如果语句在PowerShell脚本中的else语句中调用了两次

Question

我正在尝试执行以下代码的PowerShell脚本：

    function Invoke-InstallationOfANewBuild() {   
    param (
           $PathToTheLocalFolderWhereBuildsAreHeld = "$($env:USERPROFILE)\Desktop\",
           $PlaceOnANetworkDriveWhereBuildsAreHeld = "\\r\P\Al\OSystem\D B\20\x64"
           )
    begin  { 
            Write-Verbose -Message "Searching for a build with the biggest CL number a in build name in local folder." -Verbose    
            $CheckClNumberOfABuildOnADesktop = Get-ChildItem $PathToTheLocalFolderWhereBuildsAreHeld -Filter *.exe | Where-Object Name -Like '*OSystemInstaller_20*' | ForEach-Object {
                New-Object psobject -Property @{
                No = [int]([regex]::Match($_.Name, '(?<=CL)\d+').Value)
                Name = $_.FullName 
            } 
            } | Sort-Object No -Descending | Select-Object -ExpandProperty Name -First 1

            Write-Verbose -Message "Searching for a build with the biggest CL number in a build name on a network drive." -Verbose
            $CheckClNumberOfABuildOnANetworkDrive = Get-ChildItem $PlaceOnANetworkDriveWhereBuildsAreHeld -Filter *.exe | Where-Object Name -NotMatch '.*NoDB\.exe$' | ForEach-Object {
                New-Object psobject -Property @{
                No = [int]([regex]::Match($_.Name, '(?<=CL)\d+').Value)
                Name = $_.FullName 
            }
            } | Sort-Object No -Descending | Select-Object -ExpandProperty Name -First 1

                Write-Verbose -Message "Comparison of two hash sums. Please, wait." -Verbose

            if ($CheckClNumberOfABuildOnADesktop)
             {
                $GetHashOfFileWhichIsPlacedOnDesktop = Get-MyFileHash $CheckClNumberOfABuildOnADesktop -Algorithm MD5
                $GetHashOfFileWhichIsPlacedOnNetworkDrive = Get-MyFileHash $CheckClNumberOfABuildOnANetworkDrive -Algorithm MD5

             }
            else {
                Write-Verbose -Message "There are no O System 20-1 (dev branch) builds in specified local folder. Extracting hash of the newest build in the network folder..." -Verbose
                $GetHashOfFileWhichIsPlacedOnNetworkDrive = Get-MyFileHash $CheckClNumberOfABuildOnANetworkDrive -Algorithm MD5

             }

            if ($GetHashOfFileWhichIsPlacedOnDesktop.MD5 -ne $GetHashOfFileWhichIsPlacedOnNetworkDrive.MD5)
                   {
                     Write-Verbose -Message "Hash sum of a file which is placed on the desktop and file in the network drive are different or there is no O System 20-1 build in specified local folder. The newest build will be copied from the network folder to to the local folder." -Verbose
                   }
            else {
                     Write-Verbose -Message "Hash sum of a file which is placed on the desktop and a file on the network drive are the same. No need to copy anything." -Verbose
                 }
            }
       process { 

           if ($GetHashOfFileWhichIsPlacedOnDesktop.MD5 -eq $GetHashOfFileWhichIsPlacedOnNetworkDrive.MD5){ 
                    Write-Verbose -Message "Installation... Please, wait." -Verbose

            Get-ChildItem $PathToTheLocalFolderWhereBuildsAreHeld -Filter *.exe | Where-Object Name -Like '*OSystemInstaller_20*' | ForEach-Object {
            New-Object psobject -Property @{
            No = [int]([regex]::Match($_.Name, '(?<=CL)\d+').Value)
            Name = $_.FullName
            }
            } | Sort-Object No -Descending | Select-Object -ExpandProperty Name -First 1 | ForEach-Object { & $_ -s2 -sp"-SilentInstallation=standalone -UpdateMaterials=yestoall -UpgradeDBIfRequired=yes"}             
        }          

            else {
                    Write-Verbose -Message "The newest build doesn't exist in specified folder. Downloading, please wait." -Verbose

