MessageBox的公共功能帮助 [英] Public Function Help with MessageBox

问题描述

有人可以帮助我理解为什么此功能不显示我的消息框吗?该功能除了

Can someone help me understand why this function doesn't show my message box? The function works all besides the

MessageBox.Show("Apple Mobile Device USB Driver = True", "My Application",
           MessageBoxButtons.OKCancel, MessageBoxIcon.Asterisk)

谢谢.

Public Function IsUserlandConnected()
        Dim forever As Boolean = True
        Dim USBName As String = String.Empty
        Dim USBSearcher As New ManagementObjectSearcher(
                  "root\CIMV2",
                  "SELECT * FROM Win32_PnPEntity WHERE Description = 'Apple Mobile Device USB Driver'")
        For Each queryObj As ManagementObject In USBSearcher.Get()
            USBName += (queryObj("Description"))
        Next
        If USBName = "Apple Mobile Device USB Driver" Then
            Return True
            MessageBox.Show("Apple Mobile Device USB Driver = True", "My Application",
           MessageBoxButtons.OKCancel, MessageBoxIcon.Asterisk)
        Else
            Return False
            MessageBox.Show("Apple Mobile Device USB Driver = False", "My Application",
           MessageBoxButtons.OKCancel, MessageBoxIcon.Asterisk)
        End If
    End Function

推荐答案

仍然无效吗?我尝试删除

Still doesn't work? I tried removing

Return True

和

Return False

但是它仍然不起作用..我也尝试了这个.

but it still doesn't work.. I also tried this.

Public Function IsUserlandConnected()
        Dim forever As Boolean = True
        Dim USBName As String = String.Empty
        Dim USBSearcher As New ManagementObjectSearcher(
                  "root\CIMV2",
                  "SELECT * FROM Win32_PnPEntity WHERE Description = 'Apple Mobile Device USB Driver'")
        For Each queryObj As ManagementObject In USBSearcher.Get()
            USBName += (queryObj("Description"))
        Next
        If USBName = "Apple Mobile Device USB Driver" Then
            Return True
            If IsUserlandConnected.Equals(True) Then
                MessageBox.Show("Apple Mobile Device USB Driver = True", "My Application",
           MessageBoxButtons.OKCancel, MessageBoxIcon.Asterisk)
            End If
        Else
            Return False
            If IsUserlandConnected.Equals(False) Then
                MessageBox.Show("Apple Mobile Device USB Driver = False", "My Application",
           MessageBoxButtons.OKCancel, MessageBoxIcon.Asterisk)
            End If
        End If
    End Function

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