
                    elseif c=true and  d=false then
                     printout = "b and c is true ,d is not true"  
                    else
                     printout = "b is true ,c and d are not true"              


                    End If
                End If
            End If
            Console.WriteLine(printout)

        End Sub

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