            $SelectTheNewestBuildInFolder = Get-ChildItem  $PlaceOnANetworkDriveWhereBuildsAreHeld -Filter *.exe | Where-Object Name -NotMatch '.*NoDB\.exe$' | ForEach-Object {
            New-Object psobject -Property @{
            No = [int]([regex]::Match($_.Name, '(?<=CL)\d+').Value)
            Name = $_.FullName 
            }
            } | Sort-Object No -Descending | Select-Object -ExpandProperty Name -First 1 | Copy-Item -Destination $PathToTheLocalFolderWhereBuildsAreHeld
            }

            $HashNumberOfCopiedBuild = Get-MyFileHash $SelectTheNewestBuildInFolder -Algorithm MD5

            if ($HashNumberOfCopiedBuild.MD5 -eq $GetHashOfFileWhichIsPlacedOnNetworkDrive.MD5) {
                Write-Verbose -Message "Hash sum of the copied file and hash sum of original file are the same. Builds are the same." -Verbose

                Write-Verbose -Message "Installation... Please, wait." -Verbose

            Get-ChildItem $PathToTheLocalFolderWhereBuildsAreHeld -Filter *.exe | Where-Object Name -Like '*OSystemInstaller*' | ForEach-Object {
            New-Object psobject -Property @{
            No = [int]([regex]::Match($_.Name, '(?<=CL)\d+').Value)
            Name = $_.FullName
            }
            } | Sort-Object No -Descending | Select-Object -ExpandProperty Name -First 1 | ForEach-Object {& $_ -s2 -sp"-SilentInstallation=standalone -UpdateMaterials=yestoall -UpgradeDBIfRequired=yes"}     
            }
            else {
                Write-Verbose -Message "Hash sum of the copied file and hash sum of original file are different. Builds are the same." -Verbose
                 } # [Block moved]
             }     
        }     
             Invoke-InstallationOfANewBuild

但是最后一个else语句中的if语句工作两次（因此安装过程被调用两次）。如何将if语句放在else语句中，以便只调用一次？实施例

1）如果true中的值为else而不是执行安装并停止脚本 2）如果false中的值为else，则移至if中的else并从那里执行安装。

Answer 1

process { 
if ($GetHashOfFileWhichIsPlacedOnDesktop.MD5 -ne $GetHashOfFileWhichIsPlacedOnNetworkDrive.MD5) { 

    Get-ChildItem  $PlaceOnANetworkDriveWhereBuildsAreHeld -Filter *.exe | Where-Object Name -NotMatch '.*NoDB\.exe$' | ForEach-Object {
        New-Object psobject -Property @{
            No   = [int]([regex]::Match($_.Name, '(?<=CL)\d+').Value)
            Name = $_.FullName 
        }
    } | Sort-Object No -Descending | Select-Object -ExpandProperty Name -First 1 | Copy-Item -Destination $PathToTheLocalFolderWhereBuildsAreHeld
}          
$CheckClNumberOfABuildOnADesktop = Get-ChildItem  $PathToTheLocalFolderWhereBuildsAreHeld -Filter *.exe | Where-Object Name -NotMatch '.*NoDB\.exe$' | ForEach-Object {
    New-Object psobject -Property @{
        No   = [int]([regex]::Match($_.Name, '(?<=CL)\d+').Value)
        Name = $_.FullName 
    }
} | Sort-Object No -Descending | Select-Object -ExpandProperty Name -First 1 

$HashNumberOfTheCopiedBuild = Get-MyFileHash $CheckClNumberOfABuildOnADesktop -Algorithm MD5

if ($HashNumberOfTheCopiedBuild.MD5 -eq $GetHashOfFileWhichIsPlacedOnNetworkDrive.MD5) {

    Write-Verbose -Message "Installation... Please, wait." -Verbose

    Get-ChildItem $PathToTheLocalFolderWhereBuildsAreHeld -Filter *.exe | Where-Object Name -Like '*OrthoSystemInstaller*' | ForEach-Object {
        New-Object psobject -Property @{
            No   = [int]([regex]::Match($_.Name, '(?<=CL)\d+').Value)
            Name = $_.FullName
        }
    } | Sort-Object No -Descending | Select-Object -ExpandProperty Name -First 1 | ForEach-Object {& $_ -s2 -sp"-SilentInstallation=standalone -UpdateMaterials=yestoall -UpgradeDBIfRequired=yes"}     
}
else {
    Write-Verbose -Message "H" -Verbose
  }
 }     
}

我所做的一切 - 从第一个if移除安装并放到第二个if。