菜单选择不按选择返回

Question

我在下面的简单代码中用脚本显示菜单

        Write-Host "============= Main Category ================================="
            Write-Host " '1' InfoBlox"
            Write-Host " '2' Installation"
            Write-Host " '3' Active Directory"
            Write-Host " '4' LogInventory"
            Write-Host " '5' Configuration"
            Write-Host " '6' New Server Build CMDB Update "
            Write-Host " '7' for Exit"
        Write-Host "========================================================"
        $choice = Read-Host "`nEnter Choice"

if($choice -eq '1')
{
#Menu for choice 
    cls
    Write-Host "=============InfoBlox================================="
    Write-Host " '1' Add CNAME record"
    Write-Host " '2' Delete CNAME record"
    Write-Host " '3' Add A-record and PTR record"
    Write-Host " '4' Delete A-record and PTR record"
    Write-Host " '5' for Main Menu"
    Write-Host "========================================================"
    $subchoice = Read-Host "`nEnter Choice"
#code here
  if($subchoice -eq '5')
        {
        cls
        Write-Host "============= Main Category ================================="
            Write-Host " '1' InfoBlox"
            Write-Host " '2' Installation"
            Write-Host " '3' Active Directory"
            Write-Host " '4' LogInventory"
            Write-Host " '5' Configuration"
            Write-Host " '6' New Server Build CMDB Update "
            Write-Host " '7' for Exit"
        Write-Host "========================================================"
        $choice = Read-Host "`nEnter Choice"
}
if($choice -eq '2')
{
 #code here
}
if($choice -eq '3')
{
 #code here

}

我面临的问题是，当我第一次执行的时候，它运行的很好。例如，当我选择**1，2，3.**时很好，但是当我再次作为选择从3返回到1时，脚本将退出并显示powershell提示符。

请让我知道为什么会发生这种事。我可能无法恰当地解释。如果有什么问题请告诉我。

Answer 1

Mathias R. Jessen在他的有用注释中给出了指针，每个菜单/选项都应该有自己的函数或脚本块，逻辑应该封装在一个无限循环中，在选择Exit选项时结束。

为了演示目的，我减少了代码。

function Menu {
    Write-Host " '1' Option 1"
    Write-Host " '2' Option 2"
    Write-Host " '3' for Exit"
}

function SelectSomething {
    Read-Host "`nEnter Choice"
}

function FirstOption {
    Write-Host " '1' Add CNAME record"
    Write-Host " '2' Delete CNAME record"
    Write-Host " '3' for Main Menu"
    SelectSomething
}

function SecondOption {
    Write-Host " '1' InfoBlox"
    Write-Host " '2' Installation"
    Write-Host " '3' for Main Menu"
    SelectSomething
}

$firstScriptblock = {
    switch(FirstOption) {
        1 { 'Option 1 - Add CNAME record' }
        2 { 'Option 2 - Delete CNAME record' }
        3 { return }
        Default { Write-Warning 'Invalid Selection' }
    }
    $Host.UI.ReadLine()
    & $MyInvocation.MyCommand.ScriptBlock
}

$secondOption = {
    Write-Warning 'Not implemented! Back to Menu'
    $Host.UI.ReadLine()
}

:outer while($true) {
    Clear-Host
    Menu
    switch(SelectSomething) {
        1 { & $firstScriptblock }
        2 { & $secondOption }
        3 { break outer }
        Default { Write-Warning 'Invalid Selection' }
    }
}